When is Nowruz in your timezone?

If you’ve seen Nowruz listed at different times for Tehran, London, Toronto, and Los Angeles, that’s not an error. Nowruz is a single moment in time, and a single moment reads differently on every clock.

The countdown below resolves the moment for you, wherever you’re viewing from:

One moment, many clocks

The vernal equinox is an astronomical event: the instant the Sun crosses the celestial equator. It occurs at the same physical moment for everyone on Earth (source: timeanddate.com, March equinox). But because clocks are offset by timezone, that one instant is, say, early evening in Tehran, mid-afternoon in London, and morning in North America. For example, an equinox at 21:30 in Tehran (UTC+3:30) is 18:00 UTC the same day, but 13:00 in New York and already past midnight into the next day in parts of the Pacific.

The Persian calendar officially fixes Nowruz to the day containing that instant at the reference meridian for Iran Standard Time. So the calendar date of Nowruz is defined by Iran’s clock, even though the underlying moment is global.

Why your local day can differ

Here’s the consequence people notice: if the equinox falls late in the day Iran time, it can already be the next calendar day in countries to the east, or still the previous day to the west. So a diaspora community in, for example, the Americas might experience the equinox moment on what is, for them, the evening before Iran’s Nowruz date.

This is the same timezone effect that makes date conversion tricky in general, a single instant near midnight lands on different calendar days in different zones. It’s why careful date tools separate the calendar date from the clock time.

Finding the exact local time

To know precisely when Nowruz occurs where you are:

1. Take the equinox instant for the year (the countdown above tracks the next one).
2. Read it in your local timezone.

For the calendar date specifically, in Iran’s definition, see Nowruz 2027, which has the date and a live countdown. For the background on why the date itself moves between 20 and 21 March, see why Nowruz isn’t always on the same Gregorian day.

The bigger lesson for dates

The Nowruz-by-timezone quirk is a vivid example of why mixing time zones into date handling causes bugs. When you only care about the calendar date, work date-only and keep clock time out of it. That’s how the converter is built, so converting a date near midnight never slips a day.

So Nowruz is one moment seen on many clocks. The Nowruz 2027 post lists that moment in seven cities, and you can convert any date without timezone surprises.