C# 当前时间表达
DateTime
獲得當(dāng)前系統(tǒng)時間: DateTime dt = DateTime.Now;
Environment.TickCount可以得到“系統(tǒng)啟動到現(xiàn)在”的毫秒值
DateTime now = DateTime.Now;
Console.WriteLine(now.ToString("yyyy-MM-dd"));??//按yyyy-MM-dd格式輸出s
Console.WriteLine(dt.ToString());????//? 26/11/2009 AM 11:21:30
Console.WriteLine(dt.ToFileTime().ToString());???// ??129036792908014024
// Converts the value of the current System.DateTime object to a Windows file time
Console.WriteLine(dt.ToFileTimeUtc().ToString());??//???? 129036792908014024
// Converts the value of the current System.DateTime object to a Windows file time
Console.WriteLine(dt.ToLocalTime().ToString());???//?????? 26/11/2009 AM 11:21:30
// Converts the value of the current System.DateTime object to local time.
Console.WriteLine(dt.ToLongDateString().ToString());???//????? 2009年11月26日
Console.WriteLine(dt.ToLongTimeString().ToString());??//????? AM 11:21:30
Console.WriteLine(dt.ToOADate().ToString());???//????? 40143.4732731597
Console.WriteLine(dt.ToShortDateString().ToString());???//???? 26/11/2009
Console.WriteLine(dt.ToShortTimeString().ToString());???//???? AM 11:21
Console.WriteLine(dt.ToUniversalTime().ToString());???//?????? 26/11/2009 AM 3:21:30
Console.WriteLine(dt.Year.ToString());???//??????? 2009
Console.WriteLine(dt.Date.ToString());???//??????? 26/11/2009 AM 12:00:00
Console.WriteLine(dt.DayOfWeek.ToString());??//?????? Thursday
Console.WriteLine(dt.DayOfYear.ToString());???//?????? 330
Console.WriteLine(dt.Hour.ToString());???????//??????? 11
Console.WriteLine(dt.Millisecond.ToString());???//???? 801??????? (毫秒)
Console.WriteLine(dt.Minute.ToString());???//????? 21
Console.WriteLine(dt.Month.ToString());???//?????? 11
Console.WriteLine(dt.Second.ToString());???//????? 30
Console.WriteLine(dt.Ticks.ToString());???//?????? 633948312908014024
Console.WriteLine(dt.TimeOfDay.ToString());???//?????? 12:29:51.5181524
// Gets the time of day for this instance.
// 返回 A System.TimeSpan that represents the fraction of the day that has elapsed since midnight.
Console.WriteLine(dt.ToString());?????//?? ??26/11/2009 PM 12:29:51
Console.WriteLine(dt.AddYears(1).ToString());????//???? ????26/11/2010 PM 12:29:51
Console.WriteLine(dt.AddDays(1.1).ToString());????//??????? 27/11/2009 PM 2:53:51
Console.WriteLine(dt.AddHours(1.1).ToString());????//?????? 26/11/2009 PM 1:35:51
Console.WriteLine(dt.AddMilliseconds(1.1).ToString());????//26/11/2009 PM 12:29:51
Console.WriteLine(dt.AddMonths(1).ToString());????//??????? 26/12/2009 PM 12:29:51
Console.WriteLine(dt.AddSeconds(1.1).ToString());????//???? 26/11/2009 PM 12:29:52
Console.WriteLine(dt.AddMinutes(1.1).ToString());????//???? 26/11/2009 PM 12:30:57
Console.WriteLine(dt.AddTicks(1000).ToString());????//????? 26/11/2009 PM 12:29:51
Console.WriteLine(dt.CompareTo(dt).ToString());????//?????? 0
Console.WriteLine(dt.Add(new TimeSpan(1,0,0,0)).ToString());????// 加上一個時間段
(注:
System.TimeSpan為一個時間段,構(gòu)造函數(shù)如下
public TimeSpan(long ticks);?// ticks: A time period expressed in 100-nanosecond units.
??????????????????????? ???//nanosecond:十億分之一秒?? new TimeSpan(10,000,000)??????? 為一秒
public TimeSpan(int hours, int minutes, int seconds);
public TimeSpan(int days, int hours, int minutes, int seconds);
public TimeSpan(int days, int hours, int minutes, int seconds, int milliseconds);
)
Console.WriteLine(dt.Equals("2005-11-6 16:11:04").ToString());?????//??????? False
Console.WriteLine(dt.Equals(dt).ToString());????//????? True
Console.WriteLine(dt.GetHashCode().ToString());????//?????? 1103291775
Console.WriteLine(dt.GetType().ToString());????//?????? System.DateTime
Console.WriteLine(dt.GetTypeCode().ToString());????//?????? DateTime
??
long Start = Environment.TickCount;???//單位是毫秒
long End = Environment.TickCount;
Console.WriteLine("Start is : "+Start);
Console.WriteLine("End is : "+End);
Console.WriteLine("The Time is {0}",End-Start);
Console.WriteLine(dt.GetDateTimeFormats('s')[0].ToString());????//2009-11-26T13:29:06
Console.WriteLine(dt.GetDateTimeFormats('t')[0].ToString());????//PM 1:29
Console.WriteLine(dt.GetDateTimeFormats('y')[0].ToString());????//2009年11月
Console.WriteLine(dt.GetDateTimeFormats('D')[0].ToString());????//2009年11月26日
Console.WriteLine(dt.GetDateTimeFormats('D')[1].ToString());????//星期四, 26 十一月, 2009
Console.WriteLine(dt.GetDateTimeFormats('D')[2].ToString());????//26 十一月, 2009
Console.WriteLine(dt.GetDateTimeFormats('D')[3].ToString());????//星期四 2009 11 26
Console.WriteLine(dt.GetDateTimeFormats('M')[0].ToString());????//26 十一月
Console.WriteLine(dt.GetDateTimeFormats('f')[0].ToString());????//2009年11月26日 PM 1:29
Console.WriteLine(dt.GetDateTimeFormats('g')[0].ToString());????//26/11/2009 PM 1:29
Console.WriteLine(dt.GetDateTimeFormats('r')[0].ToString());????//Thu, 26 Nov 2009 13:29:06 GMT
(注:
常用的日期時間格式:
格式?說明??????輸出格式?
d 精簡日期格式 MM/dd/yyyy?
D 詳細(xì)日期格式 dddd, MMMM dd, yyyy?
f ?完整格式 ???(long date + short time) dddd, MMMM dd, yyyy HH:mm?
F 完整日期時間格式 (long date + long time) dddd, MMMM dd, yyyy HH:mm:ss?
g 一般格式 (short date + short time) MM/dd/yyyy HH:mm?
G 一般格式 (short date + long time) MM/dd/yyyy HH:mm:ss?
m,M 月日格式 MMMM dd?
s 適中日期時間格式 yyyy-MM-dd HH:mm:ss?
t 精簡時間格式 HH:mm?
T 詳細(xì)時間格式 HH:mm:ss
)
Console.WriteLine(string.Format("{0:d}", dt));????//28/12/2009
Console.WriteLine(string.Format("{0:D}", dt));????//2009年12月28日
Console.WriteLine(string.Format("{0:f}", dt));????//2009年12月28日 AM 10:29
Console.WriteLine(string.Format("{0:F}", dt));????//2009年12月28日 AM 10:29:18
Console.WriteLine(string.Format("{0:g}", dt));????//28/12/2009 AM 10:29
Console.WriteLine(string.Format("{0:G}", dt));????//28/12/2009 AM 10:29:18
Console.WriteLine(string.Format("{0:M}", dt));????//28 十二月
Console.WriteLine(string.Format("{0:R}", dt));????//Mon, 28 Dec 2009 10:29:18 GMT
Console.WriteLine(string.Format("{0:s}", dt));????//2009-12-28T10:29:18
Console.WriteLine(string.Format("{0:t}", dt));????//AM 10:29
Console.WriteLine(string.Format("{0:T}", dt));????//AM 10:29:18
Console.WriteLine(string.Format("{0:u}", dt));????//2009-12-28 10:29:18Z
Console.WriteLine(string.Format("{0:U}", dt));????//2009年12月28日 AM 2:29:18
Console.WriteLine(string.Format("{0:Y}", dt));????//2009年12月
Console.WriteLine(string.Format("{0}", dt));????//28/12/2009 AM 10:29:18
Console.WriteLine(string.Format("{0:yyyyMMddHHmmssffff}", dt));????//200912281029182047
計算2個日期之間的天數(shù)差
DateTime dt1 = Convert.ToDateTime("2007-8-1");????
DateTime dt2 = Convert.ToDateTime("2007-8-15");???
TimeSpan span = dt2.Subtract(dt1);??????????????
int dayDiff = span.Days ;????????????????????
計算某年某月的天數(shù)
int days = DateTime.DaysInMonth(2009, 8);???????
days = 31;??????????????????????????????????????
給日期增加一天、減少一天
DateTime dt =DateTime.Now;
dt.AddDays(1); //增加一天 dt本身并不改變
dt.AddDays(-1);//減少一天 dt本身并不改變
轉(zhuǎn)載于:https://www.cnblogs.com/zyh-C/p/9550827.html
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