date-time

The class of a date-time object. date-time instances are created with the function date-time. The function merge-date-times also can create date-time objects. The values in the slots of a date-time object are immutable. The slot readers for the date-time class are:

• date-time-ymd-yd-before-year-0: a boolean, true if the Calendar date is before the year 0. (See also date-time-ywd-before-year-0. Note that these functions may return different values for some days around January 1, year 0.)
• date-time-ymd-yd-century
• date-time-ymd-yd-year-in-century
• date-time-ymd-month
• date-time-ymd-day
• date-time-yd-day
• date-time-ywd-before-year-0: a boolean, true if the Week date is before the year 0. (See also date-time-ymd-yd-before-year-0. Note that these functions may return different values for some days around January 1, year 0.)
• date-time-ywd-century: an integer specifying the Week date century.
• date-time-ywd-decade-in-century: an integer specifying the Week date decade in the century.
• date-time-ywd-year-in-decade: the Week date year in the decade.
• date-time-ywd-week: an integer between 1 and 53, inclusive.
• date-time-ywd-day: an integer from 1 (Monday) to 7 (Sunday).
• date-time-hour: an integer specifying the hour.
• date-time-hourf: a rational specfying the hour and fraction of an hour.
• date-time-minute: an integer specifying the minute.
• date-time-minutef: a rational specfying the minute and fraction of a minute.
• date-time-second: an integer specifying the second.
• date-time-secondf: a rational specfying the second and fraction of a second.
• date-time-zone-hour: an integer.
• date-time-zone-minute: an integer.

See also the functions decode-date-time, date-time-year, and date-time-zone and the classes duration and time-interval.

See date-time.htm for information on support in Allegro CL for parsing and generating time expressions using the ISO 8601 standard.

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This page was not revised from the 10.0 page.
Created 2019.8.20.