Home >Backend Development >C#.Net Tutorial >Detailed introduction to the method of converting date and time strings in C# string format to DateTime type
This article mainly introduces the method of converting date and time in C# string format String to DateTime type, which requires Friends can refer to
Method 1: Convert.ToDateTime(string)
The string format has requirements and must be yyyy-MM-dd hh:mm:ss
Method 2: Convert.ToDateTime(string, IFormatProvider)
DateTime dt; DateTimeFormatInfo dtFormat = new System.GlobalizationDateTimeFormatInfo(); dtFormat.ShortDatePattern = "yyyy/MM/dd"; dt = Convert.ToDateTime("2011/05/26", dtFormat);
Method 3: DateTime.ParseExact()
string dateString = "20110526"; DateTime dt = DateTime.ParseExact(dateString, "yyyyMMdd", System.Globalization.CultureInfo.CurrentCulture);
or
DateTime dt = DateTime.ParseExact(dateString, "yyyyMMdd", System.Globalization.CultureInfo.InvariantCulture);
Attached reference information:
CultureInfo cultureInfo = CultureInfo.CreateSpec if icCulture("en-US"); string format = "ddd MMM d HH:mm:ss zz00 yyyy"; string stringValue = DateTime.Now.ToString(format, cultureInfo); // 得到日期字符串 DateTime datetime = DateTime.ParseExact("Wed Aug 25 16:28:03 +0800 2010", format, cultureInfo); // 将字符串转换成日期
Others
Date format: yyyyMMdd HH:mm:ss (note the length of this string Letter case is very strict)
yyyy: represents the year
MM: represents the month
dd: represents the day
HH: represents the hour (24-hour format)
mm: represents the minute
ss : Represents seconds
DateTime.Now.ToShortTimeString() DateTime dt = DateTime.Now; dt.ToString();//2005-11-5 13:21:25 dt.ToFileTime().ToString();//127756416859912816 dt.ToFileTimeUtc().ToString();//127756704859912816 dt.ToLocalTime().ToString();//2005-11-5 21:21:25 dt.ToLongDateString().ToString();//2005年11月5日 dt.ToLongTimeString().ToString();//13:21:25 dt.ToOADate().ToString();//38661.5565508218 dt.ToShortDateString().ToString();//2005-11-5 dt.ToShortTimeString().ToString();//13:21 dt.ToUniversalTime().ToString();//2005-11-5 5:21:25 dt.Year.ToString();//2005 dt.Date.ToString();//2005-11-5 0:00:00 dt.DayOfWeek.ToString();//Saturday dt.DayOfYear.ToString();//309 dt.Hour.ToString();//13 dt.Millisecond.ToString();//441 dt.Minute.ToString();//30 dt.Month.ToString();//11 dt.Second.ToString();//28 dt.Ticks.ToString();//632667942284412864 dt.TimeOfDay.ToString();//13:30:28.4412864 dt.ToString();//2005-11-5 13:47:04 dt.AddYears(1).ToString();//2006-11-5 13:47:04 dt.AddDays(1.1).ToString();//2005-11-6 16:11:04 dt.AddHours(1.1).ToString();//2005-11-5 14:53:04 dt.AddMilliseconds(1.1).ToString();//2005-11-5 13:47:04 dt.AddMonths(1).ToString();//2005-12-5 13:47:04 dt.AddSeconds(1.1).ToString();//2005-11-5 13:47:05 dt.AddMinutes(1.1).ToString();//2005-11-5 13:48:10 dt.AddTicks(1000).ToString();//2005-11-5 13:47:04 dt.CompareTo(dt).ToString();//0 dt.Add(?).ToString();//问号为一个时间段 dt.Equals("2005-11-6 16:11:04").ToString();//False dt.Equals(dt).ToString();//True dt.GetHashCode().ToString();//1474088234 dt.GetType().ToString();//System.DateTime dt.GetTypeCode().ToString();//DateTime
dt.GetDateTimeFormats('s')[0].ToString();//2005-11-05T14:06:25 dt.GetDateTimeFormats('t')[0].ToString();//14:06 dt.GetDateTimeFormats('y')[0].ToString();//2005年11月 dt.GetDateTimeFormats('D')[0].ToString();//2005年11月5日 dt.GetDateTimeFormats('D')[1].ToString();//2005 11 05 dt.GetDateTimeFormats('D')[2].ToString();//星期六 2005 11 05 dt.GetDateTimeFormats('D')[3].ToString();//星期六 2005年11月5日 dt.GetDateTimeFormats('M')[0].ToString();//11月5日 dt.GetDateTimeFormats('f')[0].ToString();//2005年11月5日 14:06 dt.GetDateTimeFormats('g')[0].ToString();//2005-11-5 14:06 dt.GetDateTimeFormats('r')[0].ToString();//Sat, 05 Nov 2005 14:06:25 GMT
string.Format("{0:d}",dt);//2005-11-5 string.Format("{0}",dt);//2005年11月5日 string.Format("{0:f}",dt);//2005年11月5日 14:23 string.Format("{0:F}",dt);//2005年11月5日 14:23:23 string.Format("{0:g}",dt);//2005-11-5 14:23 string.Format("{0:G}",dt);//2005-11-5 14:23:23 string.Format("{0:M}",dt);//11月5日 string.Format("{0:R}",dt);//Sat, 05 Nov 2005 14:23:23 GMT string.Format("{0:s}",dt);//2005-11-05T14:23:23 string.Format("{0:t}",dt);//14:23 string.Format("{0:T}",dt);//14:23:23 string.Format("{0:u}",dt);//2005-11-05 14:23:23Z string.Format("{0:U}",dt);//2005年11月5日 6:23:23 string.Format("{0:Y}",dt);//2005年11月 string.Format("{0}",dt);//2005-11-5 14:23:23 string.Format("{0:yyyyMMddHHmmssffff}",dt);
Calculate the number of days difference between two dates
DateTime dt1 = Convert.DateTime("2007-8-1"); DateTime dt2 = Convert.DateTime("2007-8-15"); TimeSpan span = dt2.Subtract(dt1); int dayDiff = span.Days + 1;
Calculate the number of days in a certain month of a certain year
int days = DateTime.DaysInMonth(2007, 8); days = 31;
give Increase the date by one day and decrease it by one day
DateTime dt =DateTime.Now; dt.AddDays(1); //增加一天 dt.AddDays(-1);//减少一天 其它年份方法类似... Oracle SQL里转换日期函数 to_date("2007-6-6",'YYYY-MM-DD"); to_date("2007/6/6",'yyyy/mm/dd");
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