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Leap Year Day Comparisons

These are the comparisons on where the leap year days were placed on the calendars using the Kalends method of counting down, and the Countup method of sequential numbering of the days of the month. We also compare the Julian to the Gregorian calendars using both the Kalends and Countup day numbering methods using the modern names of the months. Although I'm not sure if the Gregorian calendar with the Kalends version is in use anywhere in the world, I'll use it for comparing between the four calendars.

I'll begin the comparisons with the year A.D. 8 or 8 C.E. Also note where the leap year days were placed on the Countup and Kalends versions of the calendars. On the Kalends versions, the leap year day was the equivalent of February 24, but on the Countup versions, it may look like February 29 is the leap year day, but by tradition February 24 would be the real leap year day when February is 29 days long.

The leap year days are in orange.

Gregorian CountupGregorian KalendsJulian CountupJulian Kalends
Mar 02, 0008a.d. VI Non.Mar 04, 0008a.d. IV Non.
Mar 01, 0008Kal.Mar 03, 0008a.d. V Non.
Feb 29, 0008Prid. Kal.Mar 02, 0008a.d. VI Non.
Feb 28, 0008a.d. III Kal.Mar 01, 0008Kal.
Feb 27, 0008a.d. IV Kal.Feb 29, 0008Prid. Kal.
Feb 26, 0008a.d. V Kal.Feb 28, 0008a.d. III Kal.
Feb 25, 0008a.d. VI Kal.Feb 27, 0008a.d. IV Kal.
Feb 24, 0008a.d. bis. VI Kal.Feb 26, 0008a.d. V Kal.
Feb 23, 0008a.d. VII Kal.Feb 25, 0008a.d. VI Kal.
Feb 22, 0008a.d. VIII Kal.Feb 24, 0008a.d. bis. VI Kal.
Feb 21, 0008a.d. IX Kal.Feb 23, 0008a.d. VII Kal.
Feb 20, 0008a.d. X Kal.Feb 22, 0008a.d. VIII Kal.

For the year A.D. 100 or 100 C.E., the Gregorian calendar skipped a leap year day (no leap year days on years that are divisible by 100 but not by 400) so that it would be behind the Julian calendar by one day. On the Kalends version of the Gregorian calendar, it would skip bis. VI Kal., and on the Countup version, it would skip 29.

Gregorian CountupGregorian KalendsJulian CountupJulian Kalends
Mar 03, 0100a.d. V Non.Mar 04, 0100a.d. IV Non.
Mar 02, 0100a.d. VI Non.Mar 03, 0100a.d. V Non.
Mar 01, 0100Kal.Mar 02, 0100a.d. VI Non.
Feb 29, 0100 skipped
Feb 28, 0100Prid. Kal.Mar 01, 0100Kal.
Feb 27, 0100a.d. III Kal.Feb 29, 0100Prid. Kal.
Feb 26, 0100a.d. IV Kal.Feb 28, 0100a.d. III Kal.
Feb 25, 0100a.d. V Kal.Feb 27, 0100a.d. IV Kal.
Feb 24, 0100a.d. VI Kal.Feb 26, 0100a.d. V Kal.
a.d. bis. VI Kal. skipped
Feb 23, 0100a.d. VII Kal.Feb 25, 0100a.d. VI Kal.
Feb 22, 0100a.d. VIII Kal.Feb 24, 0100a.d. bis. VI Kal.
Feb 21, 0100a.d. IX Kal.Feb 23, 0100a.d. VII Kal.
Feb 20, 0100a.d. X Kal.Feb 22, 0100a.d. VIII Kal.

For the year A.D. 200 or 200 C.E., the Gregorian calendar skipped Feb 29 on the Countup version (bis. VI Kal. on the Kalends version) so that it would line up with the Julian calendar for 100 years. The date range between the two versions vary. For the Countup versions, the date range for both calendars lining up are March 1, A.D. 200 through February 28, A.D. 300. For the Kalends versions, the date range would be a.d. VI Kal. Mart. A.D. 200 through VII Kal. Mart. A.D. 300.

Gregorian CountupGregorian KalendsJulian CountupJulian Kalends
Mar 04, 0200a.d. IV Non.Mar 04, 0200a.d. IV Non.
Mar 03, 0200a.d. V Non.Mar 03, 0200a.d. V Non.
Mar 02, 0200a.d. VI Non.Mar 02, 0200a.d. VI Non.
Mar 01, 0200Kal.Mar 01, 0200Kal.
Feb 29, 0200 skipped
Feb 28, 0200Prid. Kal.Feb 29, 0200Prid. Kal.
Feb 27, 0200a.d. III Kal.Feb 28, 0200a.d. III Kal.
Feb 26, 0200a.d. IV Kal.Feb 27, 0200a.d. IV Kal.
Feb 25, 0200a.d. V Kal.Feb 26, 0200a.d. V Kal.
Feb 24, 0200a.d. VI Kal.Feb 25, 0200a.d. VI Kal.
a.d. bis. VI Kal. skipped
Feb 23, 0200a.d. VII Kal.Feb 24, 0200a.d. bis. VI Kal.
Feb 22, 0200a.d. VIII Kal.Feb 23, 0200a.d. VII Kal.
Feb 21, 0200a.d. IX Kal.Feb 22, 0200a.d. VIII Kal.
Feb 20, 0200a.d. X Kal.Feb 21, 0200a.d. IX Kal.

Here's what the days going through leap year day A.D. 300 looked like between the two calendars as the Gregorian calendar would be ahead of the Julian calendar by one day as the former skips the leap year day.

Gregorian CountupGregorian KalendsJulian CountupJulian Kalends
Mar 04, 0300a.d. IV Non.Mar 03, 0300a.d. V Non.
Mar 03, 0300a.d. V Non.Mar 02, 0300a.d. VI Non.
Mar 02, 0300a.d. VI Non.Mar 01, 0300Kal.
Mar 01, 0300Kal.Feb 29, 0300Prid. Kal.
Feb 29, 0300 skipped
Feb 28, 0300Prid. Kal.Feb 28, 0300a.d. III Kal.
Feb 27, 0300a.d. III Kal.Feb 27, 0300a.d. IV Kal.
Feb 26, 0300a.d. IV Kal.Feb 26, 0300a.d. V Kal.
Feb 25, 0300a.d. V Kal.Feb 25, 0300a.d. VI Kal.
Feb 24, 0300a.d. VI Kal.Feb 24, 0300a.d. bis. VI Kal.
a.d. bis. VI Kal. skipped
Feb 23, 0300a.d. VII Kal.Feb 23, 0300a.d. VII Kal.
Feb 22, 0300a.d. VIII Kal.Feb 22, 0300a.d. VIII Kal.
Feb 21, 0300a.d. IX Kal.Feb 21, 0300a.d. IX Kal.

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