C# 如何获得年/月/周/日两个日期之间的差异？
如何有效地获得年/月/周/日两个日期之间的差异 两个日期之间的差异是1年、2个月、3周、4天C# 如何获得年/月/周/日两个日期之间的差异？,c#,.net,datetime,C#,.net,Datetime,如何有效地获得年/月/周/日两个日期之间的差异 两个日期之间的差异是1年、2个月、3周、4天 差值表示两个日期之间的年、月、周和日的计数。如果减去两个DateTime实例，将返回，表示两个日期之间的差异。使用DateTime对象的Subtract方法，该对象返回TimeSpan DateTime dt1 = new DateTime(2009, 3, 14); DateTime dt2 = new DateTime(2008, 3, 15); TimeSpan ts = dt1.Subtrac
差值表示两个日期之间的年、月、周和日的计数。如果减去两个
DateTime实例，DateTimeSubtractTimeSpanDateTime dt1 = new DateTime(2009, 3, 14);
DateTime dt2 = new DateTime(2008, 3, 15);
TimeSpan ts = dt1.Subtract(dt2);
Double days = ts.TotalDays;
Double hours = ts.TotalHours;
Double years = ts.TotalDays / 365;
减去两个
DateTimeDaysTimeSpan有很多边缘情况需要考虑，例如，2005年至03-01年是从2004年到03-01年，以及从2004年到02-29，取决于你所说的“年”。 < P>闰年和不均匀月实际上使这成为一个非平凡的问题。我相信有人能想出一个更有效的方法，但这里有一个选择-先在小的方面进行近似，然后进行调整（未经测试）：
public static void GetDifference（DateTime date1、DateTime date2、out int Years、，
out int月、out int周、out int天）
{
//为简单起见，假设date2是较大的日期
//年头
TimeSpan diff=date2-date1；
年=不同天数/366；
DateTime workingDate=date1.AddYears（年）；
while（workingDate.AddYears（1）这实际上相当棘手。不同的总天数可能会导致相同的结果。例如：
- 2008年6月19日至2010年6月19日=2年，但也包括365*2天
- 2006年6月19日至2008年6月19日=2年，但由于闰年，也有365+366天
你可能想减去年，直到你有两个相隔不到一年的日期，然后减去月，直到你有两个相隔不到一个月的日期
进一步的困惑：当你可能从“3月30日”开始的时候，减去（或加上）个月是很棘手的——比这个月早多少个月
更进一步的困惑（可能与此无关）：即使是一天也不总是24小时。有人使用夏令时吗
更进一步的困惑（几乎肯定不相关）：即使一分钟也不总是60秒。闰秒是非常令人困惑的
我现在没有时间想出正确的方法来做这件事——这个答案主要是为了提出一个事实，那就是它并不像听起来那么简单
编辑：很遗憾，我没有足够的时间完整回答这个问题。我建议您首先定义一个表示句点的结构：
public struct Period
{
private readonly int days;
public int Days { get { return days; } }
private readonly int months;
public int Months { get { return months; } }
private readonly int years;
public int Years { get { return years; } }
public Period(int years, int months, int days)
{
this.years = years;
this.months = months;
this.days = days;
}
public Period WithDays(int newDays)
{
return new Period(years, months, newDays);
}
public Period WithMonths(int newMonths)
{
return new Period(years, newMonths, days);
}
public Period WithYears(int newYears)
{
return new Period(newYears, months, days);
}
public static DateTime operator +(DateTime date, Period period)
{
// TODO: Implement this!
}
public static Period Difference(DateTime first, DateTime second)
{
// TODO: Implement this!
}
}
我建议您首先实现+运算符，它应该通知差异
方法-您应该确保所有第一个值的第一个+（Period.Difference（first，second））==second
从编写一系列单元测试开始——最初是“简单”的案例，然后转到涉及闰年的棘手案例。我知道通常的方法是一次编写一个测试，但在开始任何实现工作之前，我个人会头脑风暴一堆测试
给自己一天的时间来正确地实施这一点。这是很棘手的事情
请注意，我在这里省略了周数-该值至少很容易，因为它总是7天。因此，给定一个（正）周期，您将有：
int years = period.Years;
int months = period.Months;
int weeks = period.Days / 7;
int daysWithinWeek = period.Days % 7;
（我建议您甚至避免考虑负周期-确保所有事情始终是正的。）使用System.Data.Linq
命名空间及其SqlMethods.DateDiffMonth
方法如何
比如说：
DateTime starDT = {01-Jul-2009 12:00:00 AM}
DateTime endDT = {01-Nov-2009 12:00:00 AM}
然后：
=>4
在SqlMethods
类中还有其他DateDiff
静态方法。要正确计算年/月/周的差异，必须考虑文化信息的日历：
- 闰年与非闰年
- 具有不同天数计数的月份
- 周数不同的年份（根据周的第一天和日历周规则变化）
DateDiff的等级考虑了所有这些因素：
// ----------------------------------------------------------------------
public void DateDiffSample()
{
DateTime date1 = new DateTime( 2009, 11, 8, 7, 13, 59 );
Console.WriteLine( "Date1: {0}", date1 );
// > Date1: 08.11.2009 07:13:59
DateTime date2 = new DateTime( 2011, 3, 20, 19, 55, 28 );
Console.WriteLine( "Date2: {0}", date2 );
// > Date2: 20.03.2011 19:55:28
DateDiff dateDiff = new DateDiff( date1, date2 );
// differences
Console.WriteLine( "DateDiff.Years: {0}", dateDiff.Years );
// > DateDiff.Years: 1
Console.WriteLine( "DateDiff.Quarters: {0}", dateDiff.Quarters );
// > DateDiff.Quarters: 5
Console.WriteLine( "DateDiff.Months: {0}", dateDiff.Months );
// > DateDiff.Months: 16
Console.WriteLine( "DateDiff.Weeks: {0}", dateDiff.Weeks );
// > DateDiff.Weeks: 70
Console.WriteLine( "DateDiff.Days: {0}", dateDiff.Days );
// > DateDiff.Days: 497
Console.WriteLine( "DateDiff.Weekdays: {0}", dateDiff.Weekdays );
// > DateDiff.Weekdays: 71
Console.WriteLine( "DateDiff.Hours: {0}", dateDiff.Hours );
// > DateDiff.Hours: 11940
Console.WriteLine( "DateDiff.Minutes: {0}", dateDiff.Minutes );
// > DateDiff.Minutes: 716441
Console.WriteLine( "DateDiff.Seconds: {0}", dateDiff.Seconds );
// > DateDiff.Seconds: 42986489
// elapsed
Console.WriteLine( "DateDiff.ElapsedYears: {0}", dateDiff.ElapsedYears );
// > DateDiff.ElapsedYears: 1
Console.WriteLine( "DateDiff.ElapsedMonths: {0}", dateDiff.ElapsedMonths );
// > DateDiff.ElapsedMonths: 4
Console.WriteLine( "DateDiff.ElapsedDays: {0}", dateDiff.ElapsedDays );
// > DateDiff.ElapsedDays: 12
Console.WriteLine( "DateDiff.ElapsedHours: {0}", dateDiff.ElapsedHours );
// > DateDiff.ElapsedHours: 12
Console.WriteLine( "DateDiff.ElapsedMinutes: {0}", dateDiff.ElapsedMinutes );
// > DateDiff.ElapsedMinutes: 41
Console.WriteLine( "DateDiff.ElapsedSeconds: {0}", dateDiff.ElapsedSeconds );
// > DateDiff.ElapsedSeconds: 29
// description
Console.WriteLine( "DateDiff.GetDescription(1): {0}", dateDiff.GetDescription( 1 ) );
// > DateDiff.GetDescription(1): 1 Year
Console.WriteLine( "DateDiff.GetDescription(2): {0}", dateDiff.GetDescription( 2 ) );
// > DateDiff.GetDescription(2): 1 Year 4 Months
Console.WriteLine( "DateDiff.GetDescription(3): {0}", dateDiff.GetDescription( 3 ) );
// > DateDiff.GetDescription(3): 1 Year 4 Months 12 Days
Console.WriteLine( "DateDiff.GetDescription(4): {0}", dateDiff.GetDescription( 4 ) );
// > DateDiff.GetDescription(4): 1 Year 4 Months 12 Days 12 Hours
Console.WriteLine( "DateDiff.GetDescription(5): {0}", dateDiff.GetDescription( 5 ) );
// > DateDiff.GetDescription(5): 1 Year 4 Months 12 Days 12 Hours 41 Mins
Console.WriteLine( "DateDiff.GetDescription(6): {0}", dateDiff.GetDescription( 6 ) );
// > DateDiff.GetDescription(6): 1 Year 4 Months 12 Days 12 Hours 41 Mins 29 Secs
} // DateDiffSample
DateDiff还计算季度差。基于Joaquim的答案，但在结束日期月小于开始日期月时修复计算，并添加代码处理开始日期前的结束日期：
public static class GeneralHelper
{
public static int GetYears(DateTime startDate, DateTime endDate)
{
if (endDate < startDate)
return -GetYears(endDate, startDate);
int years = (endDate.Year - startDate.Year);
if (endDate.Year == startDate.Year)
return years;
if (endDate.Month < startDate.Month)
return years - 1;
if (endDate.Month == startDate.Month && endDate.Day < startDate.Day)
return years - 1;
return years;
}
public static int GetMonths(DateTime startDate, DateTime endDate)
{
if (startDate > endDate)
return -GetMonths(endDate, startDate);
int months = 12 * GetYears(startDate, endDate);
if (endDate.Month > startDate.Month)
months = months + endDate.Month - startDate.Month;
else
months = 12 - startDate.Month + endDate.Month;
if (endDate.Day < startDate.Day)
months = months - 1;
return months;
}
}
[TestClass()]
public class GeneralHelperTest
{
[TestMethod]
public void GetYearsTest()
{
Assert.AreEqual(0, GeneralHelper.GetYears(new DateTime(2000, 5, 5), new DateTime(2000, 12, 31)));
Assert.AreEqual(0, GeneralHelper.GetYears(new DateTime(2000, 5, 5), new DateTime(2001, 4, 4)));
Assert.AreEqual(0, GeneralHelper.GetYears(new DateTime(2000, 5, 5), new DateTime(2001, 5, 4)));
Assert.AreEqual(1, GeneralHelper.GetYears(new DateTime(2000, 5, 5), new DateTime(2001, 5, 5)));
Assert.AreEqual(1, GeneralHelper.GetYears(new DateTime(2000, 5, 5), new DateTime(2001, 12, 31)));
Assert.AreEqual(0, GeneralHelper.GetYears(new DateTime(2000, 12, 31), new DateTime(2000, 5, 5)));
Assert.AreEqual(0, GeneralHelper.GetYears(new DateTime(2001, 4, 4), new DateTime(2000, 5, 5)));
Assert.AreEqual(0, GeneralHelper.GetYears(new DateTime(2001, 5, 4), new DateTime(2000, 5, 5)));
Assert.AreEqual(-1, GeneralHelper.GetYears(new DateTime(2001, 5, 5), new DateTime(2000, 5, 5)));
Assert.AreEqual(-1, GeneralHelper.GetYears(new DateTime(2001, 12, 31), new DateTime(2000, 5, 5)));
}
[TestMethod]
public void GetMonthsTest()
{
Assert.AreEqual(0, GeneralHelper.GetMonths(new DateTime(2000, 5, 5), new DateTime(2000, 6, 4)));
Assert.AreEqual(1, GeneralHelper.GetMonths(new DateTime(2000, 5, 5), new DateTime(2000, 6, 5)));
Assert.AreEqual(1, GeneralHelper.GetMonths(new DateTime(2000, 5, 5), new DateTime(2000, 6, 6)));
Assert.AreEqual(11, GeneralHelper.GetMonths(new DateTime(2000, 5, 5), new DateTime(2001, 5, 4)));
Assert.AreEqual(12, GeneralHelper.GetMonths(new DateTime(2000, 5, 5), new DateTime(2001, 5, 5)));
Assert.AreEqual(13, GeneralHelper.GetMonths(new DateTime(2000, 5, 5), new DateTime(2001, 6, 6)));
Assert.AreEqual(0, GeneralHelper.GetMonths(new DateTime(2000, 6, 4), new DateTime(2000, 5, 5)));
Assert.AreEqual(-1, GeneralHelper.GetMonths(new DateTime(2000, 6, 5), new DateTime(2000, 5, 5)));
Assert.AreEqual(-1, GeneralHelper.GetMonths(new DateTime(2000, 6, 6), new DateTime(2000, 5, 5)));
Assert.AreEqual(-11, GeneralHelper.GetMonths(new DateTime(2001, 5, 4), new DateTime(2000, 5, 5)));
Assert.AreEqual(-12, GeneralHelper.GetMonths(new DateTime(2001, 5, 5), new DateTime(2000, 5, 5)));
Assert.AreEqual(-13, GeneralHelper.GetMonths(new DateTime(2001, 6, 6), new DateTime(2000, 5, 5)));
}
}
预期：。实际：我在寻求解决类似问题时遇到此帖子。我试图以年、月、周和天为单位查找动物的年龄。然后这些值将显示在SpinEdits中，用户可以手动更改这些值以查找/估计出生日期。当我的表单从mo传递出生日期时在第n个不到31天的时间里，计算出的值是1天。我根据上面Ic的答案得出了我的解决方案
在我的窗体加载后调用的主计算方法
birthDateDisplay.Text = birthDate.ToString("MM/dd/yyyy");
DateTime currentDate = DateTime.Now;
Int32 numOfDays = 0;
Int32 numOfWeeks = 0;
Int32 numOfMonths = 0;
Int32 numOfYears = 0;
// changed code to follow this model http://stackoverflow.com/posts/1083990/revisions
//years
TimeSpan diff = currentDate - birthDate;
numOfYears = diff.Days / 366;
DateTime workingDate = birthDate.AddYears(numOfYears);
while (workingDate.AddYears(1) <= currentDate)
{
workingDate = workingDate.AddYears(1);
numOfYears++;
}
//months
diff = currentDate - workingDate;
numOfMonths = diff.Days / 31;
workingDate = workingDate.AddMonths(numOfMonths);
while (workingDate.AddMonths(1) <= currentDate)
{
workingDate = workingDate.AddMonths(1);
numOfMonths++;
}
//weeks and days
diff = currentDate - workingDate;
numOfWeeks = diff.Days / 7; //weeks always have 7 days
// if bday month is same as current month and bday day is after current day, the date is off by 1 day
if(DateTime.Now.Month == birthDate.Month && DateTime.Now.Day < birthDate.Day)
numOfDays = diff.Days % 7 + 1;
else
numOfDays = diff.Days % 7;
// If the there are fewer than 31 days in the birth month, the date calculated is 1 off
// Dont need to add a day for the first day of the month
int daysInMonth = 0;
if ((daysInMonth = DateTime.DaysInMonth(birthDate.Year, birthDate.Month)) != 31 && birthDate.Day != 1)
{
startDateforCalc = DateTime.Now.Date.AddDays(31 - daysInMonth);
// Need to add 1 more day if it is a leap year and Feb 29th is the date
if (DateTime.IsLeapYear(birthDate.Year) && birthDate.Day == 29)
startDateforCalc = startDateforCalc.AddDays(1);
}
yearsSpinEdit.Value = numOfYears;
monthsSpinEdit.Value = numOfMonths;
weeksSpinEdit.Value = numOfWeeks;
daysSpinEdit.Value = numOfDays;
我知道这不是最好的解决办法，但它似乎对我有效
int monthDiff = System.Data.Linq.SqlClient.SqlMethods.DateDiffMonth(startDT, endDT);
// ----------------------------------------------------------------------
public void DateDiffSample()
{
DateTime date1 = new DateTime( 2009, 11, 8, 7, 13, 59 );
Console.WriteLine( "Date1: {0}", date1 );
// > Date1: 08.11.2009 07:13:59
DateTime date2 = new DateTime( 2011, 3, 20, 19, 55, 28 );
Console.WriteLine( "Date2: {0}", date2 );
// > Date2: 20.03.2011 19:55:28
DateDiff dateDiff = new DateDiff( date1, date2 );
// differences
Console.WriteLine( "DateDiff.Years: {0}", dateDiff.Years );
// > DateDiff.Years: 1
Console.WriteLine( "DateDiff.Quarters: {0}", dateDiff.Quarters );
// > DateDiff.Quarters: 5
Console.WriteLine( "DateDiff.Months: {0}", dateDiff.Months );
// > DateDiff.Months: 16
Console.WriteLine( "DateDiff.Weeks: {0}", dateDiff.Weeks );
// > DateDiff.Weeks: 70
Console.WriteLine( "DateDiff.Days: {0}", dateDiff.Days );
// > DateDiff.Days: 497
Console.WriteLine( "DateDiff.Weekdays: {0}", dateDiff.Weekdays );
// > DateDiff.Weekdays: 71
Console.WriteLine( "DateDiff.Hours: {0}", dateDiff.Hours );
// > DateDiff.Hours: 11940
Console.WriteLine( "DateDiff.Minutes: {0}", dateDiff.Minutes );
// > DateDiff.Minutes: 716441
Console.WriteLine( "DateDiff.Seconds: {0}", dateDiff.Seconds );
// > DateDiff.Seconds: 42986489
// elapsed
Console.WriteLine( "DateDiff.ElapsedYears: {0}", dateDiff.ElapsedYears );
// > DateDiff.ElapsedYears: 1
Console.WriteLine( "DateDiff.ElapsedMonths: {0}", dateDiff.ElapsedMonths );
// > DateDiff.ElapsedMonths: 4
Console.WriteLine( "DateDiff.ElapsedDays: {0}", dateDiff.ElapsedDays );
// > DateDiff.ElapsedDays: 12
Console.WriteLine( "DateDiff.ElapsedHours: {0}", dateDiff.ElapsedHours );
// > DateDiff.ElapsedHours: 12
Console.WriteLine( "DateDiff.ElapsedMinutes: {0}", dateDiff.ElapsedMinutes );
// > DateDiff.ElapsedMinutes: 41
Console.WriteLine( "DateDiff.ElapsedSeconds: {0}", dateDiff.ElapsedSeconds );
// > DateDiff.ElapsedSeconds: 29
// description
Console.WriteLine( "DateDiff.GetDescription(1): {0}", dateDiff.GetDescription( 1 ) );
// > DateDiff.GetDescription(1): 1 Year
Console.WriteLine( "DateDiff.GetDescription(2): {0}", dateDiff.GetDescription( 2 ) );
// > DateDiff.GetDescription(2): 1 Year 4 Months
Console.WriteLine( "DateDiff.GetDescription(3): {0}", dateDiff.GetDescription( 3 ) );
// > DateDiff.GetDescription(3): 1 Year 4 Months 12 Days
Console.WriteLine( "DateDiff.GetDescription(4): {0}", dateDiff.GetDescription( 4 ) );
// > DateDiff.GetDescription(4): 1 Year 4 Months 12 Days 12 Hours
Console.WriteLine( "DateDiff.GetDescription(5): {0}", dateDiff.GetDescription( 5 ) );
// > DateDiff.GetDescription(5): 1 Year 4 Months 12 Days 12 Hours 41 Mins
Console.WriteLine( "DateDiff.GetDescription(6): {0}", dateDiff.GetDescription( 6 ) );
// > DateDiff.GetDescription(6): 1 Year 4 Months 12 Days 12 Hours 41 Mins 29 Secs
} // DateDiffSample
public static class GeneralHelper
{
public static int GetYears(DateTime startDate, DateTime endDate)
{
if (endDate < startDate)
return -GetYears(endDate, startDate);
int years = (endDate.Year - startDate.Year);
if (endDate.Year == startDate.Year)
return years;
if (endDate.Month < startDate.Month)
return years - 1;
if (endDate.Month == startDate.Month && endDate.Day < startDate.Day)
return years - 1;
return years;
}
public static int GetMonths(DateTime startDate, DateTime endDate)
{
if (startDate > endDate)
return -GetMonths(endDate, startDate);
int months = 12 * GetYears(startDate, endDate);
if (endDate.Month > startDate.Month)
months = months + endDate.Month - startDate.Month;
else
months = 12 - startDate.Month + endDate.Month;
if (endDate.Day < startDate.Day)
months = months - 1;
return months;
}
}
[TestClass()]
public class GeneralHelperTest
{
[TestMethod]
public void GetYearsTest()
{
Assert.AreEqual(0, GeneralHelper.GetYears(new DateTime(2000, 5, 5), new DateTime(2000, 12, 31)));
Assert.AreEqual(0, GeneralHelper.GetYears(new DateTime(2000, 5, 5), new DateTime(2001, 4, 4)));
Assert.AreEqual(0, GeneralHelper.GetYears(new DateTime(2000, 5, 5), new DateTime(2001, 5, 4)));
Assert.AreEqual(1, GeneralHelper.GetYears(new DateTime(2000, 5, 5), new DateTime(2001, 5, 5)));
Assert.AreEqual(1, GeneralHelper.GetYears(new DateTime(2000, 5, 5), new DateTime(2001, 12, 31)));
Assert.AreEqual(0, GeneralHelper.GetYears(new DateTime(2000, 12, 31), new DateTime(2000, 5, 5)));
Assert.AreEqual(0, GeneralHelper.GetYears(new DateTime(2001, 4, 4), new DateTime(2000, 5, 5)));
Assert.AreEqual(0, GeneralHelper.GetYears(new DateTime(2001, 5, 4), new DateTime(2000, 5, 5)));
Assert.AreEqual(-1, GeneralHelper.GetYears(new DateTime(2001, 5, 5), new DateTime(2000, 5, 5)));
Assert.AreEqual(-1, GeneralHelper.GetYears(new DateTime(2001, 12, 31), new DateTime(2000, 5, 5)));
}
[TestMethod]
public void GetMonthsTest()
{
Assert.AreEqual(0, GeneralHelper.GetMonths(new DateTime(2000, 5, 5), new DateTime(2000, 6, 4)));
Assert.AreEqual(1, GeneralHelper.GetMonths(new DateTime(2000, 5, 5), new DateTime(2000, 6, 5)));
Assert.AreEqual(1, GeneralHelper.GetMonths(new DateTime(2000, 5, 5), new DateTime(2000, 6, 6)));
Assert.AreEqual(11, GeneralHelper.GetMonths(new DateTime(2000, 5, 5), new DateTime(2001, 5, 4)));
Assert.AreEqual(12, GeneralHelper.GetMonths(new DateTime(2000, 5, 5), new DateTime(2001, 5, 5)));
Assert.AreEqual(13, GeneralHelper.GetMonths(new DateTime(2000, 5, 5), new DateTime(2001, 6, 6)));
Assert.AreEqual(0, GeneralHelper.GetMonths(new DateTime(2000, 6, 4), new DateTime(2000, 5, 5)));
Assert.AreEqual(-1, GeneralHelper.GetMonths(new DateTime(2000, 6, 5), new DateTime(2000, 5, 5)));
Assert.AreEqual(-1, GeneralHelper.GetMonths(new DateTime(2000, 6, 6), new DateTime(2000, 5, 5)));
Assert.AreEqual(-11, GeneralHelper.GetMonths(new DateTime(2001, 5, 4), new DateTime(2000, 5, 5)));
Assert.AreEqual(-12, GeneralHelper.GetMonths(new DateTime(2001, 5, 5), new DateTime(2000, 5, 5)));
Assert.AreEqual(-13, GeneralHelper.GetMonths(new DateTime(2001, 6, 6), new DateTime(2000, 5, 5)));
}
}
Assert.AreEqual(24, GeneralHelper.GetMonths(new DateTime(2000, 5, 5), new DateTime(2003, 5, 5)));
birthDateDisplay.Text = birthDate.ToString("MM/dd/yyyy");
DateTime currentDate = DateTime.Now;
Int32 numOfDays = 0;
Int32 numOfWeeks = 0;
Int32 numOfMonths = 0;
Int32 numOfYears = 0;
// changed code to follow this model http://stackoverflow.com/posts/1083990/revisions
//years
TimeSpan diff = currentDate - birthDate;
numOfYears = diff.Days / 366;
DateTime workingDate = birthDate.AddYears(numOfYears);
while (workingDate.AddYears(1) <= currentDate)
{
workingDate = workingDate.AddYears(1);
numOfYears++;
}
//months
diff = currentDate - workingDate;
numOfMonths = diff.Days / 31;
workingDate = workingDate.AddMonths(numOfMonths);
while (workingDate.AddMonths(1) <= currentDate)
{
workingDate = workingDate.AddMonths(1);
numOfMonths++;
}
//weeks and days
diff = currentDate - workingDate;
numOfWeeks = diff.Days / 7; //weeks always have 7 days
// if bday month is same as current month and bday day is after current day, the date is off by 1 day
if(DateTime.Now.Month == birthDate.Month && DateTime.Now.Day < birthDate.Day)
numOfDays = diff.Days % 7 + 1;
else
numOfDays = diff.Days % 7;
// If the there are fewer than 31 days in the birth month, the date calculated is 1 off
// Dont need to add a day for the first day of the month
int daysInMonth = 0;
if ((daysInMonth = DateTime.DaysInMonth(birthDate.Year, birthDate.Month)) != 31 && birthDate.Day != 1)
{
startDateforCalc = DateTime.Now.Date.AddDays(31 - daysInMonth);
// Need to add 1 more day if it is a leap year and Feb 29th is the date
if (DateTime.IsLeapYear(birthDate.Year) && birthDate.Day == 29)
startDateforCalc = startDateforCalc.AddDays(1);
}
yearsSpinEdit.Value = numOfYears;
monthsSpinEdit.Value = numOfMonths;
weeksSpinEdit.Value = numOfWeeks;
daysSpinEdit.Value = numOfDays;
birthDate = startDateforCalc.Date.AddYears(-((Int32)yearsSpinEdit.Value)).AddMonths(-((Int32)monthsSpinEdit.Value)).AddDays(-(7 * ((Int32)weeksSpinEdit.Value) + ((Int32)daysSpinEdit.Value)));
birthDateDisplay.Text = birthDate.ToString("MM/dd/yyyy");
private void Form1_Load(object sender, EventArgs e) {
DateTime dteThen = DateTime.Parse("3/31/2010");
DateTime dteNow = DateTime.Now;
int intDiffInYears = 0;
int intDiffInMonths = 0;
int intDiffInDays = 0;
if (dteNow.Month >= dteThen.Month)
{
if (dteNow.Day >= dteThen.Day)
{ // this is a best case, easy subtraction situation
intDiffInYears = dteNow.Year - dteThen.Year;
intDiffInMonths = dteNow.Month - dteThen.Month;
intDiffInDays = dteNow.Day - dteThen.Day;
}
else
{ // else we need to substract one from the month diff (borrow the one)
// and days get wacky.
// Watch for the outlier of Month = Month with DayNow < DayThen, as then we've
// got to subtract one from the year diff to borrow a month and have enough
// days to subtract Then from Now.
if (dteNow.Month == dteThen.Month)
{
intDiffInYears = dteNow.Year - dteThen.Year - 1;
intDiffInMonths = 11; // we borrowed a year and broke ONLY
// the LAST month into subtractable days
// Stay with me -- because we borrowed days from the year, not the month,
// this is much different than what appears to be a similar calculation below.
// We know we're a full intDiffInYears years apart PLUS eleven months.
// Now we need to know how many days occurred before dteThen was done with
// dteThen.Month. Then we add the number of days we've "earned" in the current
// month.
//
// So 12/25/2009 to 12/1/2011 gives us
// 11-9 = 2 years, minus one to borrow days = 1 year difference.
// 1 year 11 months - 12 months = 11 months difference
// (days from 12/25 to the End Of Month) + (Begin of Month to 12/1) =
// (31-25) + (0+1) =
// 6 + 1 =
// 7 days diff
//
// 12/25/2009 to 12/1/2011 is 1 year, 11 months, 7 days apart. QED.
int intDaysInSharedMonth = System.DateTime.DaysInMonth(dteThen.Year, dteThen.Month);
intDiffInDays = intDaysInSharedMonth - dteThen.Day + dteNow.Day;
}
else
{
intDiffInYears = dteNow.Year - dteThen.Year;
intDiffInMonths = dteNow.Month - dteThen.Month - 1;
// So now figure out how many more days we'd need to get from dteThen's
// intDiffInMonth-th month to get to the current month/day in dteNow.
// That is, if we're comparing 2/8/2011 to 11/7/2011, we've got (10/8-2/8) = 8
// full months between the two dates. But then we've got to go from 10/8 to
// 11/07. So that's the previous month's (October) number of days (31) minus
// the number of days into the month dteThen went (8), giving the number of days
// needed to get us to the end of the month previous to dteNow (23). Now we
// add back the number of days that we've gone into dteNow's current month (7)
// to get the total number of days we've gone since we ran the greatest integer
// function on the month difference (23 to the end of the month + 7 into the
// next month == 30 total days. You gotta make it through October before you
// get another month, G, and it's got 31 days).
int intDaysInPrevMonth = System.DateTime.DaysInMonth(dteNow.Year, (dteNow.Month - 1));
intDiffInDays = intDaysInPrevMonth - dteThen.Day + dteNow.Day;
}
}
}
else
{
// else dteThen.Month > dteNow.Month, and we've got to amend our year subtraction
// because we haven't earned our entire year yet, and don't want an obo error.
intDiffInYears = dteNow.Year - dteThen.Year - 1;
// So if the dates were THEN: 6/15/1999 and NOW: 2/20/2010...
// Diff in years is 2010-1999 = 11, but since we're not to 6/15 yet, it's only 10.
// Diff in months is (Months in year == 12) - (Months lost between 1/1/1999 and 6/15/1999
// when dteThen's clock wasn't yet rolling == 6) = 6 months, then you add the months we
// have made it into this year already. The clock's been rolling through 2/20, so two months.
// Note that if the 20 in 2/20 hadn't been bigger than the 15 in 6/15, we're back to the
// intDaysInPrevMonth trick from earlier. We'll do that below, too.
intDiffInMonths = 12 - dteThen.Month + dteNow.Month;
if (dteNow.Day >= dteThen.Day)
{
intDiffInDays = dteNow.Day - dteThen.Day;
}
else
{
intDiffInMonths--; // subtract the month from which we're borrowing days.
// Maybe we shoulda factored this out previous to the if (dteNow.Month > dteThen.Month)
// call, but I think this is more readable code.
int intDaysInPrevMonth = System.DateTime.DaysInMonth(dteNow.Year, (dteNow.Month - 1));
intDiffInDays = intDaysInPrevMonth - dteThen.Day + dteNow.Day;
}
}
this.addToBox("Years: " + intDiffInYears + " Months: " + intDiffInMonths + " Days: " + intDiffInDays); // adds results to a rich text box.
}
public int getMonths(DateTime startDate, DateTime endDate)
{
int months = 0;
if (endDate.Month <= startDate.Month)
{
if (endDate.Day < startDate.Day)
{
months = (12 * (endDate.Year - startDate.Year - 1))
+ (12 - startDate.Month + endDate.Month - 1);
}
else if (endDate.Month < startDate.Month)
{
months = (12 * (endDate.Year - startDate.Year - 1))
+ (12 - startDate.Month + endDate.Month);
}
else // (endDate.Month == startDate.Month) && (endDate.Day >= startDate.Day)
{
months = (12 * (endDate.Year - startDate.Year));
}
}
else if (endDate.Day < startDate.Day)
{
months = (12 * (endDate.Year - startDate.Year))
+ (endDate.Month - startDate.Month) - 1;
}
else // (endDate.Month > startDate.Month) && (endDate.Day >= startDate.Day)
{
months = (12 * (endDate.Year - startDate.Year))
+ (endDate.Month - startDate.Month);
}
return months;
}
Console.WriteLine("Enter your Date of Birth to Know your Current age in DD/MM/YY Format");
string str = Console.ReadLine();
DateTime dt1 = DateTime.Parse(str);
DateTime dt2 = DateTime.Parse("10/06/2012");
int result = (dt2 - dt1).Days;
result = result / 365;
Console.WriteLine("Your Current age is {0} years.",result);
private void dateTimePicker1_ValueChanged(object sender, EventArgs e)
{
int gyear = dateTimePicker1.Value.Year;
int gmonth = dateTimePicker1.Value.Month;
int gday = dateTimePicker1.Value.Day;
int syear = DateTime.Now.Year;
int smonth = DateTime.Now.Month;
int sday = DateTime.Now.Day;
int difday = DateTime.DaysInMonth(syear, gmonth);
agedisplay = (syear - gyear);
lmonth = (smonth - gmonth);
lday = (sday - gday);
if (smonth < gmonth)
{
agedisplay = agedisplay - 1;
}
if (smonth == gmonth)
{
if (sday < (gday))
{
agedisplay = agedisplay - 1;
}
}
if (smonth < gmonth)
{
lmonth = (-(-smonth)+(-gmonth)+12);
}
if (lday < 0)
{
lday = difday - (-lday);
lmonth = lmonth - 1;
}
if (smonth == gmonth && sday < gday&&gyear!=syear)
{
lmonth = 11;
}
ageDisplay.Text = Convert.ToString(agedisplay) + " Years, " + lmonth + " Months, " + lday + " Days.";
}
DateTime startTime = DateTime.Now;
DateTime endTime = DateTime.Now.AddSeconds( 75 );
TimeSpan span = endTime.Subtract ( startTime );
Console.WriteLine( "Time Difference (seconds): " + span.Seconds );
Console.WriteLine( "Time Difference (minutes): " + span.Minutes );
Console.WriteLine( "Time Difference (hours): " + span.Hours );
Console.WriteLine( "Time Difference (days): " + span.Days );
Time Difference (seconds): 15
Time Difference (minutes): 1
Time Difference (hours): 0
Time Difference (days): 0
public interface IDateDifference
{
void SetDates(DateTime start, DateTime end);
int GetYears();
int GetMonths();
int GetDays();
}
[TestFixture]
public abstract class DateDifferenceTests<DDC> where DDC : IDateDifference, new()
public class Rajeshwaran_S_P_Test : DateDifferenceTests<Rajeshwaran_S_P>
{
}
[TestFixture]
public abstract class DateDifferenceTests<DDC> where DDC : IDateDifference, new()
{
protected IDateDifference ddClass;
[SetUp]
public void Init()
{
ddClass = new DDC();
}
[Test]
public void BasicTest()
{
ddClass.SetDates(new DateTime(2012, 12, 1), new DateTime(2012, 12, 25));
CheckResults(0, 0, 24);
}
[Test]
public void AlmostTwoYearsTest()
{
ddClass.SetDates(new DateTime(2010, 8, 29), new DateTime(2012, 8, 14));
CheckResults(1, 11, 16);
}
[Test]
public void AlmostThreeYearsTest()
{
ddClass.SetDates(new DateTime(2009, 7, 29), new DateTime(2012, 7, 14));
CheckResults(2, 11, 15);
}
[Test]
public void BornOnALeapYearTest()
{
ddClass.SetDates(new DateTime(2008, 2, 29), new DateTime(2009, 2, 28));
CheckControversialResults(0, 11, 30, 1, 0, 0);
}
[Test]
public void BornOnALeapYearTest2()
{
ddClass.SetDates(new DateTime(2008, 2, 29), new DateTime(2009, 3, 1));
CheckControversialResults(1, 0, 0, 1, 0, 1);
}
[Test]
public void LongMonthToLongMonth()
{
ddClass.SetDates(new DateTime(2010, 1, 31), new DateTime(2010, 3, 31));
CheckResults(0, 2, 0);
}
[Test]
public void LongMonthToLongMonthPenultimateDay()
{
ddClass.SetDates(new DateTime(2009, 1, 31), new DateTime(2009, 3, 30));
CheckResults(0, 1, 30);
}
[Test]
public void LongMonthToShortMonth()
{
ddClass.SetDates(new DateTime(2009, 8, 31), new DateTime(2009, 9, 30));
CheckControversialResults(0, 1, 0, 0, 0, 30);
}
[Test]
public void LongMonthToPartWayThruShortMonth()
{
ddClass.SetDates(new DateTime(2009, 8, 31), new DateTime(2009, 9, 10));
CheckResults(0, 0, 10);
}
private void CheckResults(int years, int months, int days)
{
Assert.AreEqual(years, ddClass.GetYears());
Assert.AreEqual(months, ddClass.GetMonths());
Assert.AreEqual(days, ddClass.GetDays());
}
private void CheckControversialResults(int years, int months, int days,
int yearsAlt, int monthsAlt, int daysAlt)
{
// gives the right output but unhelpful messages
bool success = ((ddClass.GetYears() == years
&& ddClass.GetMonths() == months
&& ddClass.GetDays() == days)
||
(ddClass.GetYears() == yearsAlt
&& ddClass.GetMonths() == monthsAlt
&& ddClass.GetDays() == daysAlt));
Assert.IsTrue(success);
}
}
ChuckRostance_Test 3 failures S S S F S S F S F
Dave_Test 6 failures F F S F F F F S S
Dylan_Hayes_Test 9 failures F F F F F F F F F
ho1_Test 3 failures F F S S S S F S S
Jani_Test 6 failures F F S F F F F S S
Jon_Test 1 failure S S S S S S F S S
lc_Test 2 failures S S S S S F F S S
LukeH_Test 1 failure S S S S S S F S S
Malu_MN_Test 1 failure S S S S S S S F S
Mohammed_Ijas_Nasirudeen_Test 2 failures F S S F S S S S S
pk_Test 6 failures F F F S S F F F S
Rajeshwaran_S_P_Test 7 failures F F S F F S F F F
ruffin_Test 3 failures F S S F S S F S S
this_curious_geek_Test 2 failures F S S F S S S S S
var ld1 = new LocalDate(2012, 1, 1);
var ld2 = new LocalDate(2013, 12, 25);
var period = Period.Between(ld1, ld2);
Debug.WriteLine(period); // "P1Y11M24D" (ISO8601 format)
Debug.WriteLine(period.Years); // 1
Debug.WriteLine(period.Months); // 11
Debug.WriteLine(period.Days); // 24
TimeSpan period = endDate.AddDays(1) - startDate;
DateTime date = new DateTime(period.Ticks);
int totalYears = date.Year - 1;
int totalMonths = ((date.Year - 1) * 12) + date.Month - 1;
int totalWeeks = (int)period.TotalDays / 7;
public static string GetDifference(DateTime d1, DateTime d2)
{
int[] monthDay = new int[12] { 31, -1, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
DateTime fromDate;
DateTime toDate;
int year;
int month;
int day;
int increment = 0;
if (d1 > d2)
{
fromDate = d2;
toDate = d1;
}
else
{
fromDate = d1;
toDate = d2;
}
// Calculating Days
if (fromDate.Day > toDate.Day)
{
increment = monthDay[fromDate.Month - 1];
}
if (increment == -1)
{
if (DateTime.IsLeapYear(fromDate.Year))
{
increment = 29;
}
else
{
increment = 28;
}
}
if (increment != 0)
{
day = (toDate.Day + increment) - fromDate.Day;
increment = 1;
}
else
{
day = toDate.Day - fromDate.Day;
}
// Month Calculation
if ((fromDate.Month + increment) > toDate.Month)
{
month = (toDate.Month + 12) - (fromDate.Month + increment);
increment = 1;
}
else
{
month = (toDate.Month) - (fromDate.Month + increment);
increment = 0;
}
// Year Calculation
year = toDate.Year - (fromDate.Year + increment);
return year + " years " + month + " months " + day + " days";
}
public class DateDiffernce
{
private int m_nDays = -1;
private int m_nWeek;
private int m_nMonth = -1;
private int m_nYear;
public int Days
{
get
{
return m_nDays;
}
}
public int Weeks
{
get
{
return m_nWeek;
}
}
public int Months
{
get
{
return m_nMonth;
}
}
public int Years
{
get
{
return m_nYear;
}
}
public void GetDifferenceBetwwenTwoDate(DateTime objDateTimeFromDate, DateTime objDateTimeToDate)
{
if (objDateTimeFromDate.Date > objDateTimeToDate.Date)
{
DateTime objDateTimeTemp = objDateTimeFromDate;
objDateTimeFromDate = objDateTimeToDate;
objDateTimeToDate = objDateTimeTemp;
}
if (objDateTimeFromDate == objDateTimeToDate)
{
//textBoxDifferenceDays.Text = " Same dates";
//textBoxAllDifference.Text = " Same dates";
return;
}
// If From Date's Day is bigger than borrow days from previous month
// & then subtract.
if (objDateTimeFromDate.Day > objDateTimeToDate.Day)
{
objDateTimeToDate = objDateTimeToDate.AddMonths(-1);
int nMonthDays = DateTime.DaysInMonth(objDateTimeToDate.Year, objDateTimeToDate.Month);
m_nDays = objDateTimeToDate.Day + nMonthDays - objDateTimeFromDate.Day;
}
// If From Date's Month is bigger than borrow 12 Month
// & then subtract.
if (objDateTimeFromDate.Month > objDateTimeToDate.Month)
{
objDateTimeToDate = objDateTimeToDate.AddYears(-1);
m_nMonth = objDateTimeToDate.Month + 12 - objDateTimeFromDate.Month;
}
//Below are best cases - simple subtraction
if (m_nDays == -1)
{
m_nDays = objDateTimeToDate.Day - objDateTimeFromDate.Day;
}
if (m_nMonth == -1)
{
m_nMonth = objDateTimeToDate.Month - objDateTimeFromDate.Month;
}
m_nYear = objDateTimeToDate.Year - objDateTimeFromDate.Year;
m_nWeek = m_nDays / 7;
m_nDays = m_nDays % 7;
}
}
int day=0,month=0,year=0;
DateTime smallDate = Convert.ToDateTime(string.Format("{0}", "01.01.1900"));
DateTime bigDate = Convert.ToDateTime(string.Format("{0}", "05.06.2019"));
TimeSpan timeSpan = new TimeSpan();
//timeSpan is diff between bigDate and smallDate as days
timeSpan = bigDate - smallDate;
//year is totalDays / 365 as int
year = timeSpan.Days / 365;
//smallDate.AddYears(year) is closing the difference for year because we found the year variable
smallDate = smallDate.AddYears(year);
//again subtraction because we don't need the year now
timeSpan = bigDate - smallDate;
//month is totalDays / 30 as int
month = timeSpan.Days / 30;
//smallDate.AddMonths(month) is closing the difference for month because we found the month variable
smallDate = smallDate.AddMonths(month);
if (bigDate > smallDate)
{
timeSpan = bigDate - smallDate;
day = timeSpan.Days;
}
//else it is mean already day is 0