82 lines
2.9 KiB
C#
82 lines
2.9 KiB
C#
using System;
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namespace WalkingTec.Mvvm.Core.Extensions
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{
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/// <summary>
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/// DateTime Helper
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/// </summary>
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public static class DateTimeHelper
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{
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#region DateTime Helper
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public static int WeekOfYear(this DateTime self)
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{
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var startDayOfYear = new DateTime(self.Year,1,1);
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var weekOffset = 7 - ( startDayOfYear.DayOfWeek == DayOfWeek.Sunday ? 7 : (int)startDayOfYear.DayOfWeek) + 1;
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var weekOfYear = (int)Math.Ceiling((self.DayOfYear - weekOffset) / 7.0 + (weekOffset == 0 ? 0 : 1));
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return weekOfYear;
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}
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/// <summary>
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/// 获取 指定的一周所在年份 的开始及结束时间
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/// </summary>
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/// <param name="yearNum">所在年份</param>
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/// <param name="weekOfYear">周数</param>
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/// <param name="startDay">指定周开始时间</param>
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/// <param name="endDay">指定周结束时间</param>
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public static void WeekDays(int yearNum, int weekOfYear, out DateTime startDay, out DateTime endDay)
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{
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var startDayOfYear = new DateTime(yearNum,1,1,0,0,0);
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var weekOffset = 7 - ( startDayOfYear.DayOfWeek == DayOfWeek.Sunday ? 7 : (int)startDayOfYear.DayOfWeek) + 1;
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startDay = startDayOfYear.AddDays(7 * (weekOfYear - (weekOffset == 0 ? 0 : 1)) + weekOffset - 7);
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endDay = startDay.AddDays(7);
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}
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#endregion
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#region DateTime Extensions
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private static readonly DateTime _jan1st1970 = new DateTime(1970, 1, 1, 0, 0, 0,DateTimeKind.Utc);
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/// <summary>
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/// UTC 1970/01/01 00:00:00
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/// </summary>
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public static DateTime Jan1st1970 => _jan1st1970;
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/// <summary>
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/// 时间戳 ms
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/// </summary>
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/// <param name="self"></param>
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/// <returns>返回标准时间戳 单位 毫秒 注：从 1970/01/01 00:00:00 开始</returns>
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public static long ToMilliseconds(this DateTime self)
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{
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return (long)(self.ToUniversalTime() - Jan1st1970).TotalMilliseconds;
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}
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/// <summary>
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/// 时间戳 microsecond
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/// </summary>
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/// <param name="self"></param>
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/// <returns>返回标准时间戳 单位 微秒 注：从 1970/01/01 00:00:00 开始</returns>
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public static long ToMicroseconds(this DateTime self)
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{
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return (long)((self.ToUniversalTime() - Jan1st1970).TotalMilliseconds * 1000);
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}
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/// <summary>
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/// 获取当前时间所在周的开始及结束时间
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/// </summary>
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/// <param name="self"></param>
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/// <param name="startDay">指定周开始时间</param>
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/// <param name="endDay">指定周结束时间</param>
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public static void WeekDays(this DateTime self, out DateTime startDay, out DateTime endDay)
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{
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WeekDays(self.Year, self.WeekOfYear(), out startDay, out endDay);
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}
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#endregion
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}
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}
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