The fictional Biblical Calendar or Genesis Calendar accompanies the Modern Christian Calendar or any other solar calendar with 293 years per leap cycle. It is intended to be a ceremonial calendar only and not for secular use, since it tracks the course of neither the sun nor the moon.

Genesis parallel calendar with 7-week month, 7-month (343-day) year
Week of Month 1 2 3 4 5 6 7
Day of Month 1–7 8–14 15–21 22–28 29–35 36–42 43–49
Month of Year 1 2 3 4 5 6 7
Week of Year 1–7 8–14 15–21 22–28 29–35 36–42 43–49
Day of Year 1–4950–9899–147148–196197–245246–294295–343
Year of Cycle 1 2 3 4 5 6 7 (8)
Month of Cycle 1–7 8–14 15–21 22–28 29–35 36–42 43–49 50–56
Week of Cycle 1–4950–9899–147148–196197–245246–294295–343344–392

In the Biblical Calendar, the seventh day, week and month are holidays, i.e. 121 of 343 days per year are not work days.

After ten Cycles (alias Commandments) of seven 343-day years, there is one long Cycle containing eight years. These eleven Cycles make an Age, of 78 years. Four Ages, i.e. 312 years, make an Era, of 2148 months or 15288 weeks. This is equal to 294 years of 52 weeks without any leaping or to 293 years with either 52 leap weeks or 71 leap days.

Although it would be possible to align the year better with solar calendars by extending 3 of the 7 months to 8 weeks and 4 of them in leap years (i.e. 52+1 weeks per year) as done in Cal7, this would be against the spirit of this calendar which mandates each (sub-year) cycle to contain seven items exactly and each last one being sacred.

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