Package COM.INFORMATIMAGO.COMMON-LISP.CESARUM.GREGORIAN-CALENDAR


Defines the Gregorian calendar.


See also: COM.INFORMATIMAGO.COMMON-LISP.CESARUM.DATE
          COM.INFORMATIMAGO.COMMON-LISP.CESARUM.DATE.UTILITY
          COM.INFORMATIMAGO.COMMON-LISP.CESARUM.JULIAN-CALENDAR

License:

    AGPL3

    Copyright Pascal J. Bourguignon 2007 - 2012

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with this program.
    If not, see <http://www.gnu.org/licenses/>

+april+

constant

The number of the April month in the Gregorial calendar.

Initial value: 4

+august+

constant

The number of the August month in the Gregorial calendar.

Initial value: 8

+december+

constant

The number of the December month in the Gregorial calendar.

Initial value: 12

+february+

constant

The number of the February month in the Gregorial calendar.

Initial value: 2

+january+

constant

The number of the January month in the Gregorial calendar.

Initial value: 1

+july+

constant

The number of the July month in the Gregorial calendar.

Initial value: 7

+june+

constant

The number of the June month in the Gregorial calendar.

Initial value: 6

+march+

constant

The number of the Marchmonth in the Gregorial calendar.

Initial value: 3

+may+

constant

The number of the May month in the Gregorial calendar.

Initial value: 5

+november+

constant

The number of the November month in the Gregorial calendar.

Initial value: 11

+october+

constant

The number of the October month in the Gregorial calendar.

Initial value: 10

+september+

constant

The number of the September month in the Gregorial calendar.

Initial value: 9

(as-julian-date date)

generic-function

RETURN: The date converted to the Julian calendar.

(as-list-of-numbers date)

generic-function

Return the values of the date from the most significant
number to the last. It can be a list of a single number.
This is meaningful only in the context of the given date class, and used
to compare two dates of the same class.

(as-universal-time date)

generic-function

RETURN: The date converted to universal-time.

(date-after date duration)

generic-function

RETURN: The date DURATION after DATE.

(date-before date duration)

generic-function

RETURN: The date DURATION before DATE.

(date-from-day-number day-number)

function

RETURN: the gregorian-date of the given DAY-NUMBER.

(date-to-day-number day month year)

function

RETURN: the day number of the gregorian-date given by DAY, MONTH and YEAR.

(day duration)

generic-function

RETURN: The day of the duration.
NOTE:   This is not the duration expressed in day, just the day
        component of the duration.

(decrement-day date &optional increment)

generic-function

DO: Changes the DATE to INCREMENT days before DATE.

(duration-between end start)

generic-function

Return the DURATION between END and START.
Both END and START dates must be of the same class.

(gregorian &key year month day hour minute seconde timezone universal-time)

function

RETURN:         A new Gregorian date.
YEAR:           The year (historically, should be greater or equal to 1582).
MONTH:          The month.
DAY:            The day.
HOUR:           The hour.
MINUTE:         The minute.
SECONDE:        The second.
TIMEZONE:       The timezone.
UNIVERSAL-TIME: The date expressed in universal-time.
NOTE:           UNIVERSAL-TIME when present gives a base date with
                default values for the other fields.

gregorian-calendar-date

class

A date in the Gregorian calendar.

Class precedence list: GREGORIAN-CALENDAR-DATE STANDARD-OBJECT T

Class init args: YEAR MONTH DAY HOUR MINUTE SECONDE TIMEZONE

(hour duration)

generic-function

RETURN: The hour of the duration.
NOTE:   This is not the duration expressed in hour, just the hour
        component of the duration.

(increment-day date &optional increment)

generic-function

DO: Changes the DATE to INCREMENT days after DATE.

(leap-year-p year)

function

RETURN: Whether YEAR is a gregorian leap year.

(minute duration)

generic-function

RETURN: The minute of the duration.
NOTE:   This is not the duration expressed in minute, just the minute
        component of the duration.

(month duration)

generic-function

RETURN: The month of the duration.
NOTE:   This is not the duration expressed in month, just the month
        component of the duration.

(next-day date &optional increment)

generic-function

RETURN: A new date that is INCREMENT days after DATE.

(previous-day date &optional increment)

generic-function

RETURN: A new date that is INCREMENT days before DATE.

(seconde duration)

generic-function

RETURN: The seconde of the duration.
NOTE:   This is not the duration expressed in seconde, just the seconde
        component of the duration.

(timezone date)

generic-function

RETURN: The timezone of a date
        = number of seconds from Greenwich; East positive.

(to-timezone date timezone)

generic-function

RETURN: A new date equal to the DATE, but in the given TIMEZONE.

(week duration)

generic-function

RETURN: The week of the duration.
NOTE:   This is not the duration expressed in week, just the week
        component of the duration.

(weekday date)

generic-function

RETURN: The weekday of a date.

(year duration)

generic-function

RETURN: The year of the duration.
NOTE:   This is not the duration expressed in year, just the year
        component of the duration.