Ordinal Numbers, Fractions, and Dates in Farsi

Numbers Are Only Half the Story

When I first learned to count in Farsi, I thought I was done. Yek, do, se, chahâr… all the way to hazâr. Then my uncle asked me when my birthday was in the Iranian calendar, and I realized I couldn’t say “the fifteenth of Mehr” because I’d never learned ordinal numbers. Or fractions. Or how Iran’s entire calendar works differently from the one I grew up with.

If you’ve already learned Persian cardinal numbers, this post is the second half. Ordinals (first, second, third), fractions (half, quarter, third), and the Solar Hijri calendar that Iran uses every day. All of it in both formal and spoken Tehrani, because the differences are real and they matter.

Ordinal Numbers: The -om Suffix

Farsi turns any cardinal number into an ordinal by adding ـُم (-om). That’s it. One rule, no exceptions worth worrying about.

Notice “first” has two forms: یکم (yekom) and اول (avval). Avval is borrowed from Arabic and is more common in both speech and writing. You’ll hear both, but avval is the default. For “second” and “third,” the vowel doubles (dovvom, sevvom) because Farsi phonology requires it.

The Formal -omin Variant

In very formal or literary Persian, ordinals get an extra ـین (-in) at the end: یکمین (yekomin), دومین (dovvomin), سومین (sevvomin). This sounds poetic and official. You’ll see it in speeches, book titles, and news. In daily conversation, just use -om.

Notice the word order: -omin goes BEFORE the noun (اولین بار), while -om goes AFTER the noun with ezafe (بار اول). Both are correct, different registers.

Using Ordinals in Sentences

Fractions: nim, nesf, rob’, and Beyond

Farsi fractions mix Persian-origin words with some Arabic borrowings. The everyday ones are simpler than you’d expect.

nim vs. nesf: When to Use Which

Both mean “half,” but they work differently:

• نیم (nim) attaches to nouns directly, like a measurement: نیم ساعت (nim sâ’at, “half an hour”), نیم کیلو (nim kilo, “half a kilo”).
• نصف (nesf) stands alone or takes ezafe to mean “half of something”: نصف پول (nesf-e pul, “half the money”), نصفش (nesfesh, “half of it”).

In spoken Tehrani, people mix them freely, but the pattern holds: nim before a unit of measurement, nesf for “half of [something specific].”

ربع (rob’) is Arabic for “quarter” and shows up mainly in telling time: ربع ساعت (rob’-e sâ’at, “a quarter of an hour”). For more on how Iranians tell time, see Telling Time in Farsi.

Fractions in Daily Speech

The Solar Hijri Calendar: How Iran Counts the Year

This is the part that catches every learner off guard. Iran doesn’t use the Gregorian calendar for daily life. They use the Solar Hijri calendar (تقویم هجری شمسی, taqvim-e hejri-ye shamsi), which starts from the Prophet Muhammad’s migration to Medina but follows the solar year (unlike the lunar Islamic calendar used in Arab countries).

Right now, as I write this, Iran is in the year 1405. The year starts at Nowruz (the spring equinox, around March 20-21 in the Gregorian calendar). The calendar has 12 months, and they don’t line up with January through December at all.

The 12 Months

The first six months have 31 days. The next five have 30. Esfand has 29, or 30 in leap years. Much tidier than the Gregorian calendar’s random alternation.

These month names come from ancient Zoroastrian calendar names. Many are also common first names in Iran. مهر (Mehr) means “love” or “sun.” آذر (Âzar) means “fire.” بهمن (Bahman) means “good mind.” Iranians named after months celebrate the first day of their name-month as a secondary celebration.

How to Say Dates

The date format in Iran is: day / month / year. Iranians say dates as: ordinal number + month name.

In spoken Farsi, people often drop the ordinal suffix and just say the number: پونزده مهر (punzdah-e Mehr) instead of پانزدهم مهر (pânzdahom-e Mehr). Both are understood.

Spoken Shortcuts for Dates

Iranians abbreviate dates constantly in speech:

• Year: Instead of saying هزار و چهارصد و پنج (hezâr o chahârsad o panj, “one thousand four hundred and five”), people say چهارصد و پنج (chahârsad o panj, “four hundred and five”) or even just ۱۴۰۵ digit by digit.
• Birth year: متولد شصت و هشتم (motavalled-e shast o hashtam, “born in ’68”) means 1368, which is 1989 Gregorian. Yes, it’s confusing.
• Today’s date: امروز چندمه؟ (emruz chandome?, “what’s today’s date?”) uses the ordinal -om baked right into the question word.

Converting Between Calendars

The rough math: subtract 621 from the Gregorian year to get the Solar Hijri year (if the date is after March 20). So 2026 Gregorian is roughly 1405 Solar Hijri. For exact conversions, Iranians use apps or websites since the offset shifts by one year depending on whether you’re before or after Nowruz.

Putting It All Together: Real Conversations

If you want to practice building dates and ordinal sentences with instant feedback, ZabanYar has number drills that cover cardinals, ordinals, and calendar dates. The AI tutor catches if you’re using the wrong register or forgetting the ezafe between the ordinal and the noun.

FAQ

Want to master Farsi numbers, dates, and time expressions? ZabanYar has dedicated number drills that cover everything from ordinals to calendar dates, with the AI tutor correcting your pronunciation and register in real time.