FUNCTION::CTIME(3stap) Time utility functions FUNCTION::CTIME(3stap)
NAME function::ctime - Convert seconds since epoch into human readable date/time string
ARGUMENTS epochsecs Number of seconds since epoch (as returned by gettimeofday_s)
DESCRIPTION Takes an argument of seconds since the epoch as returned by gettimeofday_s. Returns a string of the form
Wed Jun 30 21:49:08 1993
The string will always be exactly 24 characters. If the time would be unreasonable far in the past (before what can be represented with a 32 bit offset in seconds from the epoch) the returned string will be a long, long time ago.... If the time would be unreasonable far in the future the returned string will be far far in the future... (both these strings are also 24 characters wide).
Note that the epoch (zero) corresponds to
Thu Jan 1 00:00:00 1970
The earliest full date given by ctime, corresponding to epochsecs -2147483648 is Fri Dec 13 20:45:52 1901. The latest full date given by ctime, corresponding to epochsecs 2147483647 is Tue Jan 19 03:14:07 2038.
The abbreviations for the days of the week are Sun, Mon, Tue, Wed, Thu, Fri, and Sat. The abbreviations for the months are Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, and Dec.
) Note that the real C library ctime function puts a newline (0 character at the end of the string that this function does not. Also note that since the kernel has no concept of timezones, the returned time is always in GMT.
SystemTap Tapset Reference October 2012 FUNCTION::CTIME(3stap)