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date.pl -- Process dates and times
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Source date_time_value(?Field:atom, +Struct:datime, -Value) is nondet
Extract values from a date-time structure. Provided fields are
yearinteger
month1..12
day1..31
hour0..23
minute0..59
second0.0..60.0
utc_offsetintegerOffset to UTC in seconds (positive is west)
daylight_savingboolName of timezone; fails if unknown
datedate(Y,M,D)
timetime(H,M,S)
Source parse_time(+Text, -Stamp) is semidet
Source parse_time(+Text, ?Format, -Stamp) is semidet
Stamp is a timestamp created from parsing Text using the representation Format. Currently supported formats are:
rfc_1123
Preferred for the HTTP protocol to represent time-stamps, e.g.
Fri, 08 Dec 2006 15:29:44 GMT

All components except for the time zone are obligatory. If the time zone is omitted, the time is interpreted as local time.

rfc_1036
(Outdated) alternative for HTTP Protocol, e.g.
Sunday, 06-Nov-94 08:49:37 GMT
iso_8601
Commonly used in XML documents. Actually the XML RFC3339 is a profile of ISO8601. For example
2006-12-08T15:29:44Z

The ISO8601 format allows removing components from the right, returning the lowest time stamp in the specified internal. If a time is specified but no time zone, the time stamp is computed for the local time. If only the date components are specified, the stamp uses UTC. To compute the start of a day in local time, use e.g. 2006-12-08T00.

asctime
ANSI C's asctime() format, e.g.
Sun Nov  6 08:49:37 1994

This format has no time zone and is interpreted as local time.

Arguments:
Text- is an atom, string or list of character codes.
See also
- xsd_time_string/3 from library(sgml) implements RFC3339 strictly.
Source day_of_the_week(+Date, -DayOfTheWeek) is det
Computes the day of the week for a given date. Days of the week are numbered from one to seven: monday = 1, tuesday = 2, ..., sunday = 7.
Arguments:
Date- is a term of the form date(+Year, +Month, +Day)
Source day_of_the_year(+Date, -DayOfTheYear) is det
Computes the day of the year for a given date. Days of the year are numbered from 1 to 365 (366 for a leap year).
Arguments:
Date- is a term of the form date(+Year, +Month, +Day)