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Plan · Reflect · Return

Make time
for reflection.

Bring dates into conversation: Hijri, Hebrew, Gregorian, Persian, Ethiopian, Maya, Julian, and astronomical day counts. Every conversion runs in your browser.

Calculated civil dates · No account needed

Date tools · In this Alpha

Nine calendars.
One civil day.

Choose any calendar as the input; see all nine results together. Gregorian and Julian years extend backward using their named rules. Each card states its calculation method. The supported interval runs from 7 September 3761 BCE through 31 December 9999 CE in the proleptic Gregorian calendar.

These are date-only calculations. Hijri and Hebrew religious days begin at sunset; no location or sunset is inferred. Civil Hijri dates can differ from local moon-sighting observances. Historical conversions do not establish when a community observed a date.

CE/BCE use positive historical year numbers. For the extended Persian, Hijri and Ethiopian calculation years, signed years include zero. Hebrew years start at 1.

The same day, across calendars

Browse a Hijri month · 1900–2100

Choose a month’s date

The month grid uses the tabular civil Hijri method. Selecting a day also updates the nine-calendar converter.

Hijri month

Large number: Hijri day · Small number: Gregorian day/month.

SunMonTueWedThuFriSat

Everyday date arithmetic

The following Gregorian date fields support 1900–2100. The nine-calendar converter above also supports historical dates.

Count a span

Days between dates

Elapsed days exclude the starting date. The inclusive count includes both endpoints.

Look ahead or back

Add or subtract days

Use a negative number to subtract. A day means one calendar date, independent of daylight-saving clock changes.

Understand the calculation

A method you can see.

Conventions matter

The Hijri conversion uses the named islamic-civil Friday-epoch convention, not Umm al-Qura or live sightings. Hebrew uses the fixed calendar with Nisan as month 1. Persian/Shamsi uses astronomical year boundaries; extended dates are estimates, not official historical dates. Julian calendar dates and Julian Day numbers are different systems.

AH means the Hijri year count, SH the Solar Hijri count, and AM the named Hebrew or Ethiopian era. JD starts at noon; MJD = JD − 2,400,000.5 starts at midnight. Fractional day-count inputs are retained in the download; cards describe their containing civil day. No entered date or location is sent to a calendar service.

Sources and further reading

US Naval Observatory: the Islamic calendar explains the tabular cycle and epoch. Unicode: calendar identifiers distinguishes civil Hijri from other Islamic calendar methods.

USNO: Julian Date explains astronomical day counts. Calculation sources and conventions identify the arithmetic and astronomical table. Community calendars, sourced history, and reading plans remain future additions; see what’s coming.