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Day-of-Year (JDay) The calculator is bi-directional*. Make Calendar. Select Month / Day / Year and press the "Show_Calendar" button. The Calendar will be displayed in Regular and/or Julian Date Format. Compute JDay from Month / Day / Year*.
Astronomers and scientific software use the Julian date today to calculate the number of days between two important events. Many orthodox Christian churches also follow the Julian calendar to celebrate religious days.
JD Date/Time Converter. Use this tool to convert a specified calendar date/time to an equivalent Julian Day (JD) number. Enter a date as year - month - day (e.g., 2000-01-01) with an optional time separated from the date with either a space or underbar _ (e.g., 2000-01-01 12:00).
Change civil date to calculate Julian Day Number and day-of-week, or vice versa. After changing a text box, click outside of the calculator, or press tab, to update all other data. (Don't press return.) In Auto mode, civil calendar changes from Julian to Gregorian between October 5/16, 1582.
Julian dates (abbreviated JD) are simply a continuous count of days and fractions since noon Universal Time on January 1, 4713 BC (on the Julian calendar). Almost 2.5 million days have...
This tool converts between UTC (Coordinated Universal Time) and Julian dates. You may download a reference calendar (pdf) from here: https://aavso.org/jd-calendar.
Julian days calculation. Calculation of the Julian day for a given date, plus some information. Astronomers often need to know the difference between two dates, or to be able to calculate the next date of a periodic event.