C# DATETIME格式转换汇总 根据日期过期星期
C#
DateTime.Now.Year –2019(年)
DateTime.Now.Month –9（月）
DateTime.Now.Day –19（日）
DateTime.Now.Hour –13(时)
DateTime.Now.Minute –06(分)
DateTime.Now.Second –32(秒)
DateTime.Now.DayOfWeek –4 (星期4)
DateTime.Now.DayOfYear –262 (本年的第多少天)
DateTime.Now.ToString() –“2019-09-19 11:16:40”
DateTime.Now.ToLocalTime().ToString() –“2019-09-19 11:16:40”
DateTime.Now.ToLongDateString() –“2019年9月19日”
DateTime.Now.ToShortDateString() –“2019/9/19”
DateTime.Now.Date –“2019-09-19 00:00:00”
DateTime.Now.Date.ToString() –“2019/9/19 0:00:00”
DateTime.Now.ToLongTimeString() — “13:06:21”
DateTime.Now.ToShortTimeString() –“13:06”
DateTime.Now.TimeOfDay.ToString() –“13:06:31.9957275”
DateTime.Now.ToString(“yyyy-MM-dd”) –2019-09-19 (MM为月、 mm为分)
DateTime.Now.ToString(“yy-MM-dd”) –19-09-19
DateTime.Now.ToString(“yy-M-d”) –19-9-19
DateTime.Now.ToString(“yyyy/MM/dd”) –2019/09/19
DateTime.Now.ToString(“yyyy-MM-dd hh:mm:ss”) –2019-09-19 01:31:26
DateTime.Now.ToString(“yyyy-MM-dd HH:mm:ss”) –2019-09-19 13:31:26
DateTime.Now.AddYears(1) –当前时间加一年
DateTime.Now.AddMonths(1) –当前时间加一月
DateTime.Now.AddDays(1) –当前时间加一天
DateTime.Now.AddHours(1) –当前时间加1小时
DateTime.Now.AddMinutes（1） –当前时间加1分钟
C#根据日期，获得星期几
/// <summary>根据日期，获得星期几</summary>
/// <param name=”y”>年</param>
/// <param name=”m”>月</param>
/// <param name=”d”>日</param>
/// <returns>星期几，1代表星期一；7代表星期日</returns>
public static int getWeekDay(int y, int m, int d)
{
if (m == 1) m = 13;
if (m == 2) m = 14;
int week = (d + 2 * m + 3 * (m + 1) / 5 + y + y / 4 – y / 100 + y / 400) % 7 + 1;
return week;
}
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