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NetBSD 6.1.5 - man page for parsedate (netbsd section 3)

PARSEDATE(3)			   BSD Library Functions Manual 		     PARSEDATE(3)

NAME
     parsedate -- date parsing function

LIBRARY
     System Utilities Library (libutil, -lutil)

SYNOPSIS
     #include <util.h>

     time_t
     parsedate(const char *datestr, const time_t *time, const int *tzoff);

DESCRIPTION
     The parsedate() function parses a datetime from datestr described in english relative to an
     optional time point and an optional timezone offset in seconds specified in tzoff.  If
     either time or tzoff are NULL, then the current time and timezone offset are used.

     The datestr is a sequence of white-space separated items.	The white-space is optional the
     concatenated items are not ambiguous.  An empty datestr is equivalent to midnight today (the
     beginning of this day).

     The following words have the indicated numeric meanings: last = -1, this = 0, first, next,
     or one = 1, second is unused so that it is not confused with ``seconds'', two = 2, third or
     three = 3, fourth or four = 4, fifth or five = 5, sixth or six = 6, seventh or seven = 7,
     eighth or eight = 8, ninth or nine = 9, tenth or ten = 10, eleventh or eleven = 11, twelfth
     or twoelve = 12.

     The following words are recognized in English only: AM, PM, a.m., p.m.

     The months: january, february, march, april, may, june, july, august, september, sept,
     october, november, december,

     The days of the week: sunday, monday, tuesday, tues, wednesday, wednes, thursday, thur,
     thurs, friday, saturday.

     Time units: year, month, fortnight, week, day, hour, minute, min, second, sec, tomorrow,
     yesterday.

     Timezone names: gmt, ut, utc, wet, bst, wat, at, ast, adt, est, edt, cst, cdt, mst, mdt,
     pst, pdt, yst, ydt, hst, hdt, cat, ahst, nt, idlw, cet, met, mewt, mest, swt, sst, fwt, fst,
     eet, bt, zp4, zp5, zp6, wast, wadt, cct, jst, east, eadt, gst, nzt, nzst, nzdt, idle.

     A variety of unambiguous dates are recognized:
     69-09-10	  For years between 69-99 we assume 1900+ and for years between 0-68 we assume
		  2000+.
     2006-11-17   An ISO-8601 date.
     10/1/2000	  October 10, 2000; the common US format.
     20 Jun 1994
     23jun2001
     1-sep-06	  Other common abbreviations.
     1/11	  the year can be omitted

     As well as times:
     10:01
     10:12pm
     12:11:01.000012
     12:21-0500

     Relative items are also supported:
     -1 month
     last friday
     one week ago
     this thursday
     next sunday
     +2 years

     Seconds since epoch (also known as UNIX time) are also supported:
     @735275209  Tue Apr 20 03:06:49 UTC 1993

RETURN VALUES
     parsedate() returns the number of seconds passed since the Epoch, or -1 if the date could
     not be parsed properly.

SEE ALSO
     date(1), eeprom(8)

HISTORY
     The parser used in parsedate() was originally written by Steven M. Bellovin while at the
     University of North Carolina at Chapel Hill.  It was later tweaked by a couple of people on
     Usenet.  Completely overhauled by Rich $alz and Jim Berets in August, 1990.

     The parsedate() function first appeared in NetBSD 4.0.

BUGS
     1
       The parsedate() function is not re-entrant or thread-safe.
     2
       The parsedate() function cannot compute days before the unix epoch (19700101).
     3
       The parsedate() function assumes years less than 0 mean - year, years less than 70 mean
       2000 + year, years less than 100 mean 1900 + year.

BSD					December 20, 2010				      BSD


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