C# 如何在.NET中的DST时间内获取UTC偏移量
我试图在一个时区内,在一段时间间隔内看到所有偏移量。下面是我用来完成此任务的函数,我知道您可以使用C# 如何在.NET中的DST时间内获取UTC偏移量,c#,.net,datetime,utc,dst,C#,.net,Datetime,Utc,Dst,我试图在一个时区内,在一段时间间隔内看到所有偏移量。下面是我用来完成此任务的函数,我知道您可以使用TimeZoneInfo.BaseUtcOffset在标准时间内获取时区的UTC偏移量,但在夏令时没有类似的方法来获取偏移量,除非您将特定的DST时间点传递给GetUTCOffset()方法 static void GetOffsets(DateTime startTime, DateTime endTime, TimeZoneInfo tz) { var result = new Hash
TimeZoneInfo.BaseUtcOffset
在标准时间内获取时区的UTC偏移量
,但在夏令时没有类似的方法来获取偏移量,除非您将特定的DST
时间点传递给GetUTCOffset()
方法
static void GetOffsets(DateTime startTime, DateTime endTime, TimeZoneInfo tz)
{
var result = new HashSet<int>();
var adjRules = tz.GetAdjustmentRules();
result.Add(tz.BaseUtcOffset);
foreach (var adjustmentRule in adjRules)
{
if ((startTime >= adjustmentRule.DateStart && startTime <= adjustmentRule.DateEnd) || (endTime >= adjustmentRule.DateStart && endTime <= adjustmentRule.DateEnd) ||
(stTime <= adjustmentRule.DateStart && endTime >= adjustmentRule.DateEnd))
{
if(adjustmentRule.DaylightDelta != TimeSpan.Zero)
{
if (!result.Contains(tz.BaseUtcOffset + adjustmentRule.DaylightDelta))
result.Add((tz.BaseUtcOffset + adjustmentRule.DaylightDelta));
}
}
}
foreach (var res in result)
{
Console.WriteLine(res);
}
}
static void getoffset(DateTime startTime、DateTime endTime、TimeZoneInfo tz)
{
var result=new HashSet();
var adjRules=tz.GetAdjustmentRules();
结果。添加(tz.BaseUtcOffset);
foreach(调整规则中的var调整规则)
{
如果((startTime>=adjustmentRule.DateStart&&startTime=adjustmentRule.DateStart&&endTime如果您正在做任何与日期有关的复杂事情,您应该查看一下(这是Joda Time Java库的一个端口)。它有一个完整的名称空间来处理棘手的时区问题。我确实想出了这个方法来获得在指定时区信息的一年时间间隔内UTC间隔需要考虑的偏移量。我将此集合传递到数据库,以过滤UTC中保存的日期时间字段,用于间隔过滤器输入,如(“凌晨1点-凌晨2点”),我对系统中的所有时区都进行了测试,效果很好。虽然这不是我最初问题的答案,因为我仍在使用调整规则来获取偏移量,但这次我尝试使其可用
class Program
{
static void Main(string[] args)
{
foreach (var tz in TimeZoneInfo.GetSystemTimeZones())
{
var result = GetUTCOffsetsByUTCIntervals(1900, 2012, tz);
Console.WriteLine(tz.DisplayName);
foreach (var tuple in result)
{
Console.WriteLine(tuple.Item1 + " " + tuple.Item2 + " " + tuple.Item3);
}
Console.WriteLine("------------------------------------------------------------");
}
Console.Read();
}
public static List<Tuple<TimeSpan, DateTime, DateTime>> GetUTCOffsetsByUTCIntervals(int stYear, int endYear, TimeZoneInfo tz)
{
var cal = CultureInfo.CurrentCulture.Calendar;
var offsetsByUTCIntervals = new List<Tuple<TimeSpan, DateTime, DateTime>>();
var adjRules = tz.GetAdjustmentRules();
for (var year = stYear; year <= endYear && year < DateTime.MaxValue.Year && year >= DateTime.MinValue.Year; year++)
{
var adjRule =
adjRules.FirstOrDefault(
rule =>
rule.DateStart.Year == year || rule.DateEnd.Year == year ||
(rule.DateStart.Year < year && rule.DateEnd.Year > year));
var yrStTime = new DateTime(year, 1, 1);
var yrEndTime = yrStTime.AddYears(1).AddTicks(-1);
if (adjRule != null)
{
var tStDate = GetTransitionDate(adjRule.DaylightTransitionStart, year);
var tEnddate = GetTransitionDate(adjRule.DaylightTransitionEnd, year);
var stTsp = adjRule.DaylightTransitionStart.TimeOfDay.TimeOfDay;
var endTsp = adjRule.DaylightTransitionEnd.TimeOfDay.TimeOfDay;
if (yrStTime.Date == tStDate && yrStTime.TimeOfDay == stTsp)
yrStTime = yrStTime.Add(adjRule.DaylightDelta);
if (yrEndTime.Date == tEnddate && yrEndTime.TimeOfDay == endTsp)
yrEndTime = yrEndTime.Subtract(adjRule.DaylightDelta);
if (tStDate.Month > tEnddate.Month)
{
offsetsByUTCIntervals.Add(new Tuple<TimeSpan, DateTime, DateTime>(tz.BaseUtcOffset + adjRule.DaylightDelta, ConvertTimeToUtc(yrStTime, tz), ConvertTimeToUtc(tEnddate.AddTicks(endTsp.Ticks - 1), tz)));
offsetsByUTCIntervals.Add(new Tuple<TimeSpan, DateTime, DateTime>(tz.BaseUtcOffset, ConvertTimeToUtc(tEnddate.Add(endTsp.Subtract(adjRule.DaylightDelta)), tz), ConvertTimeToUtc(tStDate.AddTicks(stTsp.Ticks - 1), tz)));
offsetsByUTCIntervals.Add(new Tuple<TimeSpan, DateTime, DateTime>(tz.BaseUtcOffset + adjRule.DaylightDelta, ConvertTimeToUtc(tStDate.Add(stTsp.Add(adjRule.DaylightDelta)), tz), ConvertTimeToUtc(yrEndTime, tz)));
}
else
{
offsetsByUTCIntervals.Add(new Tuple<TimeSpan, DateTime, DateTime>(tz.BaseUtcOffset, ConvertTimeToUtc(yrStTime, tz), ConvertTimeToUtc(tStDate.AddTicks(stTsp.Ticks - 1), tz)));
offsetsByUTCIntervals.Add(new Tuple<TimeSpan, DateTime, DateTime>(tz.BaseUtcOffset + adjRule.DaylightDelta, ConvertTimeToUtc(tStDate.Add(stTsp.Add(adjRule.DaylightDelta)), tz), ConvertTimeToUtc(tEnddate.AddTicks(endTsp.Ticks - 1), tz)));
offsetsByUTCIntervals.Add(new Tuple<TimeSpan, DateTime, DateTime>(tz.BaseUtcOffset, ConvertTimeToUtc(tEnddate.Add(endTsp.Subtract(adjRule.DaylightDelta)), tz), ConvertTimeToUtc(yrEndTime, tz)));
}
}
else
{
offsetsByUTCIntervals.Add(new Tuple<TimeSpan, DateTime, DateTime>(tz.BaseUtcOffset, ConvertTimeToUtc(yrStTime, tz), ConvertTimeToUtc(yrEndTime, tz)));
}
}
return offsetsByUTCIntervals;
}
public static DateTime ConvertTimeToUtc(DateTime date, TimeZoneInfo timeZone)
{
if (date == null || timeZone == null)
{
return date;
}
DateTime convertedDate = TimeZoneInfo.ConvertTimeToUtc(date, timeZone);
return convertedDate;
}
//copy from msdn http://msdn.microsoft.com/en-us/library/system.timezoneinfo.transitiontime.isfixeddaterule.aspx
private static DateTime GetTransitionDate(TimeZoneInfo.TransitionTime transition, int year)
{
if (transition.IsFixedDateRule)
return new DateTime(year, transition.Month, transition.Day);
int transitionDay;
var cal = CultureInfo.CurrentCulture.Calendar;
var startOfWeek = transition.Week * 7 - 6;
var firstDayOfWeek = (int)cal.GetDayOfWeek(new DateTime(year, transition.Month, 1));
var changeDayOfWeek = (int)transition.DayOfWeek;
if (firstDayOfWeek <= changeDayOfWeek)
transitionDay = startOfWeek + (changeDayOfWeek - firstDayOfWeek);
else
transitionDay = startOfWeek + (7 - firstDayOfWeek + changeDayOfWeek);
if (transitionDay > cal.GetDaysInMonth(year, transition.Month))
transitionDay -= 7;
return new DateTime(year, transition.Month, transitionDay);
}
/* static void GetOffsets(DateTime startTime, DateTime endTime, TimeZoneInfo tz)
{
var result = new HashSet<string>();
var adjRules = tz.GetAdjustmentRules();
result.Add(tz.BaseUtcOffset.ToString());
foreach (var adjustmentRule in adjRules)
{
if ((startTime >= adjustmentRule.DateStart && startTime <= adjustmentRule.DateEnd)
|| (endTime >= adjustmentRule.DateStart && endTime <= adjustmentRule.DateEnd)
|| (startTime <= adjustmentRule.DateStart && endTime >= adjustmentRule.DateEnd))
{
if(adjustmentRule.DaylightDelta != TimeSpan.Zero)
{
if (!result.Contains((tz.BaseUtcOffset + adjustmentRule.DaylightDelta).ToString()))
result.Add((tz.BaseUtcOffset + adjustmentRule.DaylightDelta).ToString());
}
}
}
Console.Write(tz.DisplayName + " ");
foreach (var res in result)
{
Console.Write(res);
}
}*/
}
类程序
{
静态void Main(字符串[]参数)
{
foreach(TimeZoneInfo.GetSystemTimeZones()中的var tz)
{
var结果=GetutcoffsetsbyutcInterval(1900、2012、tz);
Console.WriteLine(tz.DisplayName);
foreach(结果中的变量元组)
{
Console.WriteLine(tuple.Item1+“”+tuple.Item2+“”+tuple.Item3);
}
Console.WriteLine(“-------------------------------------------------------------------------------------”);
}
Console.Read();
}
公共静态列表getutcoffsetsbyutcinterval(int-stYear、int-endYear、TimeZoneInfo-tz)
{
var cal=CultureInfo.CurrentCulture.Calendar;
var offsetsbyutcinterval=新列表();
var adjRules=tz.GetAdjustmentRules();
对于(var year=stYear;year=DateTime.MinValue.year;year++)
{
var调整规则=
adj.FirstOrDefault(
规则=>
rule.DateStart.Year==Year | | rule.DateEnd.Year==Year||
(rule.DateStart.YearYear));
var yrStTime=新日期时间(年,1,1);
var yrEndTime=yrStTime.AddYears(1.AddTicks(-1);
如果(adjRule!=null)
{
var tStDate=GetTransitionDate(adjRule.DaylightTransitionStart,年份);
var tEnddate=GetTransitionDate(adjRule.DaylightTransitionEnd,年份);
var stTsp=adjRule.DaylightTransitionStart.TimeOfDay.TimeOfDay;
var endTsp=adjRule.DaylightTransitionEnd.TimeOfDay.TimeOfDay;
if(yrStTime.Date==tStDate&&yrStTime.TimeOfDay==stTsp)
yrStTime=yrStTime.Add(adjRule.DaylightDelta);
如果(yrEndTime.Date==tEnddate&&yrEndTime.TimeOfDay==endTsp)
yrEndTime=yrEndTime.Subtract(adjRule.DaylightDelta);
如果(tStDate.Month>tEnddate.Month)
{
添加(新元组(tz.BaseUtcOffset+adjRule.DaylightDelta,ConvertTimeToUtc(yrStTime,tz),ConvertTimeToUtc(tEnddate.AddTicks(endTsp.Ticks-1),tz));
Add(新元组(tz.BaseUtcOffset,ConvertTimeToUtc(tEnddate.Add(endTsp.Subtract(adjRule.DaylightDelta)),tz),ConvertTimeToUtc(tStDate.AddTicks(stTsp.Ticks-1),tz));
Add(新元组(tz.BaseUtcOffset+adjRule.DaylightDelta,ConvertTimeToUtc(tStDate.Add(stTsp.Add(adjRule.DaylightDelta)),tz),ConvertTimeToUtc(yrEndTime,tz));
}
其他的
{
Add(新元组(tz.BaseUtcOffset,ConvertTimeToUtc(yrStTime,tz),ConvertTimeToUtc(tStDate.AddTicks(stTsp.Ticks-1),tz));
Add(新元组(tz.BaseUtcOffset+adjRule.DaylightDelta),ConvertTimeToUtc(tStDate.Add(stTsp.Add(adjRule.DaylightDelta)),tz),ConvertTimeToUtc(tEnddate.AddTicks(endTsp.Ticks-1),tz));
Add(新元组(tz.BaseUtcOffset,ConvertTimeToUtc(tEnddate.Add(endTsp.Subtract(adjRule.DaylightDelta)),tz),ConvertTimeToUtc(yrEndTime,tz));
}
}
其他的
{
Add(新元组(tz.BaseUtcOffset,ConvertTimeToUtc(yrStTime,tz),ConvertTimeToUtc(yrEndTime,tz));
}
}
返回偏移量间隔;
}
公共静态日期时间转换器TimeToutc(日期时间日期,时区信息时区)
{
如果(日期==null | |时区==null)
{
返回日期;
}
DateTime convertedDate=TimeZoneInfo.ConvertTimeToUtc(日期,时区);
返回转换日期;
}
//从msdn复制http://msdn.microsoft.com/en-us/library/system.timezoneinfo.transitiontime.isfixeddaterule.aspx
私有静态日期时间GetTransitionDate(TimeZoneInfo.TransitionTime转换,整数年)
{
if(transition.IsFixedDateRule)
返回新的日期时间(年、过渡期、月、过渡期、日);
国际过渡日;
var cal=CultureInfo.CurrentCulture.Calendar;
var startOfWeek=过渡周*7-6;
var firstDayOfWeek=(int)cal.GetDayOfWeek(新的日期时间(年、转换月份、1));
var changeDayOfWeek=(int)transition.DayOfWeek;
if(每周第一天cal.GetDaysInMonth(年,过渡月
public IEnumerable<ZoneInterval> GetZoneIntervalsInInterval
(this DateTimeZone zone, Interval interval)
{
Instant current = interval.Start;
while (current < interval.End && current != Instant.MaxValue)
{
ZoneInterval zi = zone.GetZoneInterval(current);
yield return zi;
current = zi.End;
}
}
var zone = BclDateTimeZone.FromTimeZoneInfo(tzInfo);
var offsets = zone.GetZoneIntervalsInInterval(interval)
.Select(zi => zi.WallOffset)
.Distinct();