Palindrome Date Finder
Check if any date is a palindrome — a date whose digit sequence reads the same forwards and backwards. This tool checks 6 common date formats: MM/DD/YYYY, DD/MM/YYYY, YYYY/MM/DD, MMDDYYYY, DDMMYYYY, and YYYYMMDD. February 2, 2020 (02022020) was a palindrome in all formats simultaneously — an event that happens only a few times per millennium.
Palindrome Date Finder
Check if a date is a palindrome in any of 6 common date formats. Find the next and previous palindrome dates.
Saturday, March 28, 2026
All Date Formats
03/28/2026
28/03/2026
2026/03/28
03282026
28032026
20260328
Previous Palindrome Date
Tuesday, February 22, 2022
DD/MM/YYYY, DDMMYYYY
Next Palindrome Date
Sunday, February 3, 2030
DD/MM/YYYY, DDMMYYYY
Frequently Asked Questions
What is a palindrome date?
A palindrome date is a calendar date whose digit sequence reads the same forwards and backwards in a specific date format. For example, February 2, 2020 written as 02022020 (MM/DD/YYYY format) is a palindrome because the digits are the same when reversed.
Is 02/02/2020 a palindrome date?
Yes! February 2, 2020 (02/02/2020) is one of the most famous palindrome dates in history. The digit string 02022020 reads the same forwards and backwards. Remarkably, it was a palindrome in ALL major date formats simultaneously (MMDDYYYY, DDMMYYYY, and YYYYMMDD), which happens only a few times per millennium.
When is the next palindrome date?
Palindrome dates in the MMDDYYYY format occur roughly once per decade. In the 21st century, notable palindrome dates include 01/02/2010, 11/02/2011, 02/02/2020, and 12/02/2021. Use the calculator above to find the exact next palindrome date from any starting date.
How rare are palindrome dates?
Palindrome dates occur approximately 12 times per century in the MMDDYYYY format. They are much rarer in ISO format (YYYYMMDD) where the constraints are tighter. Universal palindrome dates (palindrome in all formats simultaneously) occur only a few times per millennium.
Was 12/02/2021 a palindrome date?
Yes! December 2, 2021 written in MMDDYYYY format gives 12022021. Reversed: 12022021. These digits are the same forwards and backwards, making it a palindrome in the US date format.
What date formats are checked for palindromes?
This calculator checks 6 date formats: MMDDYYYY (US), DDMMYYYY (European), YYYYMMDD (ISO 8601), MM/DD/YYYY, DD/MM/YYYY, and YYYY/MM/DD. The palindrome check looks at only the digit characters, ignoring any slash separators.
What was the last universal palindrome date (palindrome in all formats)?
The most recent universal palindrome date was 02/02/2020, which was palindromic in all major date formats. Before that, 11/11/1111 was palindromic in all formats. These events are extremely rare because all three common formats (MM/DD/YYYY, DD/MM/YYYY, and YYYY/MM/DD) must be simultaneously palindromic.
Can any date be a palindrome in every format?
For a date to be a palindrome in both MMDDYYYY and DDMMYYYY simultaneously, the month and day numbers must be the same or the format constraint must naturally align. For YYYYMMDD to also be palindromic, the year digits must mirror the month and day digits. This combination is extremely rare, which is why 02/02/2020 was so celebrated.
About the Palindrome Date Finder
What Is a Palindrome Date?
A palindrome date is a calendar date whose digits read the same forwards and backwards when written in a specific date format. For example, February 2, 2020 written as 02/02/2020 gives the digit string "02022020" — which is a palindrome (reads the same in both directions).
Palindrome dates are a fun mathematical curiosity. They occur rarely — sometimes decades apart — making each one a minor celebration for number enthusiasts worldwide.
Date Formats Checked
This calculator checks 6 different date formats for palindrome properties:
| Format | Example (Feb 2, 2020) | Region |
|---|---|---|
| MMDDYYYY | 02022020 | United States |
| DDMMYYYY | 02022020 | Europe, International |
| YYYYMMDD | 20200202 | ISO 8601 / Asia |
| MM/DD/YYYY | 02/02/2020 | US slashed format |
| DD/MM/YYYY | 02/02/2020 | EU slashed format |
| YYYY/MM/DD | 2020/02/02 | ISO slashed format |
Note: The palindrome check uses only the digit characters (ignoring slashes or separators).
Famous Palindrome Dates
02/02/2020
Palindrome in ALL 6 formats — the rarest kind! First such date in 909 years.
12/02/2021
Palindrome in MMDDYYYY (12022021) and DDMMYYYY (21022021 reversed = 12022021... wait, let's check: 21022021 reversed = 12022012, not palindrome — only MMDDYYYY).
01/02/2010
Palindrome in MMDDYYYY (01022010 reversed = 01022010 — yes!)
11/11/1111
Historical palindrome — MMDDYYYY gives 11111111, a full palindrome
02/02/2020 was particularly special: the first date in recorded history that was a palindrome in all major date formats simultaneously. The previous such date was 11/11/1111, over 900 years earlier.
How Rare Are Palindrome Dates?
The frequency of palindrome dates depends on the date format:
- MMDDYYYY format: About 12 palindrome dates per century
- DDMMYYYY format: Similar frequency, different dates (except when month = day)
- YYYYMMDD (ISO): Very rare — the digit structure makes palindromes harder; often decades apart
- Universal palindromes (all formats): Extremely rare — only a handful per millennium
How the Algorithm Works
- Format the date as a digit string in each of the 6 formats (zero-padded month and day)
- Strip any separator characters (slashes) from the string
- Compare the digit string to its reversal using JavaScript string operations
- If the string equals its own reversal, it's a palindrome in that format
- To find the next palindrome date, iterate forward day by day until a palindrome is found