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Julian Date Searches

Google uses the Julian date system as the timestamp used on daterange searches. The Julian date system, often abbreviated to JD, is a count of all the days (and factions of days) since January 1, 4713 BCE. The calendar system we used today, the Gregorian calendar, was adopted at different times by different countries. For example, the United Kingdom changed from the Julian to the Gregorian calendar in September 1752. The Gregorian calendar was introduced by Pope Gregory XIII in October of 1582.

Use the calculator below to calculate the equivilient Julian date. Google uses the Julian Date measure as a timestamp in the daterange search function. This Julian date calculator uses the PHP GregorianToJD() function.

Calculate Julian Date
Year Month Day


Use this function to calculate the Gregorian date from a Julian date. This calculator uses PHP's JDToGregorian() function but the output is modified to use the British style of date (day/month/year).

Calculate Gregorian Date
Julian Date