我想转换一个c#日期时间到“YYYYMMDDHHMMSS”格式。但我没有找到一个内置的方法来获得这种格式?任何评论?
当前回答
在.Net Standard 2中，你可以像下面这样格式化DateTime:
DateTime dt = DateTime.Now;
CultureInfo iv = CultureInfo.InvariantCulture;
// Default formats
// D - long date Tuesday, 24 April 2018
// d - short date 04/24/2018
// F - full date long Tuesday, 24 April 2018 06:30:00
// f - full date short Tuesday, 24 April 2018 06:30
// G - general long 04/24/2018 06:30:00
// g - general short 04/24/2018 06:30
// U - universal full Tuesday, 24 April 2018 06:30:00
// u - universal sortable 2018-04-24 06:30:00
// s - sortable 2018-04-24T06:30:00
// T - long time 06:30:00
// t - short time 06:30
// O - ISO 8601 2018-04-24T06:30:00.0000000
// R - RFC 1123 Tue, 24 Apr 2018 06:30:00 GMT
// M - month April 24
// Y - year month 2018 April
Console.WriteLine(dt.ToString("D", iv));
// Custom formats
// M/d/yy 4/8/18
// MM/dd/yyyy 04/08/2018
// yy-MM-dd 08-04-18
// yy-MMM-dd ddd 08-Apr-18 Sun
// yyyy-M-d dddd 2018-4-8 Sunday
// yyyy MMMM dd 2018 April 08
// h:mm:ss tt zzz 4:03:05 PM -03
// HH:m:s tt zzz 16:03:05 -03:00
// hh:mm:ss t z 04:03:05 P -03
// HH:mm:ss tt zz 16:03:05 PM -03
Console.WriteLine(dt.ToString("M/d/yy", iv));
其他回答
以上任何一个答案都不能解决你的问题的可能性很小。尽管如此，我还是分享了我的方法，它总是适用于不同格式的约会时间。
//Definition
public static DateTime ConvertPlainStringToDatetime(string Date, string inputFormat, string outputFormat)
{
DateTime date;
CultureInfo enUS = new CultureInfo("en-US");
DateTime.TryParseExact(Date, inputFormat, enUS,
DateTimeStyles.AdjustToUniversal, out date);
string formatedDateTime = date.ToString(outputFormat);
return Convert.ToDateTime(formatedDateTime);
}
//Calling
string oFormat = "yyyy-MM-dd HH:mm:ss";
DateTime requiredDT = ConvertPlainStringToDatetime("20190205","yyyyMMddHHmmss", oFormat );
DateTime requiredDT = ConvertPlainStringToDatetime("20190508-12:46:42","yyyyMMdd-HH:mm:ss", oFormat);
DateTime.Now.ToString("yyyyMMddHHmmss");
如果你只是想把它显示为字符串
DateTime.Now.ToString("MM/dd/yyyy") 05/29/2015
DateTime.Now.ToString("dddd, dd MMMM yyyy") Friday, 29 May 2015
DateTime.Now.ToString("dddd, dd MMMM yyyy") Friday, 29 May 2015 05:50
DateTime.Now.ToString("dddd, dd MMMM yyyy") Friday, 29 May 2015 05:50 AM
DateTime.Now.ToString("dddd, dd MMMM yyyy") Friday, 29 May 2015 5:50
DateTime.Now.ToString("dddd, dd MMMM yyyy") Friday, 29 May 2015 5:50 AM
DateTime.Now.ToString("dddd, dd MMMM yyyy HH:mm:ss") Friday, 29 May 2015 05:50:06
DateTime.Now.ToString("MM/dd/yyyy HH:mm") 05/29/2015 05:50
DateTime.Now.ToString("MM/dd/yyyy hh:mm tt") 05/29/2015 05:50 AM
DateTime.Now.ToString("MM/dd/yyyy H:mm") 05/29/2015 5:50
DateTime.Now.ToString("MM/dd/yyyy h:mm tt") 05/29/2015 5:50 AM
DateTime.Now.ToString("MM/dd/yyyy HH:mm:ss") 05/29/2015 05:50:06
DateTime.Now.ToString("MMMM dd") May 29
DateTime.Now.ToString("yyyy’-‘MM’-‘dd’T’HH’:’mm’:’ss.fffffffK") 2015-05-16T05:50:06.7199222-04:00
DateTime.Now.ToString("ddd, dd MMM yyy HH’:’mm’:’ss ‘GMT’") Fri, 16 May 2015 05:50:06 GMT
DateTime.Now.ToString("yyyy’-‘MM’-‘dd’T’HH’:’mm’:’ss") 2015-05-16T05:50:06
DateTime.Now.ToString("HH:mm") 05:50
DateTime.Now.ToString("hh:mm tt") 05:50 AM
DateTime.Now.ToString("H:mm") 5:50
DateTime.Now.ToString("h:mm tt") 5:50 AM
DateTime.Now.ToString("HH:mm:ss") 05:50:06
DateTime.Now.ToString("yyyy MMMM") 2015 May
一个简单的方法，完全控制'从类型'和'到类型'，只需要记住这个代码为未来的类型转换
DateTime.ParseExact(InputDate, "dd/MM/yyyy", CultureInfo.InvariantCulture).ToString("yyyy/MM/dd"));
这个网站有很好的例子
// create date time 2008-03-09 16:05:07.123
DateTime dt = new DateTime(2008, 3, 9, 16, 5, 7, 123);
String.Format("{0:y yy yyy yyyy}", dt); // "8 08 008 2008" year
String.Format("{0:M MM MMM MMMM}", dt); // "3 03 Mar March" month
String.Format("{0:d dd ddd dddd}", dt); // "9 09 Sun Sunday" day
String.Format("{0:h hh H HH}", dt); // "4 04 16 16" hour 12/24
String.Format("{0:m mm}", dt); // "5 05" minute
String.Format("{0:s ss}", dt); // "7 07" second
String.Format("{0:f ff fff ffff}", dt); // "1 12 123 1230" sec.fraction
String.Format("{0:F FF FFF FFFF}", dt); // "1 12 123 123" without zeroes
String.Format("{0:t tt}", dt); // "P PM" A.M. or P.M.
String.Format("{0:z zz zzz}", dt); // "-6 -06 -06:00" time zone
// month/day numbers without/with leading zeroes
String.Format("{0:M/d/yyyy}", dt); // "3/9/2008"
String.Format("{0:MM/dd/yyyy}", dt); // "03/09/2008"
// day/month names
String.Format("{0:ddd, MMM d, yyyy}", dt); // "Sun, Mar 9, 2008"
String.Format("{0:dddd, MMMM d, yyyy}", dt); // "Sunday, March 9, 2008"
// two/four digit year
String.Format("{0:MM/dd/yy}", dt); // "03/09/08"
String.Format("{0:MM/dd/yyyy}", dt); // "03/09/2008"
标准日期时间格式
String.Format("{0:t}", dt); // "4:05 PM" ShortTime
String.Format("{0:d}", dt); // "3/9/2008" ShortDate
String.Format("{0:T}", dt); // "4:05:07 PM" LongTime
String.Format("{0:D}", dt); // "Sunday, March 09, 2008" LongDate
String.Format("{0:f}", dt); // "Sunday, March 09, 2008 4:05 PM" LongDate+ShortTime
String.Format("{0:F}", dt); // "Sunday, March 09, 2008 4:05:07 PM" FullDateTime
String.Format("{0:g}", dt); // "3/9/2008 4:05 PM" ShortDate+ShortTime
String.Format("{0:G}", dt); // "3/9/2008 4:05:07 PM" ShortDate+LongTime
String.Format("{0:m}", dt); // "March 09" MonthDay
String.Format("{0:y}", dt); // "March, 2008" YearMonth
String.Format("{0:r}", dt); // "Sun, 09 Mar 2008 16:05:07 GMT" RFC1123
String.Format("{0:s}", dt); // "2008-03-09T16:05:07" SortableDateTime
String.Format("{0:u}", dt); // "2008-03-09 16:05:07Z" UniversalSortableDateTime
/*
Specifier DateTimeFormatInfo property Pattern value (for en-US culture)
t ShortTimePattern h:mm tt
d ShortDatePattern M/d/yyyy
T LongTimePattern h:mm:ss tt
D LongDatePattern dddd, MMMM dd, yyyy
f (combination of D and t) dddd, MMMM dd, yyyy h:mm tt
F FullDateTimePattern dddd, MMMM dd, yyyy h:mm:ss tt
g (combination of d and t) M/d/yyyy h:mm tt
G (combination of d and T) M/d/yyyy h:mm:ss tt
m, M MonthDayPattern MMMM dd
y, Y YearMonthPattern MMMM, yyyy
r, R RFC1123Pattern ddd, dd MMM yyyy HH':'mm':'ss 'GMT' (*)
s SortableDateTimePattern yyyy'-'MM'-'dd'T'HH':'mm':'ss (*)
u UniversalSortableDateTimePattern yyyy'-'MM'-'dd HH':'mm':'ss'Z' (*)
(*) = culture independent
*/
更新 使用c# 6字符串插值格式
// create date time 2008-03-09 16:05:07.123
DateTime dt = new DateTime(2008, 3, 9, 16, 5, 7, 123);
$"{dt:y yy yyy yyyy}"; // "8 08 008 2008" year
$"{dt:M MM MMM MMMM}"; // "3 03 Mar March" month
$"{dt:d dd ddd dddd}"; // "9 09 Sun Sunday" day
$"{dt:h hh H HH}"; // "4 04 16 16" hour 12/24
$"{dt:m mm}"; // "5 05" minute
$"{dt:s ss}"; // "7 07" second
$"{dt:f ff fff ffff}"; // "1 12 123 1230" sec.fraction
$"{dt:F FF FFF FFFF}"; // "1 12 123 123" without zeroes
$"{dt:t tt}"; // "P PM" A.M. or P.M.
$"{dt:z zz zzz}"; // "-6 -06 -06:00" time zone
// month/day numbers without/with leading zeroes
$"{dt:M/d/yyyy}"; // "3/9/2008"
$"{dt:MM/dd/yyyy}"; // "03/09/2008"
// day/month names
$"{dt:ddd, MMM d, yyyy}"; // "Sun, Mar 9, 2008"
$"{dt:dddd, MMMM d, yyyy}"; // "Sunday, March 9, 2008"
// two/four digit year
$"{dt:MM/dd/yy}"; // "03/09/08"
$"{dt:MM/dd/yyyy}"; // "03/09/2008"
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