Date Format Converter
Convert validated Gregorian dates between ISO, Indonesian, US, UK, and common developer formats.
Dates are parsed and formatted locally without time zone shifts.
Date conversion
DD/MM/YYYY versus MM/DD/YYYY
The string 03/04/2026 could mean 3 April or 4 March. This tool requires an explicit input format, validates the calendar date, and never guesses. Year values must have four digits in the MVP.
ISO 8601 date
An ISO date such as 2026-10-19 represents a calendar date only. This tool does not append Z or a UTC offset because that would imply time-of-day or time zone information that is not present.
Frequently asked questions
Does the browser time zone change the date?
No. Validated calendar components are formatted through UTC to prevent a date from shifting by one day.
Is 29 February 2025 valid?
No. 2025 is not a leap year. 29 February 2024 is valid.
Are non-Gregorian calendars supported?
No. The MVP uses the Gregorian calendar only.