Julian Day Number (JDN) calculations

Day counting (numbering) is a useful method to add and subtract dates, and for data storage of dates. Day counters can easily be changed to counters of seconds or other units.

Input type:
Input value:

Output result:

Gregorian Date -
Julian Date -
eXtended Day Number (XDN) -
Julian Day Number (JDN) -
Rationalized Day Number (RDN) -
Modified Julian Day (MJD) -
Day of Week -
Gregorian Day of Year -
Gregorian Week of Year -
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