Jalali ↔ Gregorian Date Converter
Accurate conversion between Jalali, Gregorian and Hijri calendars.
About Jalali ↔ Gregorian Date Converter
The Persian solar calendar is anchored to astronomical observation of the vernal equinox rather than a simple formula, which is why many date libraries get its leap years wrong. This converter uses the reference algorithm with the full leap-cycle table and computes the weekday correctly too.
How to use Jalali ↔ Gregorian Date Converter
- 1
Enter either a Persian or a Gregorian date in the matching field.
- 2
Conversion happens live in the opposite direction.
- 3
The weekday is shown below the result.
- 4
Use the today button to jump back to the current date.
Frequently asked questions
Why do some converters differ by a day?
Usually two reasons: incorrect leap year handling, or ignoring time zones. A converter that works in UTC can land a day off for a user who is three and a half hours ahead.
How are Persian leap years determined?
By irregular 33-year cycles defined in a reference table, not the simple divisible-by-four rule of the Gregorian calendar. That is exactly why hand calculation is so error-prone.
What date range is supported?
The reference table covers a very wide span and is accurate for every practical date, from historical records to future planning.