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User:DennouNeko/Time test

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Disclaimer: This is highly experimental, purely speculational work, based on few uncertain dates from Gensokyo Timeline. It should serve at most for approximation of dates.

It uses Module:Timeconv for conversions between Gregorian date and Julian day, or between Julian day and Gensokyo's Lunisolar calendar.

Assumptions:

  • Margin of error of dates specified at Gensokyo Timeline is no more than +/- 2 days
  • Gensokyo uses luni-solar calendar (29.5 days per month).
  • Season starts with uzuki month, so it's the 1st month (to make the calculations easier)
  • There may be a leap month between 9th and 10th months (between Gregorian December and January). It's numbered as 13, so there may be seasons with month sequence: ...8, 9, 13, 10, 11...

Conversion verification

Original Julian date Converted
118/4/15 2452863.5 118/4/15 (Tuesday)
118/13/29 2453172.5 119/1/29 (Wednesday)
118/12/29 2453142.5 118/12/29 (Monday)
118/12/30 2453143.5 118/12/30 (Tuesday)
119/1/1 2453144.5 119/1/1 (Wednesday)
119/5/14 2453275.5 119/5/14 (Monday)
119/6/15 2453306.5 119/6/15 (Thursday)

Time difference tests

Gregorian Gensokyo delta JD corrected Gensokyo
2003.08.12 118/4/15 0 118/4/15 (Tuesday)
delta 270 271
2004.05.08 118/12/21 -1 118/12/20 (Saturday)
delta 10 10
2004.05.18 119/1/1 -1 118/12/30 (Tuesday)
delta 132 131
2004.09.27 119/5/14 0 119/5/14 (Monday)
delta 32 31
2004.10.29 119/6/15 1 119/6/16 (Friday)

Leap season test

Script error: The function "test" does not exist.

Month sequence test

  • Regular season (117)
  • 117, season of sun, summer and water
month: 1 2 3 4 5 6 7 8 9 10 11 12
days: 30 29 30 29 29 30 29 30 29 30 30 29
  • Leap season (118)
  • 118, season of moon, autumn and wood
month: 1 2 3 4 5 6 7 8 9 10 11 -11 12
days: 30 30 29 30 29 29 30 29 30 29 30 29 30

Season 0 and current date

Calculations for: 2024.03.29 00:00 (GMT)

Current Gregorian date: 2024.03.29 (Friday))
Current Gensokyo date: 138/11/20 (Friday)
0/1/1: 1885.05.15 (Friday))