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+--- Thread: converting between calendar dates and Julian days (/thread-19297.html)
converting between calendar dates and Julian days - cdeaglejr - 12-14-2022 05:23 PM
This HP PPL program can be used to convert between calendar dates and Julian days. With this software a UTC calendar date and time can be converted to the corresponding Julian days on the UTC (universal coordinated time; subroutine julian) , TDB (barycentric dynamical time; subroutine utc2tdb) and TDT (terrestrial dynamical time; subroutine utc2tdt) time systems. A TDB Julian day can be converted to a UTC calendar date and time using the tdb2utc subroutine.
The software and brief documentation for this program can be downloaded from
https://www.dropbox.com/s/khanxo2yu9elulo/demo_dates.zip?dl=0
RE: converting between calendar dates and Julian days - cdeaglejr - 02-18-2023 10:10 AM
Updated February 18, 2023
Bug fix. Variable jdsaved needs to be global.
RE: converting between calendar dates and Julian days - mchris - 03-30-2023 05:26 PM
julian to date function
DATEADD(1582.1015,J-2299161)
Parameters: J (julian date number)
date to julian function
DDAYS(1582.1015,D)+2299161
Parameters: D (Date)
Date format: YYYY.MMDD