Julian Date Converter

Julian dates (JD) serve as a continuous time system commonly employed in astronomy and related sciences to conveniently represent date and time as a single real number. Originating from Julian Day Number, the Julian date starts from noon Universal Time (UT) on January 1, 4713 BCE, as established in the Julian calendar. The system is particularly useful for simplifying the calculation of time intervals between different events and for integrating time-related data from diverse sources. 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.