date_time_value(?Field:atom, +Struct:datime, -Value) is nondet

Extract values from a date-time structure. Provided fields are

year	integer
month	1..12
day	1..31
hour	0..23
minute	0..59
second	0.0..60.0
utc_offset	integer	Offset to UTC in seconds (positive is west)
daylight_saving	bool	Name of timezone; fails if unknown
date	date(Y,M,D)
time	time(H,M,S)

 parse_time(+Text, -Stamp) is semidet

 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

Used for the HTTP protocol to represent time-stamps

iso_8601

Commonly used in XML documents.

 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)

 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)

Undocumented predicates

The following predicates are exported, but not or incorrectly documented.

 parse_time(Arg1, Arg2, Arg3)