如何仅在DateTime对象中删除C#中日期的时间部分?
我需要删除日期时间的时间部分,或者可能在如何仅在DateTime对象中删除C#中日期的时间部分?,c#,datetime,C#,Datetime,我需要删除日期时间的时间部分,或者可能在对象表单中使用以下格式的日期,而不是字符串 06/26/2009 00:00:00:000 我不能使用任何字符串转换方法,因为我需要对象表单中的日期 我首先尝试将日期时间转换为字符串,从中删除特定于时间的日期,但当我再次将其转换回日期时间对象时,它会添加12:00:00 AM。查看该属性 获取此实例的日期组件 使用属性: var dateAndTime = DateTime.Now; var date = dateAndTime.Date; date变
对象
表单中使用以下格式的日期,而不是字符串
06/26/2009 00:00:00:000
我不能使用任何字符串
转换方法,因为我需要对象
表单中的日期
我首先尝试将日期时间
转换为字符串
,从中删除特定于时间的日期,但当我再次将其转换回日期时间
对象
时,它会添加12:00:00 AM
。查看该属性
获取此实例的日期组件
使用属性:
var dateAndTime = DateTime.Now;
var date = dateAndTime.Date;
date
变量将包含日期,时间部分将为00:00:00
试着建立你自己的结构。DateTime对象将同时具有日期和时间属性将在午夜返回日期 一个选项是分别获取各个值(天/月/年),并将其存储在所需的类型中
var dateAndTime = DateTime.Now;
int year = dateAndTime.Year;
int month = dateAndTime.Month;
int day = dateAndTime.Day;
string.Format("{0}/{1}/{2}", month, day, year);
您可以使用格式字符串为输出字符串指定您喜欢的格式
DateTime dateAndTime = DateTime.Now;
Console.WriteLine(dateAndTime.ToString("dd/MM/yyyy")); // Will give you smth like 25/05/2011
阅读更多关于 根据我的经验,上述解决方案都不起作用,可能是因为我想从数据库中删除提取日期的时间,但下面的代码运行良好:
var date = target_date.Value.ToString("dd/MM/yyyy");
如果你从日历上取日期,我们也有时间。这不是所有时候都需要的。使用此选项,我们可以从日期中删除时间。您不能。NET中的DateTime始终有一个时间,默认为00:00:00:000。DateTime的Date属性也是DateTime(!),因此时间也默认为00:00:00:000
这是.NET Framework中的一个不足之处,可以说.NET中的DateTime违反了 使用ToSortDateString方法。请参阅文档
您可以在Datetime中的唯一日期尝试此选项
String.Format("{0:d/M/YYYY}",dt);
其中dt是
日期时间
在试图解决原始问题时遇到了这篇文章
我正在使用Asp.Net,经过一些研究,我发现当您绑定到代码中日期的值时,可以删除时间,这样它就不会显示在屏幕上
C#:
aspx:
使用
我很惊讶没有人提到日期时间。今天
var date = DateTime.Today;
// {7/1/2014 12:00:00 AM}
请参见将变量声明为字符串 例如:
public string dateOfBirth ;
然后指定一个值,如:
dateOfBirth = ((DateTime)(datetimevaluefromDB)).ToShortDateString();
DateTime对象的日期将忽略时间部分 以下是代码:
DateTime dateA = DateTime.Now;
DateTime dateB = DateTime.Now.AddHours(1).AddMinutes(10).AddSeconds(14);
Console.WriteLine("Date A: {0}",dateA.ToString("o"));
Console.WriteLine("Date B: {0}", dateB.ToString("o"));
Console.WriteLine(String.Format("Comparing objects A==B? {0}", dateA.Equals(dateB)));
Console.WriteLine(String.Format("Comparing ONLY Date property A==B? {0}", dateA.Date.Equals(dateB.Date)));
Console.ReadLine();
输出:
>Date A: 2014-09-04T07:53:14.6404013+02:00
>Date B: 2014-09-04T09:03:28.6414014+02:00
>Comparing objects A==B? False
>Comparing ONLY Date property A==B? True
使用一点正则表达式:
Regex.Match(Date.Now.ToString(), @"^.*?(?= )");
以以下格式生成日期:dd/mm/yyyy如果要将其转换为字符串,则可以很容易地这样做 我把date作为你的DateTime对象
date.ToString("d");
这将只提供日期。供datalist、repeater使用。。在aspx页面中:创建一个只包含所需属性的结构。然后使用扩展方法从DateTime实例轻松获取该结构
public struct DateOnly
{
public int Day { get; set; }
public int Month { get; set; }
public int Year { get; set; }
}
public static class DateOnlyExtensions
{
public static DateOnly GetDateOnly(this DateTime dt)
{
return new DateOnly
{
Day = dt.Day,
Month = dt.Month,
Year = dt.Year
};
}
}
用法
我知道这是一篇有很多答案的老文章,但我还没有看到这种删除时间部分的方法。假设您有一个名为
myDate
的DateTime
变量,其中日期包含时间部分。您可以使用此构造函数从中创建一个新的DateTime
对象,不带时间部分:
public DateTime(int year, int month, int day);
像这样:
myDate = new DateTime(myDate.Year, myDate.Month, myDate.Day);
这样,您可以在旧对象的基础上创建一个新的
DateTime
对象,将00:00:00作为时间部分。这种只获取日期而不获取时间的方法
DateTime date = DateTime.Now;
string Strdateonly = date.ToString("d");
输出=2015年5月16日这可以简单地通过以下方式完成:
var dateOnly = new DateTime(dateTime.Year, dateTime.Month, dateTime.Day)
以上答案都没有解决我在winforms上的问题 仅访问日期的最简单方法是Datetime中的简单函数:
DateTime dt = DateTime.now;
String BirthDate = dt.ToShortDateString();
您将只在生日字符串中包含日期。我编写了一个
DateOnly
结构。这在皮肤下使用日期时间,但不公开时间部分:
using System;
public struct DateOnly : IComparable, IFormattable, IComparable<DateOnly>, IEquatable<DateOnly>
{
private DateTime _dateValue;
public int CompareTo(object obj)
{
if (obj == null)
{
return 1;
}
DateOnly otherDateOnly = (DateOnly)obj;
if (otherDateOnly != null)
{
return ToDateTime().CompareTo(otherDateOnly.ToDateTime());
}
else
{
throw new ArgumentException("Object is not a DateOnly");
}
}
int IComparable<DateOnly>.CompareTo(DateOnly other)
{
return this.CompareToOfT(other);
}
public int CompareToOfT(DateOnly other)
{
// If other is not a valid object reference, this instance is greater.
if (other == new DateOnly())
{
return 1;
}
return this.ToDateTime().CompareTo(other.ToDateTime());
}
bool IEquatable<DateOnly>.Equals(DateOnly other)
{
return this.EqualsOfT(other);
}
public bool EqualsOfT(DateOnly other)
{
if (other == new DateOnly())
{
return false;
}
if (this.Year == other.Year && this.Month == other.Month && this.Day == other.Day)
{
return true;
}
else
{
return false;
}
}
public static DateOnly Now()
{
return new DateOnly(DateTime.Now.Year, DateTime.Now.Month, DateTime.Now.Day);
}
public static bool TryParse(string s, ref DateOnly result)
{
DateTime dateValue = default(DateTime);
if (DateTime.TryParse(s, out dateValue))
{
result = new DateOnly(dateValue.Year, dateValue.Month, dateValue.Day);
return true;
}
else
{
return false;
}
}
public static DateOnly Parse(string s)
{
DateTime dateValue = default(DateTime);
dateValue = DateTime.Parse(s);
return new DateOnly(dateValue.Year, dateValue.Month, dateValue.Day);
}
public static DateOnly ParseExact(string s, string format)
{
CultureInfo provider = CultureInfo.InvariantCulture;
DateTime dateValue = default(DateTime);
dateValue = DateTime.ParseExact(s, format, provider);
return new DateOnly(dateValue.Year, dateValue.Month, dateValue.Day);
}
public DateOnly(int yearValue, int monthValue, int dayValue) : this()
{
Year = yearValue;
Month = monthValue;
Day = dayValue;
}
public DateOnly AddDays(double value)
{
DateTime d = new DateTime(this.Year, this.Month, this.Day);
d = d.AddDays(value);
return new DateOnly(d.Year, d.Month, d.Day);
}
public DateOnly AddMonths(int months)
{
DateTime d = new DateTime(this.Year, this.Month, this.Day);
d = d.AddMonths(months);
return new DateOnly(d.Year, d.Month, d.Day);
}
public DateOnly AddYears(int years)
{
DateTime d = new DateTime(this.Year, this.Month, this.Day);
d = d.AddYears(years);
return new DateOnly(d.Year, d.Month, d.Day);
}
public DayOfWeek DayOfWeek
{
get
{
return _dateValue.DayOfWeek;
}
}
public DateTime ToDateTime()
{
return _dateValue;
}
public int Year
{
get
{
return _dateValue.Year;
}
set
{
_dateValue = new DateTime(value, Month, Day);
}
}
public int Month
{
get
{
return _dateValue.Month;
}
set
{
_dateValue = new DateTime(Year, value, Day);
}
}
public int Day
{
get
{
return _dateValue.Day;
}
set
{
_dateValue = new DateTime(Year, Month, value);
}
}
public static bool operator == (DateOnly aDateOnly1, DateOnly aDateOnly2)
{
return (aDateOnly1.ToDateTime() == aDateOnly2.ToDateTime());
}
public static bool operator != (DateOnly aDateOnly1, DateOnly aDateOnly2)
{
return (aDateOnly1.ToDateTime() != aDateOnly2.ToDateTime());
}
public static bool operator > (DateOnly aDateOnly1, DateOnly aDateOnly2)
{
return (aDateOnly1.ToDateTime() > aDateOnly2.ToDateTime());
}
public static bool operator < (DateOnly aDateOnly1, DateOnly aDateOnly2)
{
return (aDateOnly1.ToDateTime() < aDateOnly2.ToDateTime());
}
public static bool operator >= (DateOnly aDateOnly1, DateOnly aDateOnly2)
{
return (aDateOnly1.ToDateTime() >= aDateOnly2.ToDateTime());
}
public static bool operator <= (DateOnly aDateOnly1, DateOnly aDateOnly2)
{
return (aDateOnly1.ToDateTime() <= aDateOnly2.ToDateTime());
}
public static TimeSpan operator - (DateOnly aDateOnly1, DateOnly aDateOnly2)
{
return (aDateOnly1.ToDateTime() - aDateOnly2.ToDateTime());
}
public override string ToString()
{
return _dateValue.ToShortDateString();
}
public string ToString(string format)
{
return _dateValue.ToString(format);
}
public string ToString(string fmt, IFormatProvider provider)
{
return string.Format("{0:" + fmt + "}", _dateValue);
}
public string ToShortDateString()
{
return _dateValue.ToShortDateString();
}
public string ToDbFormat()
{
return string.Format("{0:yyyy-MM-dd}", _dateValue);
}
}
使用系统;
public struct DateOnly:IComparable、IFormattable、IComparable、IEquatable
{
私有日期时间_dateValue;
公共整数比较(对象对象对象)
{
if(obj==null)
{
返回1;
}
DateOnly otherDateOnly=(DateOnly)obj;
if(otherDateOnly!=null)
{
返回ToDateTime().CompareTo(otherDateOnly.ToDateTime());
}
其他的
{
抛出新ArgumentException(“对象不是DateOnly”);
}
}
int IComparable.CompareTo(仅日期其他)
{
返回此.compareToft(其他);
}
public int compareToft(仅日期其他)
{
//如果other不是有效的对象引用,则此实例更大。
如果(其他==new DateOnly())
{
返回1;
}
返回此.ToDateTime().CompareTo(其他.ToDateTime());
}
bool IEquatable.Equals(仅日期其他)
{
返回此.EqualsOfT(其他);
}
public bool EqualsOfT(仅限日期其他)
{
如果(其他==new DateOnly())
{
返回false;
}
if(this.Year==other.Year&&this.Month==other.Month&&this.Day==other.Day)
{
返回true;
}
其他的
{
返回false;
}
}
公共静态日期仅限现在()
{
仅返回新日期(DateTime.Now.Year、DateTime.Now.Month、DateTime.Now.Day);
}
公共静态bool TryParse(字符串s,ref DateOnly result)
{
DateTime dateValue=默认值(DateTime);
if(DateTime.TryParse(s,out dateValue))
{
结果=仅新日期(dateValue.Year、dateValue.Month、dateValue.Day);
返回true;
}
其他的
{
返回false;
}
}
公共静态DateOnly解析(字符串s)
{
DateTime dateValue=默认值(DateTime);
dateValue=DateTime.Parse;
仅返回新日期(dateValue.Year、dateValue.Month、dateValue.Day);
}
公共静态日期仅解析精确(字符串s,字符串形式
DateTime dt = DateTime.Now;
DateOnly result = dt.GetDateOnly();
public DateTime(int year, int month, int day);
myDate = new DateTime(myDate.Year, myDate.Month, myDate.Day);
DateTime date = DateTime.Now;
string Strdateonly = date.ToString("d");
var dateOnly = new DateTime(dateTime.Year, dateTime.Month, dateTime.Day)
DateTime dt = DateTime.now;
String BirthDate = dt.ToShortDateString();
using System;
public struct DateOnly : IComparable, IFormattable, IComparable<DateOnly>, IEquatable<DateOnly>
{
private DateTime _dateValue;
public int CompareTo(object obj)
{
if (obj == null)
{
return 1;
}
DateOnly otherDateOnly = (DateOnly)obj;
if (otherDateOnly != null)
{
return ToDateTime().CompareTo(otherDateOnly.ToDateTime());
}
else
{
throw new ArgumentException("Object is not a DateOnly");
}
}
int IComparable<DateOnly>.CompareTo(DateOnly other)
{
return this.CompareToOfT(other);
}
public int CompareToOfT(DateOnly other)
{
// If other is not a valid object reference, this instance is greater.
if (other == new DateOnly())
{
return 1;
}
return this.ToDateTime().CompareTo(other.ToDateTime());
}
bool IEquatable<DateOnly>.Equals(DateOnly other)
{
return this.EqualsOfT(other);
}
public bool EqualsOfT(DateOnly other)
{
if (other == new DateOnly())
{
return false;
}
if (this.Year == other.Year && this.Month == other.Month && this.Day == other.Day)
{
return true;
}
else
{
return false;
}
}
public static DateOnly Now()
{
return new DateOnly(DateTime.Now.Year, DateTime.Now.Month, DateTime.Now.Day);
}
public static bool TryParse(string s, ref DateOnly result)
{
DateTime dateValue = default(DateTime);
if (DateTime.TryParse(s, out dateValue))
{
result = new DateOnly(dateValue.Year, dateValue.Month, dateValue.Day);
return true;
}
else
{
return false;
}
}
public static DateOnly Parse(string s)
{
DateTime dateValue = default(DateTime);
dateValue = DateTime.Parse(s);
return new DateOnly(dateValue.Year, dateValue.Month, dateValue.Day);
}
public static DateOnly ParseExact(string s, string format)
{
CultureInfo provider = CultureInfo.InvariantCulture;
DateTime dateValue = default(DateTime);
dateValue = DateTime.ParseExact(s, format, provider);
return new DateOnly(dateValue.Year, dateValue.Month, dateValue.Day);
}
public DateOnly(int yearValue, int monthValue, int dayValue) : this()
{
Year = yearValue;
Month = monthValue;
Day = dayValue;
}
public DateOnly AddDays(double value)
{
DateTime d = new DateTime(this.Year, this.Month, this.Day);
d = d.AddDays(value);
return new DateOnly(d.Year, d.Month, d.Day);
}
public DateOnly AddMonths(int months)
{
DateTime d = new DateTime(this.Year, this.Month, this.Day);
d = d.AddMonths(months);
return new DateOnly(d.Year, d.Month, d.Day);
}
public DateOnly AddYears(int years)
{
DateTime d = new DateTime(this.Year, this.Month, this.Day);
d = d.AddYears(years);
return new DateOnly(d.Year, d.Month, d.Day);
}
public DayOfWeek DayOfWeek
{
get
{
return _dateValue.DayOfWeek;
}
}
public DateTime ToDateTime()
{
return _dateValue;
}
public int Year
{
get
{
return _dateValue.Year;
}
set
{
_dateValue = new DateTime(value, Month, Day);
}
}
public int Month
{
get
{
return _dateValue.Month;
}
set
{
_dateValue = new DateTime(Year, value, Day);
}
}
public int Day
{
get
{
return _dateValue.Day;
}
set
{
_dateValue = new DateTime(Year, Month, value);
}
}
public static bool operator == (DateOnly aDateOnly1, DateOnly aDateOnly2)
{
return (aDateOnly1.ToDateTime() == aDateOnly2.ToDateTime());
}
public static bool operator != (DateOnly aDateOnly1, DateOnly aDateOnly2)
{
return (aDateOnly1.ToDateTime() != aDateOnly2.ToDateTime());
}
public static bool operator > (DateOnly aDateOnly1, DateOnly aDateOnly2)
{
return (aDateOnly1.ToDateTime() > aDateOnly2.ToDateTime());
}
public static bool operator < (DateOnly aDateOnly1, DateOnly aDateOnly2)
{
return (aDateOnly1.ToDateTime() < aDateOnly2.ToDateTime());
}
public static bool operator >= (DateOnly aDateOnly1, DateOnly aDateOnly2)
{
return (aDateOnly1.ToDateTime() >= aDateOnly2.ToDateTime());
}
public static bool operator <= (DateOnly aDateOnly1, DateOnly aDateOnly2)
{
return (aDateOnly1.ToDateTime() <= aDateOnly2.ToDateTime());
}
public static TimeSpan operator - (DateOnly aDateOnly1, DateOnly aDateOnly2)
{
return (aDateOnly1.ToDateTime() - aDateOnly2.ToDateTime());
}
public override string ToString()
{
return _dateValue.ToShortDateString();
}
public string ToString(string format)
{
return _dateValue.ToString(format);
}
public string ToString(string fmt, IFormatProvider provider)
{
return string.Format("{0:" + fmt + "}", _dateValue);
}
public string ToShortDateString()
{
return _dateValue.ToShortDateString();
}
public string ToDbFormat()
{
return string.Format("{0:yyyy-MM-dd}", _dateValue);
}
}
DateTime todaysDate = DateTime.UtcNow;
string dateString = String.Format("{0:dd/MM/yyyy}", todaysDate);
Console.WriteLine("Date with Time: "+ todaysDate.ToString());
Console.WriteLine("Date Only : " + dateString);
Date with Time: 9/4/2016 11:42:16 AM
Date Only : 04/09/2016
var date = DateTime.Now
var shortDate = date.ToShortDateString() //will give you 16/01/2019
var date = DateTime.Now
var shortDate = date.ToString('dd-MMM-yyyy') //will give you 16-Jan-2019
var date = DateTime.Now.ToShortDateString();