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C# 常用日期取得

date turn 常用 OS span value pan int ati

列舉一下常用的日期取得方法

    static class DateTimeDemo
    {
        public static DateTime FirstDayOfMonth(this DateTime value)
        {
            return new DateTime(value.Year, value.Month, 1);
        }
        public static DateTime LastDayOfMonth(this DateTime value)
        {
            return value.FirstDayOfMonth().AddMonths(1
).AddDays(-1); } public static DateTime LastSecondOfDay(this DateTime value) { return value.Date.AddDays(1).AddSeconds(-1); } public static DateTime FirstDayOfLastMonth(this DateTime value) { return value.FirstDayOfMonth().AddMonths(-1
); } public static int DaysInMonth(this DateTime value) { return DateTime.DaysInMonth(value.Year, value.Month); } public static DateTime DayOfYear(int month, int day) { return new DateTime(DateTime.Now.Year, month, day); }
public static DateTime DayOfNextMonth(this DateTime value, int month) { return value.AddMonths(month).AddDays(-1); } public static DateTime StartOfDay(this DateTime theDate) { return theDate.Date; } public static DateTime EndOfDay(this DateTime theDate) { return theDate.Date.AddDays(1).AddTicks(-1); } public static DateTime QuarterStart(this DateTime dt) { return dt.AddMonths(0 - (dt.Month - 1) % 3).AddDays(1 - dt.Day); } public static DateTime QuarterEnd(this DateTime dt) { return dt.QuarterStart().AddMonths(3).AddDays(-1); } }

測試結果:

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C# 常用日期取得