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Re: HELP with systime() [message #10887 is a reply to message #10877]

Wed, 11 February 1998 00:00

Brian Jackel
Messages: 34
Registered: January 1998

Member

Mark Elliott asked:

> Is there a way to convert a binary time value like the one
> returned by
>
> timeval = systime(1)
>
> into a date string like
>
> DOW MON DD HH:MM:SS YEAR ?
>
> I've found bin_date() but it accepts only the ascii_time format
> for input. I'd like to convert the number of seconds since 1/1/1970
> into the month,day,year,... that it corresponds to.
>

A couple years ago I wrote some code to do what you're asking
about. However, I recently discovered an easier way of doing
things, using the CDF_EPOCH function, which is part of the
Common Data Format library included with IDL. It can do two
things

1) Given a year,month,day etc. return the time in milliseconds
since a reference time (0 AD). Use this to find out when
the standard Unix reference time started:

CDF_EPOCH,UnixEpoch,1970,1,1,0,0,0,/COMPUTE_EPOCH

2) Turn a reference time back into year, month, day etc.
Add the number of milliseconds given by SYSTIME to
the Unix reference time

CurrentEpoch= UnixEpoch + SYSTIME(1) * 1000.0d0

Then recover the information you want

CDF_EPOCH,CurrentEpoch,year,month,day,hour,minute,second, $
/BREAKDOWN_EPOCH

which you can format as needed. Hope this helps. Oh,
there's one little problem. The CDF stuff works in
Universal Time, while SYSTIME tends to correct for the
current time zone. Be careful...

Brian Jackel

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[Message index]

		Re: HELP with systime() By: safier on Wed, 11 February 1998 00:00
		Re: HELP with systime() By: thompson on Wed, 11 February 1998 00:00
		Re: HELP with systime() By: Liam Gumley on Wed, 11 February 1998 00:00
		Re: HELP with systime() By: Brian Jackel on Wed, 11 February 1998 00:00
		Re: HELP with systime() By: davidf on Wed, 11 February 1998 00:00

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