ctime64(3C) ctime64(3C)
NAME
ctime64(), ctime64_r(), difftime64(), gmtime64(), gmtime64_r(), localtime64(), localtime64_r(), mktime64() - convert date and time to
string
SYNOPSIS
DESCRIPTION
Converts the calendar time pointed to by
timer, representing the time in seconds since the Epoch, and return a pointer to the local time in the form of a string.
Equivalent to:
Is identical to except that it places the result in the user supplied and returns a pointer to upon success. A buffer length of at least
26 is required.
Returns the difference in seconds between two calendar times:
time1 - time0.
Converts directly to Coordinated Universal Time (UTC),
the time standard used by the HP-UX operating system. returns a pointer to the structure.
Is identical to except that stores the result in the pointed to by and returns upon success.
Corrects for the time zone and any summer time zone adjustments
(such as Daylight Savings Time in the USA), according to the contents of the environment variable (see below). returns a
pointer to the structure.
Is identical to except that stores the result in the pointed to by and returns upon success.
Converts the broken-down time (expressed as local time)
in the structure pointed to by timeptr into a calendar time value with the same encoding as that of the values returned
by The original values of the and components of the structure are ignored, and the original values of the other compo-
nents are not restricted to the ranges indicated below.
A positive or zero value for causes to initially presume that Daylight Saving Time respectively is or is not in effect
for the specified time. A negative value for causes to attempt to determine whether Daylight Saving Time is in effect
for the specified time.
Upon successful completion, all the components are set to represent the specified calendar time, but with their values
forced to the ranges indicated below. The final value of is not set until and are determined. returns the specified
calendar time encoded as a value of type
The behavior of beyond the supported ranges is undefined.
The minimum and maximum dates supported by and are Friday December 13 20:45:52 UTC 1901 and Friday December 31 23:59:59 UTC 9999 respec-
tively.
and returns NULL and sets errno to if timer is less than the number of seconds that corresponds to the minimum date supported (in other
words, as defined in or exceeds the number of seconds that corresponds to the maximum date supported.
For more details on (see ctime(3C)).
EXTERNAL INFLUENCES
Locale
The category determines the interpretation of the bytes within format as single and/or multi-byte characters.
Environment Variables
The function uses the contents of to set the values of the external variables and also determines the time zone name substituted for the
and directives and the time zone adjustments performed by and Two methods for specifying a time zone within are described in environ(5).
International Code Set Support
Single and multibyte character code sets are supported.
RETURN VALUE
For if the buffer is of insufficient length, a NULL is returned and errno set to
and return a NULL and set errno to if NULL pointers are passed in as arguments.
A NULL is returned and errno is set to if the input to the following routines is not within the supported range: and
APPLICATION USAGE
The return values for and point to static data whose contents is overwritten by each call.
WARNINGS
The range of extends to 61 to allow for the occasional one or two leap seconds. However, the "seconds since the Epoch" value returned by
(see time(2)) and passed as the timer argument does not include accumulated leap seconds. The structure generated by and will never
reflect any leap seconds. Upon successful completion, forces the value of the component to the range [0,59].
AUTHOR
was developed by HP.
SEE ALSO
time(2), ctime(3C), setlocale(3C), tztab(4), environ(5), lang(5), langinfo(5), thread_safety(5).
ctime64(3C)