Sources
Holiday data combines date-holidays with reviewed official sources. Moon phases and date conversions are calculated locally.
Date conversion
One date, two calendars
Compare the Gregorian Calendar and the International Fixed Calendar with holidays by country, moon phases, and corresponding dates.
Gregorian
13-month
Rotate your screen or use a larger display to compare both calendars side by side.
Holidays
Your Calendar
Sun
Mon
Tue
Wed
Thu
Fri
Sat
30
31
1
2
3
Selected date: 2026/09/24
30 days this month
Moon Phases
Holidays
International Fixed Calendar
Sun
Mon
Tue
Wed
Thu
Fri
Sat
Selected date: 2026/10/15
28 days every month
Moon Phases
13 Calendar
Dates deserve context
Compare calendars with transparent sources and clearly stated limitations.
Privacy
No account is required. Your language, theme, and country preferences stay in this browser.
Data limitations
Government holiday coverage varies by country and year. The app identifies years without confirmed official dates.