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<big><big>Try not to get into this state---><big><big>
[[Image:Almanac1871.jpg|right|250px|thumb|A page from the [[Hindu calendar]] 1871-72.]]
[[Image:MikeTheHeadlessChicken.jpg|thumb|[[Mike the Headless Chicken]] struts.]]
A '''calendar''' is a system for naming periods of time, typically [[day]]s. These names are known as [[calendar date]]s. Cycles in a calendar are often synchronised with the perceived motion of [[astronomical]] objects.
==Notes==
If you want to see something pretty funny check out the talk pages of [http://en.wikipedia.org/wiki/User_talk:Killertunes this dude] and [http://en.wikipedia.org/wiki/User_talk:Jyaus this dude] and the controversy surrounding the page for the band known as [[Platypus Rex]] (the latter dude is even a member).
==About Me==
A calendar is also a physical device (often paper). This is the most common usage of the word. other similar types of calendars can include computerised systems, which can be set to remind the user of upcoming events and appointments.
Hey all. I don't know why anyone would be interested in reading this, but I thought I might as well write something, instead of just adding a bunch of userboxes (which is ''much'' more fun IMO). I'm from the town of [[Moscow, Idaho|Moscow]] in the absolutely rockin' state of [[Idaho]] (and no, where I live does not look like ''[[Napoleon Dynamite]]''; we don't live in the [[1980s|eighties]] up here - that's just in [[Mormon]] country down south). Moscow is also the home of the [[University of Idaho]] which I currently attend.
As a subset, 'calendar' is also used to denote a list of particular set of planned events (for example, ''court calendar'').
Oh, yeah. First off: the name. No, there is no inside story behind it, and yeah, I know it's stupid, but what do you expect from one of those dumb random name generators you find on the internet anyway? Started editing Wikipedia sometime in mid-2005. Will perhaps add more later (but my middle name is [[Procrastination]], so I can't promise anything).
==Calendar systems==
==Pages I have started==
A full calendar system has a different [[calendar date]] for every day. Thus the [[week]] cycle is by itself not a full calendar system; neither is a system to name the days within a year without a system for identifying the years.
[[Image:North movie.jpg|thumb|200px|Here's something you don't see every day...]]
*[[TriOptimum Corporation]] - the first page I started after joining Wikipedia (you can probably tell ;). It still needs major work (it is currently tagged), which I haven't gotten around to doing yet - come on people! Help out!
*[[Citadel Station (System Shock)]] - A stub I began that has been substantially rewritten since.
The simplest calendar system just counts days from a reference day. This applies for the [[Julian day]]. Virtually the only possible variation is using a different reference day, in particular one less distant in the past to make the numbers smaller. Computations in these systems are just a matter of addition and subtraction.
*''[[Warcraft II: Beyond the Dark Portal]]'' - Have begun a stub on this expansion to Warcraft II, will add more.
Other calendars have one, or, more commonly, multiple larger units of time.
*''[[War Wind II: Human Onslaught]]'' - Another stub
Calendars that contain one level of cycles:
*week and weekday - this system (without year, the week number keeps on increasing) is not very common
*year and ordinal date within the year, e.g. the [[ISO 8601#Ordinal dates|ISO 8601 ordinal date system]]
*''[[Captain Quazar]]''
Calendars with two levels of cycles:
*year, month, and day - most systems, including the [[Gregorian calendar]] (and its very similar predecessor, the [[Julian calendar]]), the [[Islamic calendar]], and the [[Hebrew calendar]]
*year, week, and weekday - e.g. the [[ISO week date]]
*''[[Killing Time (video game)]]''
Cycles can be synchronised with periodic phenomena:
*''[[The Fighting Prince of Donegal]]'' - Movie stub page I started and need to add more to.
*A ''lunar calendar'' is synchronized to the motion of the [[Moon]] ([[lunar phase]]s); an example is the [[Islamic calendar]].
*A ''solar calendar'' is based on perceived [[seasonal year|seasonal]] changes synchronized to the apparent motion of the Sun; an example is the [[Persian calendar]].
*There are some calendars that appear to be synchronized to the motion of [[Venus]], such as some of the [[ancient Egypt]]ian calendars; synchronization to Venus appears to occur primarily in civilizations near the [[Equator]].
*The [[week]] cycle is an example of one that is not synchronized to any external phenomenon (although it may have been derived from lunar phases, beginning anew every month).
*[[The Mauretania Import Export Company]]
Very commonly a calendar includes more than one type of cycle, or has both cyclic and acyclic elements. A ''lunisolar calendar'' is synchronized both to the motion of the Moon and to the apparent motion of the Sun; an example is the [[Hebrew calendar|Jewish calendar]].
*''[[Super Puzzle Bobble]]''
Many calendars incorporate simpler calendars as elements. For example, the rules of the Jewish calendar depend on the seven-day week cycle (a very simple calendar), so the week is one of the cycles of the Jewish calendar. It is also common to operate two calendars simultaneously, usually providing unrelated cycles, and the result may also be considered a more complex calendar. For example, the [[Gregorian calendar]] has no inherent dependence on the seven-day week, but in [[Western society]] the two are used together, and calendar tools indicate both the Gregorian date and the day of week.
*''[[Maximum Force]]''
The week cycle is shared by various calendar systems (although the significance of special days such as Friday, Saturday, and Sunday varies). Systems of leap days usually do not affect the week cycle. The week cycle was not even interrupted when 10, 11, 12, or 13 dates were skipped when the Julian calendar was replaced by the Gregorian calendar by various countries.
More to come
===Solar calendars===
==Summary==
{{Main|Solar calendar}}
{{Information|
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|Permission =
I ([[User:Grandpafootsoldier|Grandpafootsoldier]]) have uploaded this image, , here. Though the picture is subject to copyright, I feel it is covered by the U.S. fair use laws for this page alone because:
# it is a low resolution copy of a ;
# it contributes to the article significantly;
# it does not limit the copyright owner's ability to sell copies of the in any way;
# no free equivalent is available at this time
}}
{{Template talk:Infobox Film/Syntax}}
{{Boxboxtop|Grandpafootsoldier|Left}}
==[[Wikipedia]]==
====Days used by solar calendars ====
{{user en}}
Solar calendars assign a ''date'' to each [[solar time|solar day]]. A day may consist of the period between [[sunrise]] and [[sunset]], with a following period of [[night]], or it may be a period between successive events such as two sunsets. The length of the interval between two such successive events may be allowed to vary slightly during the year, or it may be averaged into a [[solar time|mean solar day]]. Other types of calendar may also use a solar day.
{{user la-1}}
{{user grc-1}}
{{User WPCVG}}
==Politics==
<div style="float: left; border: solid white 1px; margin: 1px;">
{| cellspacing="0" style="width: 238px; background: white;"
| style="width: 45px; height: 45px; background: #4169e1; text-align: center; font-size: 14pt; color: black;" | '''[[:Category:Conservative Wikipedians|con]]'''
| style="font-size: 8pt; padding: 4pt; line-height: 1.25em; color: black;" | This user is interested in '''[[Conservatism|conservative]] issues'''.
|}</div>
{{User:1ne/Userboxes/User independent}}
</div>
<div style="float: left; border: solid #EEC900 2px; margin: 1px;">
{| cellspacing="0" style="width: 236px; color: #000000; background: #4169E1;"
| style="width: 45px; height: 45px; background: white; text-align: center; font-size: 14pt;" |[[Image:Capitalismlogo.JPG|42px]]
| style="font-size: 8pt; padding: 4pt; color: white; line-height: 1.25em;" | '''This user is in most respects a [[Capitalism|<span style="color:#EEC900">Capitalist</span>]] but is opposed to [[globalization]]'''. [[Category:Capitalist Wikipedians|{{PAGENAME}}]]
|}
</div>
{{userbox|white|red|[[Image:No Karl Marx.JPG|44px]]|This user thinks that both [[Karl Marx]], and [[Marxism]] in general, just plain suck.}}
{{userbox|black|yellow|[[image:George-W-Bush.jpeg|44px|George W. Bush]]|This user dislikes '''[[Bush]]''', but, paradoxically, is also tired of liberals complaining about him.}}
{{userbox|black|white|[[image:Bill Clinton.jpg|44px|Bill Clinton]]|This user thinks that [[Bill Clinton]] sucks donkey balls - literally as well as figuratively.}}
{{userbox|black|gold|[[Image:Flag of the Basque Country.svg|40px]]|This user supports the independence of the '''[[Basque Country]]'''.}}
<div style="float: left; border:solid red 1px; margin: 1px;">
{| cellspacing="0" style="width: 238px; background: limegreen;"
| style="width: 45px; height: 45px; background: red; text-align: center; font-size: {{{5|{{{id-s|14}}}}}}pt; color: {{{id-fc|black}}};" | '''[[Image:Flag of Taiwan proposed 1996.svg|40px]]'''
| style="font-size: {{{info-s|8}}}pt; padding: 4pt; line-height: 1.25em; color: {{{info-fc|black}}};" | This user supports the '''[[Taiwan independence|independence]] of [[Taiwan]]''' and a '''[[Republic of Taiwan]]'''.
|}</div>
{{userbox|green|light-blue|[[Image:Flag of Turkey.svg|40px]]|This user is opposed to the '''[[Enlargement of the European Union]].}}
{{userbox|blue|white|[[Image:No-EU.png|40px]]|This user does not like the [[European Union|EU]] very much at all, to tell you the truth.}}
<div style="float: left; border:solid #0066FF 1px; margin: 1px;">
{| cellspacing="0" style="width: 238px; background: lightblue;"
| style="width: 45px; height: 45px; background: #0066FF; text-align: center; font-size: {{{5|{{{id-s|14}}}}}}pt; color: {{{id-fc|black}}};" | '''PL'''
| style="font-size: {{{info-s|8}}}pt; padding: 4pt; line-height: 1.25em; color: {{{info-fc|black}}};" | This user is '''[[pro-life]]'''.
|}</div>
<div style="float: left; border:solid {{{1|black}}} 1px; margin: 1px;">
{| cellspacing="0" style="width: 238px; background: {{{2|lightred}}};"
| style="width: 45px; height: 45px; background: {{{1|white}}}; text-align: center; font-size: {{{5|8}}}pt; color: black;" | '''{{{3|[[Image:Pistol Browning SFS.jpg|50px]]}}}'''
| style="font-size: 8pt; padding: 4pt; line-height: 1.25em; color: black;" | {{{4|This user '''opposes [[gun control]]'''.}}}
|}</div>
{{User:Disavian/Userboxes/Nuclear Energy}}
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{{Boxboxtop}}
====Calendar reform====
{{Main|Calendar reform}}
==Background==
There have been a number of proposals for reform of the calendar, such as the [[World calendar]], [[International Fixed Calendar]], [[Holocene calendar]], and [[Sol Calendar]]. The [[United Nations]] considered adopting such a reformed calendar for a while in the 1950s, but these proposals have lost most of their popularity.
{{User:Feureau/UserBox/AmericanEnglish}}
{{User US}}
{{User:Feureau/UserBox/Proud Americans}}
{{User Idaho}}
{{userbox|yellow|white|[[Image:Flag of Idaho.svg|36px]]|This user thinks it is disgraceful that wikipedians from the [[Idaho|Great State of Idaho]] are stuck with the craptastic userbox above.}}
{{User Irish}}
{{User German}}
{{User Welsh}}
{{User English Ancestry}}
{{user Alsatian}}
{{User Scottish}}
{{userbox|black|white|[[Image:Tridentine_mass.jpg|36px]]|This user is a '''[[Traditionalist Catholic]]}}
{{User:Ginkgo100/Userboxes/User right-handed}}
{{User:Aeon1006/Userboxes/User Geek}}
{{User:MiraLuka/Userboxes/User male}}
{{User:MiraLuka/Userboxes/User straight}}
{{User:Scepia/teen}}
{{User dst 3}}
{{User:Springeragh/Templates/Userboxes/BigBro}}
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{{Boxboxtop|Grandpafootsoldier}}
===Lunar calendars===
{{Main|Lunar calendar}}
==Computer==
Not all calendars use the solar year as a unit. A [[lunar calendar]] is one in which days are numbered within each [[lunar phase]] cycle. Because the length of the lunar month is not an even fraction of the length of the tropical year, a purely lunar calendar quickly drifts against the seasons. It does, however, stay constant with respect to other phenomena, notably [[tide]]s. A '''[[lunisolar calendar]]''' is a lunar calendar that compensates by adding an extra month as needed to realign the months with the seasons. An example is the [[Hebrew calendar|Jewish calendar]] which uses a 19 year cycle..
{{User:The Raven's Apprentice/Userboxes/User PC}}
{{User:The Raven's Apprentice/Userboxes/User Laptop}}
{{User:The Raven's Apprentice/Userboxes/User Firefox}}
{{userbox|red|white|IE|This user dislikes [[Internet explorer]]}}
{{User:Menasim/Userboxes/User Google}}
{{User:The Raven's Apprentice/Userboxes/User MS Windows|XP}}
{{user ebay|digory87}}
==Games==
{{User:Scepia/cvg}}
{{User:The Raven's Apprentice/Userboxes/User PC}}
{{User:Scepia/SHODAN}}
{{User:Scepia/Deus Ex}}
{{User:Scepia/game| APBR| Deus Ex| color=green| fav=yes}}
{{User:Scepia/game character-3|JC Denton}}
{{User:Scepia/Half-Life 2}}
{{User:Scepia/Grand Theft Auto}}
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{{Boxboxtop|Grandpafootsoldier}}
==Interests==
Lunar calendars are believed to be the oldest calendars invented by mankind. [[Cro-Magnon man|Cro-Magnon]] people are claimed to have invented one around 32,000 BC.
{{user Classical}}
{{User celtic music}}
===Fiscal calendars===
{{User folk music}}
{{Main|Fiscal calendar}}
{{User:Holek/Userboxes/Anti HipHop}}
{{user viola}}
A fiscal calendar (such as a 5/4/4 calendar) fixes each month at a specific number of weeks to facilitate comparisons from month to month and year to year. January always has exactly 5 weeks (Sunday through Saturday), February has 4 weeks, March has 4 weeks, etc. Note that this calendar will normally need to add a 53rd week to every 5th or 6th year, which might be added to December or might not be, depending on how the organization uses those dates. There exists an international standard way to do this (the [[ISO 8601|ISO week]]). The ISO week runs Monday through Sunday and Week 1 is always the week that contains [[4 January]] Gregorian.
{{user violin}}
{{User History Subject}}
==Calendar subdivisions==
{{User:Royalguard11/userboxes/Tolkien}}
Nearly all calendar systems group consecutive days into "[[month]]s" and also into "[[year]]s". In a ''[[solar calendar]]'' a ''year'' approximates Earth's [[tropical year]] (that is, the time it takes for a complete cycle of [[season]]s), traditionally used to facilitate the planning of [[agriculture|agricultural]] activities. In a ''lunar calendar'', the ''month'' approximates the cycle of the moon phase. Consecutive days may be grouped into other periods such as the [[week]].
{{User:Royalguard11/userboxes/LOTR2}}
{{User:Royalguard11/userboxes/Ravenclaw}}
Because the number of days in the ''tropical year'' is not a whole number, a solar calendar must have a different number of days in different years. This may be handled, for example, by adding an extra day ([[29 February]]) in [[leap year]]s. The same applies to months in a lunar calendar and also the number of months in a year in a lunisolar calendar. This is generally known as [[intercalation]]. Even if a calendar is solar, but not lunar, the year cannot be divided entirely into months that never vary in length.
{{User:Scepia/sci-fi2}}
{{User:Scepia/Tintin}}
Cultures may define other units of time, such as the [[week]], for the purpose of scheduling regular activities that do not easily coincide with months or years. Many cultures use different baselines for their calendars' starting years. For example, the year in Japan is based on the reign of the current emperor--2006 would be Year 18 of the Emperor Akihito.
{{User anime}}
{{User Ghostintheshell2}}
==Other calendar types==
{{User Cowboy Bebop}}
===Complete and incomplete calendars===
{{User Samurai Champloo}}
Calendars may be either complete or incomplete. Complete calendars provide a way of naming each consecutive day, while incomplete calendars do not. The early Roman calendar, which had no way of designating the days of the winter months other than to lump them together as "winter", is an example of an incomplete calendar, while the Gregorian calendar is an example of a complete calendar.
{{User:Scepia/Calvin and Hobbes}}
{{Wikipedia:WikiProject Scouting/Userboxes/Eagle Scout}}
===Pragmatic, theoretical and mixed calendars===
{{Wikipedia:WikiProject Scouting/Userboxes/Arrowman}}
Calendars may be pragmatic, theoretical, or mixed.
{{User Dog owner}}
{{userbox|red|gold|[[Image:Mosin-Nagant.jpg|44px]]|This user thinks the [[Mosin-Nagant|Mosin-Nagant M91/30]] rocks.}}
A ''pragmatic calendar'' is based on observation; examples are the religious Islamic calendar and the old religious Jewish calendar in the time of the Second Temple. Such a calendar is also referred to as an ''observation-based'' or ''astronomical'' calendar. The advantage of such a calendar is that it is perfectly and perpetually accurate. The disadvantage is that working out when a particular date would occur is difficult.
{{User:Scepia/Sherlockian}}
{{User:BlueSquadronRaven/Userboxes/42}}
A ''theoretical calendar'' is one that is based on a strict set of rules; an example is the current Jewish calendar. Such a calendar is also referred to a ''rule-based'' or ''arithmetical'' calendar. The advantage of such a calendar is the ease of working out when a particular date occurs. The disadvantage is imperfect accuracy. Furthermore, even if the calendar is very accurate, its accuracy perishes slowly over time owing to changes in Earth's rotation. This limits the lifetime of an accurate theoretical calendar to a few thousand years. After then, the rules would need to be modified from observations made since the invention of the calendar, resulting in a mixed calendar.
{{User:Rfrisbie/Userbox/Angel}}
{{Boxboxbottom}}
A ''mixed calendar'' combines the features of both pragmatic and theoretical calendars. Mixed calendars usually begin as theoretical calendars, but are adjusted pragmatically when some type of asynchrony becomes apparent; the shift from the Julian to the Gregorian calendar is such an example.
[[Image:Wikistress3D 1 v3.jpg|left|thumb|180px|'''Wiki Health''']]
[[Image:WMBarnstar.png|thumb|right|For your defense of the use of infoboxes on Non fictional companies I [[User:2000GUN|2000GUN]] award you this Barnstar]]
The Gregorian calendar, as a final example, is complete, solar, and mixed.
==Uses==
The primary practical use of a calendar is to identify days: to be informed about and/or to agree on a future event and to record an event that has happened. Days may be significant for civil, religious or social reasons. For example, a calendar provides a way to determine which days are religious or civil [[holiday]]s, which days mark the beginning and end of business accounting periods, and which days have legal significance, such as the day taxes are due or a contract expires. Also a calendar may, by identifying a day, provide other useful information about the day such as its season.
Calendars are also used as part of a complete [[timekeeping]] system: date and time of day together specify a moment in [[time]]. In the modern world, written calendars are no longer an essential part of such systems, as the advent of accurate [[clock]]s has made it possible to record time independently of astronomical events.
==Currently used calendars==
Calendars in widespread use today include the [[Gregorian calendar]], which is the ''[[de facto]]'' international standard, and is used almost everywhere in the world for civil purposes, including in the [[People's Republic of China]] and [[India]] (along with the [[Indian national calendar]]). Due to the Gregorian calendar's obvious connotations of [[Christianity]], non-Christians sometimes justify its use by replacing the traditional era notations "''[[AD]]''" and "''BC''" ("Anno Domini" and "Before Christ") with "''CE''" and "''BCE''" ("[[Common Era]]" and "Before Common Era"). The [[Hindu calendar]]s are some of the most ancient calendars of the world. The Gregorian calendar is widely used in Israel's business and day-to-day affairs, but the Hebrew calendar is used for religious affairs.
Kurdish calendar is a Solar calendar used among the Kurdish people. The Kurdish year begins on March 21st, at the time of vernal equinox. Kurdish calendar began 612 BC, when the Medes conquered Nineveh and Assyria, which marks and symbolizes the end of lowland tyranny. The year 2007 corresponds to the Kurdish year 2619.<ref>[http://www.kurdistanica.com/english/culture/ncharacters/calendar/converter/kurdish_calendar_converter.html Kurdish calendar converter]</ref>
Also, the [[Iranian calendar|Persian calendar]] is used in [[Iran]] and [[Afghanistan]]. The [[Islamic calendar]] is used by the non-Persian [[Muslim]]s the world over. The [[Chinese calendar|Chinese]], [[Hebrew calendar|Hebrew]], [[Hindu calendar|Hindu]], and [[Julian calendar|Julian]] calendars are widely used for religious and/or social purposes. The [[Ethiopian calendar]] or Ethiopic calendar is the principal calendar used in [[Ethiopia]] and [[Eritrea]].
Even where there is a commonly used calendar such as the Gregorian calendar, alternate calendars may also be used, such as a [[fiscal calendar]] or the astronomical year numbering system<ref>[http://sunearth.gsfc.nasa.gov/eclipse/SEhelp/dates.html NASA - Year Dating Conventions]</ref>.
==Physical calendars==
A calendar is also a physical device (often paper) (for example, a ''desktop calendar''); one sheet can show a single day, a week, a month, or a year. If a sheet is for a single day, it easily shows the date and the weekday. If a sheet is for multiple days it shows a conversion table to convert from weekday to date and back. With a special pointing device, or by crossing out past days, it may show what the current date and weekday is. This is the most common usage of the word.
The sale of physical calendars has been restricted in some countries, and given as a [[monopoly]] to [[University|universities]] and [[National academy|national academies]]. Examples include the [[Prussian Academy of Sciences]] and the [[University of Helsinki]], which had a monopoly on the sale of calendars in [[Finland]] until the [[1990s]].
==See also==
*[[Active calendar]]
*[[Anno Domini]] Christian Era
*[[Aztec Calendar]]
*[[Bahá'í calendar]]
*[[Bengali calendar]]
*[[Calculating the day of the week]]
*[[Calendar of saints]]
*[[Calendar reform]]
*[[Christian calendar]]
*[[Common era]]
*[[Discordian calendar]]
*[[Eastern Orthodox liturgical calendar]]
*[[Ethiopian calendar]]
*[[French Republican Calendar]]
*[[Gregorian calendar]]
*[[hCalendar]]
*[[Hebrew calendar]]
*[[Hindu calendar]]
*[[iCalendar]]
*[[intercalation]]
*[[Iranian calendar]]
*[[Islamic calendar]]
*[[Julian calendar]]
*[[List of calendars]]
*[[Liturgical year]]
*[[Maya calendar]]
*[[Pawukon]] calendar of [[Bali]]
*[[Perpetual calendar]]
*[[Runic calendar]]
*[[Wall calendar]]
*[[Zoroastrian calendar]]
==Sources==
* ''Calendrical Calculations''; Nachum Dershowitz and Edward M. Reingold; Cambridge University Press, 1997; ISBN 0-521-56474-3; [http://emr.cs.iit.edu/home/reingold/calendar-book/second-edition/ Book Info]; [http://emr.cs.iit.edu/home/reingold/calendar-book/Calendrica.html Online Calculator]
* ''Mapping Time, the calendar and its history''; E G Richards; Oxford University Press, 1998; ISBN 0-19-850413-6
* ''A comparative Calendar of the Iranian, Muslim Lunar, and Christian Eras for Three Thousand Years''; Ahmad Birashk; Mazda Publishers, 1993; ISBN 0-939214-95-4
* ''The Comprehensive Hebrew Calendar''; Arthur Spier; Feldheim Publishers, 1986; ISBN 0-87306-398-8
* ''High Days and Holidays in Iceland''; Árni Björnsson; Mál og menning, 1995; ISBN 9979-3-0802-8
* ''Explanatory Supplement to the Astronomical Almanac''; P. Kenneth Seidelmann, ed.; University Science Books, 1992; ISBN 0-935702-68-7; [http://astro.nmsu.edu/~lhuber/leaphist.html Chapter 12: Calendars by L. E. Doggett]
* ''Sun, Moon, and Sothis''; Lynn E. Rose; Kronos Press, 1999; ISBN 0-917994-15-9
* {{cite book|title=Untersuchungen zur Geschichte der Tibetischen Kalenderrechnung|author=Dieter Schuh|___location=Wiesbaden|publisher=Franz Steiner Verlag GMBH|year=1973|id={{OCLC|1150484}}}}
==References==
<references/>
==External links==
{{wiktionarypar|calendar}}
{{Wikisource1911Enc|Calendar}}
*[http://www.tondering.dk/claus/calendar.html Frequently Asked Questions about Calendars]
*[http://88.1911encyclopedia.org/C/CA/CALENDAR.htm 1911 Encyclopaedia Britannica entry]
*[http://webexhibits.org/calendars/calendar.html Various calendars] described as part of the [http://webexhibits.org/calendars/index.html Calendars through the Ages] online exhibit
*[http://kalender-365.de/calendar.php Perpetual Calendar 1800 - 2400]
*[http://www5a.biglobe.ne.jp/~accent/calendar/index.htm Perpetual Calendar]
*[http://www.timeanddate.com/calendar/ Current calendar].
*[http://physics.nist.gov/GenInt/Time/ancient.html ''Ancient Calendars'' NIST website]
*[http://www.dcsi.net/~denmarks/datecalc.html Date calculator]
*[http://www.henryfong.com/10000.htm The Ten Thousand Year Calendar - Western Chinese Calendar Converter]
*[http://www.absolutelyfengshui.com/dateselection/chinese-calendars.php The Chinese Calendars]
*[http://www.chennaiiq.com/astrology/english_date_to_tamil_date_conversion.asp English Date to Tamil Date Conversion]
*[http://www.chennaiiq.com/astrology/tamil_calendar.asp Dynamic Tamil Calendar]
*[http://www.hermetic.ch/cal_stud.htm Calendar Studies] Many articles by several authors on various calendars and calendrical topics.
[[Category:Calendars|*]]
[[ang:Gerímbóc]]
[[ar:تقويم]]
[[ast:Repurtoriu]]
[[bn:পঞ্জিকা (ক্যালেন্ডার)]]
[[zh-min-nan:Le̍k-hoat]]
[[be:Каляндар]]
[[bg:Календар]]
[[ca:Calendari]]
[[cs:Kalendář]]
[[da:Kalender]]
[[de:Kalender]]
[[et:Kalender]]
[[el:Ημερολόγιο]]
[[es:Calendario]]
[[eo:Kalendaro]]
[[fa:گاهشماری]]
[[fr:Calendrier]]
[[fy:Kalinder]]
[[io:Kalendario]]
[[ilo:Calendario]]
[[ia:Calendario]]
[[it:Calendario]]
[[he:לוח שנה]]
[[kn:ಪಂಚಾಂಗ]]
[[la:Calendarium]]
[[lt:Kalendorius]]
[[hu:Naptár]]
[[mi:Maramataka]]
[[nl:Kalender]]
[[ja:暦]]
[[no:Kalender]]
[[pl:Kalendarz]]
[[pt:Calendário]]
[[ru:Календарь]]
[[sk:Kalendár]]
[[sl:Koledar]]
[[sr:Календар]]
[[fi:Kalenteri]]
[[sv:Kalender]]
[[tl:Kalendaryo (artikulo)]]
[[th:ปฏิทิน]]
[[vi:Lịch]]
[[uk:Календар]]
[[ur:تقویم]]
[[yi:קאלענדאר]]
[[zh:历法]]
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