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DateTime and String

 

Convert String to DateTime

1. User CultureInfo class to parse the DateTime string

CultureInfo cultEnUs = new CultureInfo("en-US");
DateTime myDate = Convert.ToDateTime("03/22/2010", cultEnUs.DateTimeFormat);

2. User the DateTimeFormatInfo class to parse the DateTime string

string strDate = "21-07-2006";
DateTimeFormatInfo dtfi = new DateTimeFormatInfo();
dtfi.ShortDatePattern = "dd-MM-yyyy";
dtfi.DateSeparator = "-";
DateTime objDate = Convert.ToDateTime(strDate, dtfi);

 

Convert DateTime to String

1. Use the DateTime.ToString Method.
This is the easiest way to convert DateTime to a string.

Example:

DateTime.Now.ToString("yyyy-MM-dd");

2. User the String.Format Method.

There are following custom format specifies y (year), M (month), d (day), h (hour 12), H (hour 24), m (minute), s (second), f (second fraction), F (second fraction, trailing zeroes are trimmed), t (P.M or A.M) and z (time zone).

Following examples demonstrate how are the format specifies rewritten to the output.

// 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" sec.fraction 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

 

You can use also date separator / (slash) and time Separator : (colon). These characters will be rewritten to characters defined in the current DateTimeFormatInfo.DateSeparator and DateTimeFormatInfo.TimeSeparator.

// date separator in german culture is "." (so "/" changes to ".")

String.Format("{0:d/M/yyyy HH:mm:ss}", dt); // "9/3/2008 16:05:07" - English (en-US)
String.Format("{0:d/M/yyyy HH:mm:ss}", dt); // "9.3.2008 16:05:07" - German (de-DE)

Here are some examples of custom date and time formatting:

// 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"

Standard DateTime Formatting

In DateTimeFormatInfo there are defined standard patterns for the current culture. For example property ShortTimePattern is string that contains value h:mm tt for en-US culture and value HH:mm for de-DE culture.

Here are patterns defined in DateTimeFormatInfo and their values for en-US culture. First column contains format specifies for the String.Format method. (*) = culture independent

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 SortableDateTi mePattern yyyy'-'MM'-'dd'T'HH':'mm':'ss (*)
u UniversalSorta bleDateTimePat tern yyyy'-'MM'-'dd HH':'mm':'ss'Z' (*)

Following examples show usage of standard format specifiers in String.Format method and the resulting output.

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

 

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