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DateDelta
A single continuously increasing day count, sidestepping months, leap years, and calendar quirks entirely.
Calculating the number of days between two calendar dates requires handling varying month lengths and leap years. Julian Day Numbers are just one continuously incrementing integer, making elapsed-time math between any two dates a simple subtraction.
Despite the similar name, Julian Day Number isn't about the old Julian calendar (which the Gregorian calendar replaced) — it's a separate day-counting system, named after Joseph Scaliger's father Julius, still used today in astronomy and some scientific computing.
Duration between two times of day, in hours and minutes.
OpenHours worked from clock-in, clock-out, and break time.
OpenWeekly total hours and overtime from daily entries.
OpenAnnual cost of your daily commute.
OpenJulian Day Number
2,461,244
JDN counts consecutive days since noon UTC, January 1, 4713 BC.
What you entered
Apply the Gregorian-to-Julian Day Number algorithm
f(2026, 7, 22)= 2,461,244Result
Julian Day Number: 2,461,244
2026-7-22 corresponds to Julian Day Number 2461244 — used in astronomy to sidestep calendar irregularities like leap years and varying month lengths.