C#工具类之日期扩展类
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/// <summary> /// DateTimeHelper /// </summary> public static class DateTimeHelper { /// <summary> /// Unix时间起始时间 /// </summary> public static readonly DateTime StarTime = new DateTime(1970, 1, 1); /// <summary> /// 常用日期格式 /// </summary> public static readonly string CommonDateFormat = "yyyy-MM-dd HH:mm:ss.fff"; /// <summary> /// 周未定义 /// </summary> public static readonly DayOfWeek[] Weekend = { DayOfWeek.Saturday, DayOfWeek.Sunday }; /// <summary> /// 获取从Unix起始时间到给定时间的毫秒数 /// </summary> /// <param name="datetime"></param> /// <returns></returns> public static long GetMillisecondsSince1970(this DateTime datetime) { var ts = datetime.Subtract(StarTime); return (long)ts.TotalMilliseconds; } /// <summary> /// 获取从Unix起始时间到给定时间的秒数 /// </summary> /// <param name="datetime"></param> /// <returns></returns> public static long GetSecondsSince1970(this DateTime datetime) { var ts = datetime.Subtract(StarTime); return (long)ts.TotalSeconds; } /// <summary> /// 明天 /// </summary> /// <param name="date"></param> /// <returns></returns> public static DateTime Tomorrow(this DateTime date) { return date.AddDays(1); } /// <summary> /// 昨天 /// </summary> /// <param name="date"></param> /// <returns></returns> public static DateTime Yesterday(this DateTime date) { return date.AddDays(-1); } /// <summary> /// 常用日期格式化字符串 /// </summary> /// <param name="date"></param> /// <returns></returns> public static string ToCommonFormat(this DateTime date) { return date.ToString(CommonDateFormat); } /// <summary> /// 是否是周未 /// </summary> /// <param name="date"></param> /// <returns></returns> public static bool IsWeekend(this DateTime date) { return Weekend.Any(p => p == date.DayOfWeek); } /// <summary> /// 是否是工作日 /// </summary> /// <param name="date"></param> /// <returns></returns> public static bool IsWeekDay(this DateTime date) { return !date.IsWeekend(); } /// <summary> /// 给定月份的第1天 /// </summary> /// <param name="date"></param> /// <returns></returns> public static DateTime GetFirstDayOfMonth(this DateTime date) { return new DateTime(date.Year, date.Month, 1); } /// <summary> /// 给定月份的最后1天 /// </summary> /// <param name="date"></param> /// <returns></returns> public static DateTime GetLastDayOfMonth(this DateTime date) { return date.GetFirstDayOfMonth().AddMonths(1).AddDays(-1); } /// <summary> /// 给定日期所在月份第1个星期几所对应的日期 /// </summary> /// <param name="date">给定日期</param> /// <param name="dayOfWeek">星期几</param> /// <returns>所对应的日期</returns> public static DateTime GetFirstWeekDayOfMonth(this DateTime date, DayOfWeek dayOfWeek) { var dt = date.GetFirstDayOfMonth(); while (dt.DayOfWeek != dayOfWeek) dt = dt.AddDays(1); return dt; } /// <summary> /// 给定日期所在月份最后1个星期几所对应的日期 /// </summary> /// <param name="date">给定日期</param> /// <param name="dayOfWeek">星期几</param> /// <returns>所对应的日期</returns> public static DateTime GetLastWeekDayOfMonth(this DateTime date, DayOfWeek dayOfWeek) { var dt = date.GetLastDayOfMonth(); while (dt.DayOfWeek != dayOfWeek) dt = dt.AddDays(-1); return dt; } /// <summary> /// 早于给定日期 /// </summary> /// <param name="date"></param> /// <param name="other"></param> /// <returns></returns> public static bool IsBefore(this DateTime date, DateTime other) { return date.CompareTo(other) < 0; } /// <summary> /// 晚于给定日期 /// </summary> /// <param name="date"></param> /// <param name="other"></param> /// <returns></returns> public static bool IsAfter(this DateTime date, DateTime other) { return date.CompareTo(other) > 0; } /// <summary> /// 给定日期最后一刻,精确到23:59:59.999 /// </summary> /// <param name="date"></param> /// <returns></returns> public static DateTime EndTimeOfDay(this DateTime date) { return new DateTime(date.Year, date.Month, date.Day, 23, 59, 59, 999); } /// <summary> /// 给定日期开始一刻,精确到0:0:0.0 /// </summary> /// <param name="date"></param> /// <returns></returns> public static DateTime StartTimeOfDay(this DateTime date) { return date.Date; } /// <summary> /// 给定日期的中午,精确到12:0:0.0 /// </summary> /// <param name="date"></param> /// <returns></returns> public static DateTime NoonOfDay(this DateTime date) { return new DateTime(date.Year, date.Month, date.Day, 12, 0, 0); } /// <summary> /// 当前日期与给定日期是否是同一天 /// </summary> /// <param name="date">当前日期</param> /// <param name="dateToCompare">给定日期</param> /// <returns></returns> public static bool IsDateEqual(this DateTime date, DateTime dateToCompare) { return (date.Date == dateToCompare.Date); } /// <summary> /// 判断是否为今天 /// </summary> /// <param name="date"></param> /// <returns></returns> public static bool IsToday(this DateTime date) { return (date.Date == DateTime.Now.Date); } /// <summary> /// 给定日期所在月份共有多少天 /// </summary> /// <param name="date"></param> /// <returns></returns> public static int GetCountDaysOfMonth(this DateTime date) { return date.GetLastDayOfMonth().Day; } }
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