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Full Discussion: Changing AIX system date
Operating Systems AIX Changing AIX system date Post 302401243 by wfavorite on Friday 5th of March 2010 09:08:12 AM
Old 03-05-2010
The date command can be supplanted with your own time command, but the (signed) 32 bit seconds since epoch will still roll sometime in the 2030's.

So any application that asks the kernel for seconds since epoch (using the *standard* functions) will break using a date like 2050.

The difference here, is that one method is a binary the other is an API.

On the other hand, both java and Oracle can handle dates *much* greater or less than the Unix system time. Java uses its own Olsen DB, and can calculate dates accurately for centuries even covering historical time shifts to fix inaccuracies in medieval calendars.

So if you wanted to see how your app will run in 2050, you may have some problems with current Unix implementations of time(). If you want to calculate amatorizations (as an example) to the year 2050, this should be no issue (and not require a call to time()).
Last edited by wfavorite; 03-05-2010 at 10:17 AM.. Reason: clarification
 

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LEARN ABOUT DEBIAN

getdate

GETDATE(1)							   User Commands							GETDATE(1)

NAME

       getdate - AME

SYNOPSIS

       [-dv][-n dec][-f format] [ra dec sys] itype2otype [date and/or time]

DESCRIPTION

       Convert date and time between various formats

	      [-dv][-n dec][-f format] itype2otype @file

	      itype: nfd=ISOFITS fd=FITS, dt=yyyy.mmdd, hr=hh:mm:ss, deg=dd:mm:ss

	      jd=Julian  Date,	mjd=Modified Julian Date hjd=Heliocentric Julian Date, mhjd=Modified HJD ep=epoch, epj=Julian epoch, epb=Besselian
	      epoch lt=local time, ut=UT, ts=seconds since 1950-01-01 now=current time, ang=fractional degrees

	      otype: fd=FITS, dt=yyyy.mmdd, jd=Julian Date, mjd=Modified Julian Date

	      hjd=Heliocentric Julian Date, mhjd=Modified HJD  hr=hh:mm:ss,  deg=dd:mm:ss,  ang=fractional  degrees  ep=epoch,	epj=Julian  epoch,
	      epb=Besselian epoch ts=seconds since 1950-01-01, tsu=Unix sec, tsi=IRAF sec gst=Greenwich Sidereal Time, lst=Local Sidereal Time

	      @file: First one or two columns are in itype format ra dec sys:  Need for Heliocentric conversions

       -a: Append date to input file, if there is one

       -d: Print date without time

       -e: Print output as ET/TDT/TT converting from UT

       -f: Format for output number (C printf)

       -h hours: Longitude in hours, west positive

       -l degrees: Longitude in degrees, west positive

       -n: Number of decimal places in sec, epoch, JD

       -t: Print time without date

       -v: Verbose

getdate 3.8.4							     June 2012								GETDATE(1)
All times are GMT -4. The time now is 06:06 PM.
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