Palindrome Date Calculator
Check whether a date is a palindrome (reads the same forwards and backwards), and find the next palindrome date.
How to use the calculator
- Choose a date.
- The calculator checks whether the date is a palindrome in two common formats — YYYYMMDD (ISO) and DDMMYYYY — and finds the next palindrome date in each format if the chosen date isn't one.
What is a palindrome date?
A palindrome date is a date that, written as a string of digits with no separators, reads the same forwards and backwards. A famous example is 02/02/2020 (in DDMMYYYY format: 02022020), which got a lot of international attention precisely because it was a palindrome date.
Since different countries write dates in different orders (day-month-year, month-day-year, or the ISO year-month-day standard), a date can be a palindrome in one format but not another — that's why the calculator shows both.
Frequently asked questions
Why isn't the date a palindrome in both formats at once?
Because the order of day, month, and year differs between ISO format and DD-MM-YYYY format — a digit sequence can be a palindrome in one order without being one in the other.
How far ahead does the calculator search for the next palindrome date?
Up to 20,000 days (about 55 years) into the future — more than enough to find the next palindrome date in almost all cases.
Are there other date formats that could be checked?
Yes, in practice there are many notations (with/without century, MM-DD-YYYY as used in the US, etc.) — this calculator focuses on the two most common: ISO and DD-MM-YYYY.