例如：QDateTime::currentDateTime().toString("yyyy年MM月dd日 hh:mm:ss"); //輸出爲“2011年10月15日 18:22:13”
具體的格式設置Qt的文檔中寫得比較全：
These expressions may be used for the date:
| Expression | Output |
|---|---|
|
d |
the day as number without a leading zero (1 to 31) |
|
dd |
the day as number with a leading zero (01 to 31) |
|
ddd |
the abbreviated localized day name (e.g. 'Mon' to 'Sun'). Uses QDate::shortDayName(). |
|
dddd |
the long localized day name (e.g. 'Monday' to 'Qt::Sunday'). Uses QDate::longDayName(). |
|
M |
the month as number without a leading zero (1-12) |
|
MM |
the month as number with a leading zero (01-12) |
|
MMM |
the abbreviated localized month name (e.g. 'Jan' to 'Dec'). Uses QDate::shortMonthName(). |
|
MMMM |
the long localized month name (e.g. 'January' to 'December'). Uses QDate::longMonthName(). |
|
yy |
the year as two digit number (00-99) |
|
yyyy |
the year as four digit number |
These expressions may be used for the time:
| Expression | Output |
|---|---|
|
h |
the hour without a leading zero (0 to 23 or 1 to 12 if AM/PM display) |
|
hh |
the hour with a leading zero (00 to 23 or 01 to 12 if AM/PM display) |
|
m |
the minute without a leading zero (0 to 59) |
|
mm |
the minute with a leading zero (00 to 59) |
|
s |
the second without a leading zero (0 to 59) |
|
ss |
the second with a leading zero (00 to 59) |
|
z |
the milliseconds without leading zeroes (0 to 999) |
|
zzz |
the milliseconds with leading zeroes (000 to 999) |
|
AP |
use AM/PM display. AP will be replaced by either "AM" or "PM". |
|
ap |
use am/pm display. ap will be replaced by either "am" or "pm". |
All other input characters will be ignored. Any sequence of characters that are enclosed in singlequotes will be treated as text and not be used as an expression. Two consecutive singlequotes ("''") are replaced by a singlequote in the output.
Example format strings (assumed that the QDateTime is 21 May 2001 14:13:09):
| Format | Result |
|---|---|
|
dd.MM.yyyy |
21.05.2001 |
|
ddd MMMM d yy |
Tue May 21 01 |
|
hh:mm:ss.zzz |
14:13:09.042 |
|
h:m:s ap |
2:13:9 pm |
If the datetime is invalid, an empty string will be returned.