Editing International Calendar/Date marker

<noinclude><noinclude><noinclude><noinclude><noinclude><noinclude>{| class="wikitable"
! Marker !! Mnemonic
! style="width:10ex" | Epoch !! Leap cycle !! Leap items !! Leap rule
|-
! rowspan="2" | ''none''
! rowspan="2" |
| 0001-01-01 || 400 || 1/97 d, 1/71 w || 4:100:400
|-
| colspan="4" | by majority of days
<noinclude>
|-
! rowspan="2" | A || rowspan="2" | alternative, academic; ancient; Armenian
| ? || ? || ? || ? 
|-
| colspan="4" | ?
|-
! rowspan="2" | B || rowspan="2" | biblical, [[Babylonian calendar|Babylonian]]; [[Bahá'í calendar|Baháʼí]]; [[Buddhist calendar|Buddhist]]
| ? || ? || ? || like default 
|-
| colspan="4" | week starts Sunday
|-
! rowspan="2" | C || rowspan="2" | [[Civil calendar|civil]]; Christian, church; [[Chinese calendar|Chinese]]; [[Celtic calendar|Celtic]]; [[Coptic calendar|Coptic]]
| ? || ? || ? || ? 
|-
| colspan="4" | ?
</noinclude>
|-
! rowspan="2" | D
! rowspan="2" | default, date, day<noinclude>
; [[Dee-Cecil Calendar|Dee-Cecil]]</noinclude>
| 2001-01-01 || <noinclude>293</noinclude>? || ? || <noinclude>23:22, 28:34, …</noinclude>?
|-
| colspan="4" | ?
|-

! rowspan="2" | E
! rowspan="2" | [[Egyptian calendar|Egyptian]]; [[Enoch Calendar|Enoch]]; [[Ethiopian calendar|Ethiopian]]
| ? || ? || ? || ?
|-
| colspan="4" | ?
</noinclude>
|-
! rowspan="2" | F
! rowspan="2" | financial, fiscal
| custom || 400 || 5–6/2097 d || 4:100:400
|-
| colspan="4" | 360-day year aligned with standard count, week unused
|-
! rowspan="2" | G
! rowspan="2" | Gregorian, global
| 1582-10-15 || 400 || 1/97 d, -02-29 || 4:100:400
|-
| colspan="4" | weeks begin Sunday, the first Sunday of January starts W01, days before that belong to W00, weeks do not span year boundaries, i.e. they can be partial, dates before the epoch are equal to '''J'''.
<noinclude>
|-
! rowspan="2" | H
! rowspan="2" | historic; Hijri; Hindu; Hebrew?
| ? || — || — || none, 365-day year
|-
| colspan="4" | years begin -03-01 at any day of the week, the standard week cycle is used
</noinclude>
|-
! rowspan="2" | I <noinclude>≠ 1</noinclude>
! rowspan="2" | international<noinclude>
; [[Indian national calendar|Indian]]; [[Islamic calendar|Islamic]]</noinclude>
| 2001-01-01 || 293 || 1/71 d, 1/52 w, 1/13 m, 1/4 q || ?
|-
| colspan="4" | inherent
|-
! rowspan="2" | J
! rowspan="2" | [[Julian Calendar|Julian]]
<noinclude>
; [[Jewish calendar|Jewish]]</noinclude>
| [[ab urbe condita|AUC]] || 4 || 1/1 d || every fourth year a day is added to the last month, i.e. February
|-
| colspan="4" | years begin -03-01 at any day of the week, the standard week cycle is used
|-
! rowspan="2" | K
! rowspan="2" | [[Symmetry454 Calendar|Kalendis]]
| 2001-01-01 || 293 || 1/52 w || distribution as even as possible, 45:79 sub cycles
|-
| colspan="4" | inherent
<noinclude>
|-
! rowspan="2" | L || rowspan="2" | [[lunar calendar|lunar]], lunation
| ? || ? || ? || ? 
|-
| colspan="4" | ?
|-
! rowspan="2" | M || rowspan="2" | moon, month, [[Metonic cycle|Meton]], monetary, [[Islamic calendar|Muslim]]
| ? || ? || ? || ? 
|-
| colspan="4" | ?
</noinclude>
|-
! rowspan="2" | N
! rowspan="2" | no leap, null year; new
| 2001-01-01 || 293 || 1/1 y || years have 364 days, every 294th year is year zero of the next cycle which then aligns once again with the 293-year cycle
|-
| colspan="4" |
|-

! rowspan="2" | O ≠ 0
! rowspan="2" | old
| ? || ? || ? || ?
|-
| colspan="4" | ?
|-
! rowspan="2" | Q
! rowspan="2" | quarter; [[Qumran Calendar|Qumran]]?
| ? || ? || ? || ?
|-
| colspan="4" | ?
|-
! rowspan="2" | S
! rowspan="2" | season, solar, sun, solstice
| ? || ? || ? || ?
|-
| colspan="4" | W01 contains / starts after Northern winter solstice
</noinclude>
|-
! rowspan="2" | U
! rowspan="2" | user
| custom || custom || custom || custom
|-
| colspan="4" | custom
|-

! rowspan="2" | V
! rowspan="2" | [[Vedic calendar|Vedic]]
| ? || ? || ? || ?
|-
| colspan="4" | ?
|-
! rowspan="2" | W
! rowspan="2" | week
| ? || ? || ? || ?
|-
| colspan="4" | ?
|-
|-
! rowspan="2" | Y || rowspan="2" | year
| ? || ? || ? || ? 
|-
| colspan="4" | ?
|-
! rowspan="2" | Z || rowspan="2" | zodiac; Zoroastrian
| ? || ? || ? || ?
|-
| colspan="4" | W01 contains / starts after Northern spring equinox ?
</noinclude>
|}
<noinclude>
The markers ‘P’, ‘R’ and ‘T’ are reserved, as is ‘X’, and must not be used. The letters ‘F’, ‘L’, ‘M’, ‘Q’, ‘S’ and ‘W’ should not be used as date markers unless they are semantically compatible with like markers defined herein.

The year count needs to be compatible with the ±CCYY format. This means, among other restrictions, it may not be shorter than 4 digits, except when the cycle length is smaller than 100 years, because YY may be used then. Note, though, that the year count does not have to be purely incremental, i.e. the last three or four digits may be used for counting years of a cycle and then do not necessarily run through 999 or 9999.
</noinclude>
<noinclude>[[Category:Subpage]]</noinclude>