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.