ref: d97eb114d5dd63f3f0d5b96d8f34a1613761793e
dir: /sys/man/2/ctime/
.TH CTIME 2 .SH NAME ctime, localtime, gmtime, asctime, tm2sec, timezone \- convert date and time .SH SYNOPSIS .B #include <u.h> .br .B #include <libc.h> .PP .ta \w'\fLchar* 'u .B char* ctime(long clock) .PP .B Tm* localtime(long clock) .PP .B Tm* gmtime(long clock) .PP .B char* asctime(Tm *tm) .PP .B long tm2sec(Tm *tm) .PP .B /env/timezone .SH DESCRIPTION .I Ctime converts a time .I clock such as returned by .IR time (2) into .SM ASCII (sic) and returns a pointer to a 30-byte string in the following form. All the fields have constant width. .PP .B Wed Aug 5 01:07:47 EST 1973\en\e0 .PP .I Localtime and .I gmtime return pointers to structures containing the broken-down time. .I Localtime corrects for the time zone and possible daylight savings time; .I gmtime converts directly to GMT. .I Asctime converts a broken-down time to .SM ASCII and returns a pointer to a 30-byte string. .IP .EX .ta 6n +\w'char 'u +\w'zone[4]; 'u typedef struct { int sec; /* seconds (range 0..59) */ int min; /* minutes (0..59) */ int hour; /* hours (0..23) */ int mday; /* day of the month (1..31) */ int mon; /* month of the year (0..11) */ int year; /* year A.D. \- 1900 */ int wday; /* day of week (0..6, Sunday = 0) */ int yday; /* day of year (0..365) */ char zone[4]; /* time zone name */ int tzoff; /* time zone delta from GMT */ } Tm; .EE .PP .I Tm2sec converts a broken-down time to seconds since the start of the epoch. It ignores .BR wday , and assumes the local time zone if .B zone is not .BR GMT . .PP When local time is first requested, the program consults the .B timezone environment variable to determine the time zone and converts accordingly. (This variable is set at system boot time by .IR init (8).) The .B timezone variable contains the normal time zone name and its difference from GMT in seconds followed by an alternate (daylight) time zone name and its difference followed by a newline. The remainder is a list of pairs of times (seconds past the start of 1970, in the first time zone) when the alternate time zone applies. For example: .IP .EX EST -18000 EDT -14400 9943200 25664400 41392800 57718800 ... .EE .PP Greenwich Mean Time is represented by .IP .EX GMT 0 .EE .SH SOURCE .B /sys/src/libc/9sys .SH "SEE ALSO" .IR date (1), .IR time (2), .IR init (8) .SH BUGS The return values point to static data whose content is overwritten by each call. .br Daylight Savings Time is ``normal'' in the Southern hemisphere. .br These routines are not equipped to handle non-\c .SM ASCII text, and are provincial anyway.