Method 1: Convert.ToDateTime(string)
string format has requirements, it must be yyyy-MM-dd hh:mm:ss
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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);
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Method 2: 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);
With reference information:
CultureInfo cultureInfo = CultureInfo.CreateSpecificCulture("en-US");
string format = "ddd MMM d HH:mm:ss zz00 yyyy";
string stringValue = DateTime.Now.ToString(format, cultureInfo); Get the date string
DateTime datetime = DateTime.ParseExact("Wed Aug 25 16:28:03 +0800 2010", format, cultureInfo); Convert strings to dates
other
Date format: yyyyMMdd HH:mm:ss (note that this string is very strictly case-based)
yyyy: represents the year
MM: Represents month
dd: stands for heaven
HH: Represents Hours (24-hour clock)
mm: stands for minutes
ss: stands for 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(); November 5, 2005
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(); The question mark is a time period
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(); November 2005
dt. GetDateTimeFormats('D')[0]. ToString(); November 5, 2005
dt. GetDateTimeFormats('D')[1]. ToString(); //2005 11 05
dt. GetDateTimeFormats('D')[2]. ToString(); Saturday 2005 11 05
dt. GetDateTimeFormats('D')[3]. ToString(); Saturday 5 November 2005
dt. GetDateTimeFormats('M')[0]. ToString(); November 5th
dt. GetDateTimeFormats('f')[0]. ToString(); November 05, 2005 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); November 5, 2005
string. Format("{0:f}",dt); November 05, 2005 2:23 PM
string. Format("{0:F}",dt); 14:23:23, 5 Nov 2005
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); November 5th
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); November 05, 2005 6:23:23 AM
string. Format("{0:Y}",dt); November 2005
string. Format("{0}",dt); //2005-11-5 14:23:23
string. Format("{0:yyyyMMddHHmmssffff}",dt);
Calculate the difference in days between 2 dates
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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 year and month
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int days = DateTime.DaysInMonth(2007, 8);
days = 31;
Add one day to the date and subtract one day
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DateTime dt =DateTime.Now;
dt. AddDays(1); Add one day
dt. AddDays(-1); One day less
Other years are similar...
Convert date functions in Oracle SQL
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to_date("2007-6-6",'YYYY-MM-DD");
to_date("2007/6/6",'yyyy/mm/dd"); |
Posted on 6/12/2015 10:26:17 AM
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