PARSEDATE(3)						     Library Functions Manual						      PARSEDATE(3)

NAME

       parsedate - convert time and date string to number

SYNOPSIS

       #include <sys/types.h>

       typedef struct _TIMEINFO {
	   time_t	    time;
	   long 	    usec;
	   long 	    tzone;
       } TIMEINFO;

       time_t
       parsedate(text, now)
	   char 	    *text;
	   TIMEINFO	    *now;

DESCRIPTION

       Parsedate converts many common time specifications into the number of seconds since the epoch -- i.e., a time_t; see time(2).

       Parsedate  returns  the	time, or -1 on error.  Text is a character string containing the time and date.  Now is a pointer to the time that
       should be used for calculating relative dates.  If now is NULL, then GetTimeInfo in libinn(3) is used to obtain the current time and  time-
       zone.

       The character string consists of zero or more specifications of the following form:

       time   A  time  of  day, which is of the form hh[:mm[:ss]] [meridian] [zone] or hhmm [meridian] [zone].	If no meridian is specified, hh is
	      interpreted on a 24-hour clock.

       date   A specific month and day with optional year.  The acceptable formats are mm/dd[/yy], yyyy/mm/dd, monthname dd[,  yy],  dd  monthname
	      [yy],  and  day, dd monthname yy.  The default year is the current year.	If the year is less then 100, then 1900 is added to it; if
	      it is less then 21, then 2000 is added to it.

       relative time
	      A specification relative to the current time.  The format is number unit; acceptable units are year, month, week, day, hour,  minute
	      (or min), and second (or sec).  The unit can be specified as a singular or plural, as in 3 weeks.

       The  actual  date  is calculated according to the following steps.  First, any absolute date and/or time is processed and converted.  Using
       that time as the base, day-of-week specifications are added.  Next, relative specifications are used.  If a date or day is  specified,  and
       no  absolute or relative time is given, midnight is used.  Finally, a correction is applied so that the correct hour of the day is produced
       after allowing for daylight savings time differences.

       Parsedate ignores case when parsing all words; unknown words are taken to be unknown timezones, which are treated as GMT.  The names of the
       months  and  days  of  the week can be abbreviated to their first three letters, with optional trailing period.	Periods are ignored in any
       timezone or meridian values.

BUGS

       Parsedate does not accept all desirable and unambiguous constructions.  Semantically incorrect dates such as ``February 31'' are accepted.

       Daylight savings time is always taken as a one-hour change which is wrong for some places.  The daylight savings time  correction  can  get
       confused if parsing a time within an hour of when the reckoning changes, or if given a partial date.

HISTORY

       Originally  written  by	Steven M. Bellovin <smb@research.att.com> while at the University of North Carolina at Chapel Hill and distributed
       under the name getdate.

       A major overhaul was done by Rich $alz <rsalz@bbn.com> and Jim Berets <jberets@bbn.com> in August, 1990.

       It was further revised (primarily to remove obsolete constructs and timezone names) a year later by Rich (now <rsalz@osf.org>)  for  Inter-
       NetNews, and the name was changed.  This is revision 1.10, dated 1993/01/29.

SEE ALSO

       date(1), ctime(3), libinn(3), time(2).

																      PARSEDATE(3)