Converts the date and time information from a given calendar time time to a null-terminated wide character string str according to format string format. Up to count wide characters are written.
The format string consists of zero or more conversion specifiers and ordinary characters (except %
). All ordinary characters, including the terminating null character, are copied to the output string without modification. Each conversion specification begins with %
character, optionally followed by E
or O
modifier (ignored if unsupported by the locale), followed by the character that determines the behavior of the specifier. The following format specifiers are available:
%
writes literal %
. The full conversion specification must be %%
. n
t
Y
writes year as a decimal number, e.g. 2017 tm_year
EY
tm_year
y
writes last 2 digits of year as a decimal number (range [00,99]
) tm_year
Oy
tm_year
Ey
%EC
(locale-dependent) tm_year
C
[00,99]
) tm_year
EC
tm_year
G
In ISO 8601 weeks begin with Monday and the first week of the year must satisfy the following requirements:
tm_year
, tm_wday
, tm_yday
g
[00,99]
).
In ISO 8601 weeks begin with Monday and the first week of the year must satisfy the following requirements:
tm_year
, tm_wday
, tm_yday
Month b
writes abbreviated month name, e.g. Oct
(locale dependent) tm_mon
h
b
tm_mon
B
writes full month name, e.g. October
(locale dependent) tm_mon
m
writes month as a decimal number (range [01,12]
) tm_mon
Om
tm_mon
Week U
writes week of the year as a decimal number (Sunday is the first day of the week) (range [00,53]
) tm_year
, tm_wday
, tm_yday
OU
%U
, using the alternative numeric system, e.g. äºåäº instead of 52 in ja_JP locale tm_year
, tm_wday
, tm_yday
W
writes week of the year as a decimal number (Monday is the first day of the week) (range [00,53]
) tm_year
, tm_wday
, tm_yday
OW
%W
, using the alternative numeric system, e.g. äºåäº instead of 52 in ja_JP locale tm_year
, tm_wday
, tm_yday
V
[01,53]
).
In ISO 8601 weeks begin with Monday and the first week of the year must satisfy the following requirements:
tm_year
, tm_wday
, tm_yday
OV
%V
, using the alternative numeric system, e.g. äºåäº instead of 52 in ja_JP locale tm_year
, tm_wday
, tm_yday
Day of the year/month j
writes day of the year as a decimal number (range [001,366]
) tm_yday
d
writes day of the month as a decimal number (range [01,31]
) tm_mday
Od
Single character is preceded by a space.
tm_mday
e
[1,31]
).
Single digit is preceded by a space.
tm_mday
Oe
Single character is preceded by a space.
tm_mday
Day of the week a
writes abbreviated weekday name, e.g. Fri
(locale dependent) tm_wday
A
writes full weekday name, e.g. Friday
(locale dependent) tm_wday
w
writes weekday as a decimal number, where Sunday is 0
(range [0-6]
) tm_wday
Ow
0
, using the alternative numeric system, e.g. äº instead of 2 in ja_JP locale tm_wday
u
1
(ISO 8601 format) (range [1-7]
) tm_wday
Ou
1
, using the alternative numeric system, e.g. äº instead of 2 in ja_JP locale tm_wday
Hour, minute, second H
writes hour as a decimal number, 24 hour clock (range [00-23]
) tm_hour
OH
tm_hour
I
writes hour as a decimal number, 12 hour clock (range [01,12]
) tm_hour
OI
tm_hour
M
writes minute as a decimal number (range [00,59]
) tm_min
OM
tm_min
S
writes second as a decimal number (range [00,60]
) tm_sec
OS
tm_sec
Other c
writes standard date and time string, e.g. Sun Oct 17 04:41:13 2010
(locale dependent) all Ec
x
writes localized date representation (locale dependent) all Ex
X
writes localized time representation, e.g. 18:40:20 or 6:40:20 PM (locale dependent) all EX
D
tm_mon
, tm_mday
, tm_year
F
tm_mon
, tm_mday
, tm_year
r
tm_hour
, tm_min
, tm_sec
R
tm_hour
, tm_min
T
tm_hour
, tm_min
, tm_sec
p
writes localized a.m. or p.m. (locale dependent) tm_hour
z
-0430
), or no characters if the time zone information is not available tm_isdst
Z
writes locale-dependent time zone name or abbreviation, or no characters if the time zone information is not available tm_isdst
Number of wide characters written into the wide character array pointed to by str not including the terminating L'\0' on success. If count was reached before the entire string could be stored, â0â is returned and the contents are undefined.
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