parsedate(3)

NAME
parsedate - date parsing function

LIBRARY
libutil

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 or next 1, second is unused so that it is not confused with “seconds”, third = 3, fourth = 4, fifth = 5, sixth = 6, seventh = 7, eighth = 8, ninth = 9, tenth = 10, eleventh = 11, twelfth = 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

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. 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.