Converting 29 February to a Hijri Date: What to Check

First check that 29 February exists

When converting a Gregorian date of 29 February, confirm the year before interpreting the Hijri result. A date can look familiar and still be invalid for the year entered.

The US Naval Observatory explains the Gregorian rule: years divisible by four are leap years, except century years that are not divisible by 400. Thus 2028 has a leap day, while 2100 does not. This is the Gregorian rule, not the rule for a tabular Hijri leap year.

Use a fixed date and fixed settings

For a practical check on AL-Naqawa, select Gregorian-to-Hijri conversion, enter 29 February 2028, choose Umm al-Qura and leave the day adjustment at zero. Read the converted result together with those settings.

The example is a calendar calculation for a future civil date. It is not a forecast of an observed religious occasion. If you switch methods or adjustment, keep the change in your note instead of comparing two numbers whose inputs differ.

Keep enough detail to repeat the conversion

A short record should let another reader enter the same values and understand the direction of the calculation. Include the original date even when sharing the Hijri result.

• Gregorian input: 2028-02-29.
• Direction: Gregorian to Hijri.
• Hijri calculation: Umm al-Qura.
• Day adjustment: 0.
• Result and the date on which you checked it.

Do not copy the leap-day assumption into another calendar

The extra Gregorian day does not mean that the corresponding Hijri year has an extra month or uses the same leap-year rule. Use the selected Hijri method to perform the conversion rather than moving a date by an assumed annual offset.

If you are matching a historical family record, retain the original document’s calendar notation and any local context. For religious observances, confirm the applicable local announcement separately. A calculator output is useful planning information, not proof of a sighting or a substitute for the original record.