Find your calendar twin
Discover which years share exactly the same calendar.
2027 has the same calendar as 2021, 2010, 1999…
2027 starts on a Friday and has 365 days.
Showing matches from 1927 to 2127.
A 2021 calendar works for 2027.
All dates share weekdays: both years start on a Friday and have 365 days.
Showing January 2027 and January 2021.
| Sunday | Monday | Tuesday | Wednesday | Thursday | Friday | Saturday |
|---|---|---|---|---|---|---|
| 1 | 2 | |||||
| 3 | 4 | 5 | 6 | 7 | 8 | 9 |
| 10 | 11 | 12 | 13 | 14 | 15 | 16 |
| 17 | 18 | 19 | 20 | 21 | 22 | 23 |
| 24 | 25 | 26 | 27 | 28 | 29 | 30 |
| 31 |
| Sunday | Monday | Tuesday | Wednesday | Thursday | Friday | Saturday |
|---|---|---|---|---|---|---|
| 1 | 2 | |||||
| 3 | 4 | 5 | 6 | 7 | 8 | 9 |
| 10 | 11 | 12 | 13 | 14 | 15 | 16 |
| 17 | 18 | 19 | 20 | 21 | 22 | 23 |
| 24 | 25 | 26 | 27 | 28 | 29 | 30 |
| 31 |
Dates and weekdays match. Movable holidays and moon phases may differ.
How calendar twins work
Two years share a calendar when 1 January falls on the same weekday and both are leap years or both are common years. That makes 14 possible calendars, and every date in twin years falls on the same weekday.
Leap years come every four years, except century years not divisible by 400: 2000 was a leap year, but 1900 and 2100 are not. Those exceptions break simple 28-year cycles, so the tool checks each year instead of assuming a pattern.
Results use the Gregorian calendar from 1583, its first full year, to 3000. Britain and its colonies, including those in America, used the Julian calendar until 1752, so their earlier dates do not follow these calendars.
Frequently asked questions
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