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Notes on time, calendars, and dates — how the Persian (Jalali / Shamsi) and Gregorian (Miladi) systems work, where they disagree, and how to convert between them with confidence.
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How many days until Nowruz 2027?
Nowruz 2027 falls on Sunday, 21 March 2027. Here is the exact countdown, why the date lands on the 21st this year, and a live timer that ticks down.
How to calculate the number of days between two dates
Count the days between two dates by hand or with a calculator. The method, a worked example, the leap-year gotcha, and a live tool that does it instantly.
Why Nowruz isn't always on the same Gregorian day
Nowruz tracks the spring equinox, so on the Gregorian calendar it lands on 20 or 21 March depending on the year. Here is why the date drifts, with a table.
Persian (Jalali) leap years, explained
How leap years work in the Persian (Jalali / Solar Hijri) calendar, why the extra day is 30 Esfand, and the 33-year cycle behind the rule.