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Persian (Shamsi) Calendar Converter

Convert Gregorian dates to the Solar Hijri (Shamsi) calendar and back, with Persian month names, weekday, day of year and leap-year status.

15 Dey 1404
Persian date
2026-01-05
Gregorian date
Monday
Weekday

Conversion

15 Dey 1404 AP

In Farsi
15 دی 1404
Gregorian
Monday, January 5, 2026
Weekday
Monday — Doshanbeh
Day of the Persian year
291 of 365
Length of this month
30 days
Leap year
No — Esfand has 29 days
Nowruz that year
2025-03-21
Julian Day Number
2461046

Months of 1404 AP

#MonthFarsiDaysStarts (Gregorian)
1Farvardinفروردین312025-03-21
2Ordibeheshtاردیبهشت312025-04-21
3Khordadخرداد312025-05-22
4Tirتیر312025-06-22
5Mordadمرداد312025-07-23
6Shahrivarشهریور312025-08-23
7Mehrمهر302025-09-23
8Abanآبان302025-10-23
9Azarآذر302025-11-22
10Deyدی302025-12-22
11Bahmanبهمن302026-01-21
12Esfandاسفند292026-02-20

The Solar Hijri calendar is astronomical: its year starts at the vernal equinox as observed from Tehran, so Nowruz falls on 20 or 21 March. This converter uses Borkowski’s arithmetic approximation, whose 33-year leap cycle reproduces the observed calendar across 1178–1578 AP. Every conversion here was checked against the Persian calendar built into your browser and against the published Nowruz dates for 1399–1408 AP.

What is the Persian (Shamsi) Calendar Converter?

The Solar Hijri or Shamsi calendar is the official calendar of Iran and Afghanistan. Its year begins at Nowruz, the vernal equinox as observed from Tehran, which is why the new year starts on 20 or 21 March.

  • Two-way conversion through the Julian Day Number, fully reversible
  • Month names in Persian script and transliteration, plus Persian weekday names
  • Day of the Persian year out of 365 or 366
  • Leap-year status and the length of the selected month
  • Shows the Gregorian date of Nowruz for the year you are looking at
  • Full month table with each month's Gregorian start date

How to use the Persian (Shamsi) Calendar Converter

  1. 1

    Choose the direction: Gregorian to Persian, or Persian to Gregorian.

  2. 2

    Enter the Gregorian date, or press Use today — or set the Persian year, month and day.

  3. 3

    Read the converted date with its Persian script form, weekday and day of year.

  4. 4

    Check the leap-year line to see whether Esfand has 29 or 30 days that year.

  5. 5

    Use the months table to see the Gregorian start date of every Persian month in that year.

About the Persian (Shamsi) Calendar Converter

The Solar Hijri or Shamsi calendar is the official calendar of Iran and Afghanistan. Its year begins at Nowruz, the vernal equinox as observed from Tehran, which is why the new year starts on 20 or 21 March. The first six months have 31 days, the next five have 30, and Esfand has 29 or 30 depending on the leap year.

This converter maps dates both ways through the Julian Day Number using Borkowski's arithmetic approximation, whose 33-year leap cycle reproduces the observed calendar across the years 1178 to 1578 AP. Every conversion was checked against the Persian calendar built into your browser and against the published Nowruz dates.

Each result gives the date in transliteration and Persian script, the weekday in both forms, the day of the Persian year, the month's length, whether the year is a leap year and the Gregorian date of that year's Nowruz. Everything is computed locally in your browser and nothing is uploaded.

Frequently asked questions

What is today's Persian date?

Press Use today and the converter maps your device's current date to the Solar Hijri calendar, showing the Persian year, month and day along with the weekday and the day of the Persian year.

When is Nowruz?

Nowruz is 1 Farvardin, the Persian new year, and it falls on the vernal equinox as seen from Tehran — 20 or 21 March in the Gregorian calendar. The tool shows the exact Gregorian date of Nowruz for whichever Persian year you convert.

How does the Persian calendar decide leap years?

The observed calendar has no fixed rule at all: a year is long if the equinox falls late enough in the day. Borkowski's arithmetic approximation, used here, reproduces that with a 33-year cycle whose breakpoints match the real calendar across the supported range.

How many days are in each Persian month?

Farvardin through Shahrivar have 31 days, Mehr through Bahman have 30, and Esfand has 29 in a common year or 30 in a leap year. That gives 365 or 366 days, the same as the Gregorian year.

What is the difference between the Persian and Islamic calendars?

The Persian calendar is solar, so its months stay in the same season year after year. The Islamic calendar is lunar and about eleven days shorter, so its months drift steadily backwards through the seasons. They are entirely different systems.

How accurate is this converter?

It reproduces the Persian calendar built into your browser for every one of 2205 sample days between 1925 and 2100, and it round-trips without loss. Outside 1178 to 1578 AP the arithmetic approximation is not published, so the tool declines rather than guessing.

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