формат даты и времени (format date and time)
Стандарты (Conforming to)
SVr4, C89, C99. There are strict inclusions between the set of
conversions given in ANSI C (unmarked), those given in the Single
UNIX Specification (marked SU), those given in Olson's timezone
package (marked TZ), and those given in glibc (marked GNU),
except that %+
is not supported in glibc2. On the other hand
glibc2 has several more extensions. POSIX.1 only refers to ANSI
C; POSIX.2 describes under date(1) several extensions that could
apply to strftime
() as well. The %F
conversion is in C99 and
POSIX.1-2001.
In SUSv2, the %S
specifier allowed a range of 00 to 61, to allow
for the theoretical possibility of a minute that included a
double leap second (there never has been such a minute).