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diff --git a/reference/C/MAN/asctime.htm b/reference/C/MAN/asctime.htm new file mode 100644 index 0000000..d40f4cb --- /dev/null +++ b/reference/C/MAN/asctime.htm @@ -0,0 +1,233 @@ +<TITLE>asctime</TITLE> +<body bgcolor="#ffffcc"> +<hr> +<pre> + + + +<h3>CTIME(3) Linux Programmer's Manual CTIME(3) +</h3> + +<h3>NAME +</h3> asctime, ctime, gmtime, localtime, mktime - transform + binary date and time to ASCII + +<h3>SYNOPSIS +</h3> #include <time.h> + + char *asctime(const struct tm *timeptr); + + char *ctime(const time_t *timep); + + struct tm *gmtime(const time_t *timep); + + struct tm *localtime(const time_t *timep); + + time_t mktime(struct tm *timeptr); + + extern char *tzname[2]; + long int timezone; + extern int daylight; + +<h3>DESCRIPTION +</h3> The ctime(), gmtime() and localtime() functions all take + an argument of data type time_t which represents calendar + time. When interpreted as an absolute time value, it rep- + resents the number of seconds elapsed since 00:00:00 on + January 1, 1970, Coordinated Universal Time (UTC). + + The asctime() and mktime() functions both take an argument + representing broken-down time which is a binary represen- + tation separated into year, month, day, etc. Broken-down + time is stored in the structure tm which is defined in + <time.h> as follows: + + struct tm + { + int tm_sec; /* seconds */ + int tm_min; /* minutes */ + int tm_hour; /* hours */ + int tm_mday; /* day of the month */ + int tm_mon; /* month */ + int tm_year; /* year */ + int tm_wday; /* day of the week */ + int tm_yday; /* day in the year */ + int tm_isdst; /* daylight saving time */ + }; + + The members of the tm structure are: + + tm_sec The number of seconds after the minute, normally in + the range 0 to 59, but can be up to 61 to allow for + leap seconds. + + tm_min The number of minutes after the hour, in the range + + + +<h3>BSD June 30, 1993 1 +</h3> + + + + +<h3>CTIME(3) Linux Programmer's Manual CTIME(3) +</h3> + + 0 to 59. + + tm_hour + The number of hours past midnight, in the range 0 + to 23. + + tm_mday + The day of the month, in the range 1 to 31. + + tm_mon The number of months since January, in the range 0 + to 11. + + tm_year + The number of years since 1900. + + tm_wday + The number of days since Sunday, in the range 0 to + 6. + + tm_yday + The number of days since January 1, in the range 0 + to 365. + + tm_isdst + A flag that indicates whether daylight saving time + is in effect at the time described. The value is + positive if daylight saving time is in effect, zero + if it is not, and negative if the information is + not available. + + The ctime() function converts the calendar time timep into + a string of the form + + "Wed Jun 30 21:49:08 1993\n" + + The abbreviations for the days of the week are `Sun', + `Mon', `Tue', `Wed', `Thu', `Fri', and `Sat'. The abbre- + viations for the months are `Jan', `Feb', `Mar', `Apr', + `May', `Jun', `Jul', `Aug', `Sep', `Oct', `Nov', and + `Dec'. The return value points to a statically allocated + string which might be overwritten by subsequent calls to + any of the date and time functions. The function also + sets the external variable tzname with information about + the current time zone. + + The gmtime() function converts the calendar time timep to + broken-down time representation, expressed in Coordinated + Universal Time (UTC). + + The localtime() function converts the calendar time timep + to broken-time representation, expressed relative to the + user's specified time zone. The function sets the + external variables tzname with information about the cur- + rent time zone, timezone with the difference between + + + +<h3>BSD June 30, 1993 2 +</h3> + + + + +<h3>CTIME(3) Linux Programmer's Manual CTIME(3) +</h3> + + Coordinated Universal Time (UTC) and local standard time + in seconds, and daylight to a non-zero value if standard + US daylight savings time rules apply. + + The asctime() function converts the broken-down time value + timeptr into a string with the same format as ctime(). + The return value points to a statically allocated string + which might be overwritten by subsequent calls to any of + the date and time functions. + + The mktime() function converts a broken-down time struc- + ture to calendar time representation. The function + ignores the specified contents of the structure members + tm_wday and tm_yday and recomputes them from the other + information in the broken-down time structure. Calling + mktime() also sets the external variable tzname with + information about the current time zone. If the specified + broken-down time cannot be represented as calendar time, + mktime() returns a value of (time_t)(-1) and does not + alter the tm_wday and tm_yday members of the broken-down + time structure. + +<h3>CONFORMING TO +</h3> SVID 3, POSIX, BSD 4.3, ISO 9899 + +</pre> +<hr> +<h3>SEE ALSO +</h3><p> +<a href=date.htm>date</a>, +<a href=gettimeofday.htm>gettimeofday</a>, +<a href=time.htm>time</a>, +<a href=tzset.htm>tzset</a>, +<a href=difftime.htm>difftime</a>, +<a href=strftime.htm>strftime</a>, +<pre> + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +<h3>BSD June 30, 1993 3 +</h3> + +
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