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Re: Posix Time Functions [message #17754 is a reply to message #17749]

Thu, 11 November 1999 00:00

Ben Tupper
Messages: 186
Registered: August 1999

Senior Member

In article <382A51B0.44D1CB18@mindspring.com>, Eric says...
>
> I posted this a while a go but didn't hear anything so I thought I'd
> take one more shot. Does anyone know of / have any POSIX time functions
> for IDL? That is a function which takes seconds since Jan, 1 1970 and
> returns a nice date structure (year, month, day,etc..). Such beasties
> are plentiful in Java, C etc so I figure one should be in IDL also.
>
>

Try something like this... I just happened to need something like this recently
when working with instrument data. Each measurement was stamped with Julian
seconds elapsed since October 15, 1582.

FUNCTION POSIX_TIME, Seconds

;convert seconds since 1-1-1970 to a comparable Julian Days elapsed
ElapsedJulianDays = Seconds/(60.*60.*24.)

; get the Julian day number for the benchtime
BenchTimeJulianDay = JulDay(1,1,1970)

; add the number of days elapsed to the BenchTime less one
TargetDayJulian = ElapsedJulianDays + BenchTimeJulianDay - 1.

; convert back to familiar calendar date
CalDat, TargetDayJulian, Month, Day, Year

Return, {Month:Month, Day:Day, Year:Year}

End

Ben Tupper
PemaquidRiver@tidewater.net

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[Message index]

		Re: Posix Time Functions By: Mark Hadfield on Fri, 12 November 1999 00:00
		Re: Posix Time Functions By: Ben Tupper on Thu, 11 November 1999 00:00
		Re: Posix Time Functions By: davidf on Thu, 11 November 1999 00:00
		Re: Posix Time Functions By: Ben Tupper on Thu, 11 November 1999 00:00
		Re: Posix Time Functions By: Liam Gumley on Thu, 11 November 1999 00:00

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