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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.
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).
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. UTC Date. Enter in any format (e.g. 1/1/1900, today) OR. Julian Date. Enter the Julian Date to convert to UTC.
Use this tool to convert between date and Julian (yyddd) date formats. Enter a valid date or Julian date, and click 'Convert'. To see an example, click 'Show Example'. Enter dates in the form mm/dd/yy, dd-mmm-yyyy, 'today', '+1 day' or similar. Enter Julian dates in the format yyddd, yy-ddd or yy.ddd.
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...
Convert from calendar date and time to Julian date, and vice versa. Enter either a Calendar date, or a Julian date and click Calculate. This calculator is a modified version from the U.S. Naval Observatory.
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.
CalendarLabs makes determining the Julian and Gregorian dates for today or any date a breeze. Here is how you can do it. Enter the Gregorian date, hours, and minutes and click ‘Calculate,’ the tool will generate the corresponding Julian date in many formats, including the modified Julian date.
The calculator below transforms the date from the Gregorian calendar to Julian and vice versa. It's easy to use - enter the date, and it will show Julian and Gregorian calendar dates. Also, there was no Gregorian before 15th October 1582, so you can't tell the date before.