Berkeley CSUA MOTD:Entry 15650
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2025/07/12 [General] UID:1000 Activity:popular
7/12    

1999/3/29-30 [Computer/Theory, Computer/SW/OS/Windows] UID:15650 Activity:high
3/29    Algorithm question:  Is an easy way to figure out the number of
        days between two given dates?  Eg. given 98/11/05 and 98/12/09
        as input, the output would be 34 days?  Is there a C function
        that can xlate the date into some absolute number and then do the
        arithmetic and then covert it back?  Thanks!
        \_ Let me guess. You're trying to implement If-Modified-Since for
           ee 122 right?  What I've used since my early days of programming
           is time_t time(time_t *t); or 'man 2 time' at the unix prompt.
           It'll return the number of seconds since Jan 1, 1970. --jeff
        \_ Convert both to Julian dates and subtract.
           \_ http://wwwmacho.mcmaster.ca/JAVA/JD.html  guess you'll have
              to figure out the algorithm from the JavaScript fcns
              \_ Or just use mktime(3) and subtract.
2025/07/12 [General] UID:1000 Activity:popular
7/12    

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Cache (246 bytes)
wwwmacho.mcmaster.ca/JAVA/JD.html
Calendar Date to Julian Date Calculator The algorithm used is from "Astronomical Formulae for Calculators" (2nd edition) by Jean Meeus ISBN 0-943396-01-8 . Enter the UT date and time in the appropriate fields and then press the Compute JD button.