| Specifier | Type | Example (Passed System.DateTime.Now) |
| d | Short date | 10/12/2002 |
| D | Long date | December 10, 2002 |
| t | Short time | 10:11 PM |
| T | Long time | 10:11:29 PM |
| f | Full date & | time |
| December 10, 2002 10:11 PM | F | Full date & |
| time (long) | December 10, 2002 10:11:29 PM | g |
| Default date & | time | 10/12/2002 10:11 PM |
| G | Default date & | time (long) |
| 10/12/2002 10:11:29 PM | M | Month day pattern |
| December 10 | r | RFC1123 date string |
| Tue, 10 Dec 2002 22:11:29 GMT | s | Sortable date string |
| 2002-12-10T22:11:29 | u | Universal sortable, local time |
| 2002-12-10 22:13:50Z | U | Universal sortable, GMT |
| December 11, 2002 3:13:50 AM | Y | Year month pattern |
| December, 2002 |
Custom date formatting:
| Specifier | Type | Example | Example Output |
| dd | Day | {0:dd} | 10 |
| ddd | Day name | {0:ddd} | Tue |
| dddd | Full day name | {0:dddd} | Tuesday |
| f, ff, … | Second fractions | {0:fff} | 932 |
| gg, … | Era | {0:gg} | A.D. |
| hh | 2 digit hour | {0:hh} | 10 |
| HH | 2 digit hour, 24hr format | {0:HH} | 22 |
| mm | Minute 00-59 | {0:mm} | 38 |
| MM | Month 01-12 | {0:MM} | 12 |
| MMM | Month abbreviation | {0:MMM} | Dec |
| MMMM | Full month name | {0:MMMM} | December |
| ss | Seconds 00-59 | {0:ss} | 46 |
| tt | AM or PM | {0:tt} | PM |
| yy | Year, 2 digits | {0:yy} | 02 |
| yyyy | Year | {0:yyyy} | 2002 |
| zz | Timezone offset, 2 digits | {0:zz} | -05 |
| zzz | Full timezone offset | {0:zzz} | -05:00 |
| : | Separator | {0:hh:mm:ss} | 10:43:20 |
| / | Separator | {0:dd/MM/yyyy} | 10/12/2002 |
Fonte: http://blog.stevex.net/index.php/string-formatting-in-csharp/