Grenebolym

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Time Converter
Three days on Earth is equal to 2 days on Cas-Pianet. And the orbital period of Cas-Pianet is about twice as much as Earth. (730.48 Earth Days) A year on a Grenebolym calendar is 487 days. Just like on Earth, this creates a calendar issue, but one not as easy as Earth's calendar. An orbital rotation is closer to 486+74/75. Every 75 years, they add a day to the calendar. See Cas-Pianet for more info on the planet.

TLDR:
1 Earth Day = 2/3 Cas-Pianet Day

1 Earth Year = 2 Cas-Pianet Years

Calendar
9 days a week

3 weeks a month

18 months in a year

+1 day for celebration

Every 75 years, an extra celebration day

Monthly Calendar Year Calendar