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Full Discussion: Change Date from dd-mmm-yyyy to mm/dd/yyyy
Top Forums Shell Programming and Scripting Change Date from dd-mmm-yyyy to mm/dd/yyyy Post 302179904 by era on Saturday 29th of March 2008 03:09:47 AM
Old 03-29-2008
Not all date implementations have all this fancy shmancy stuff. As a matter of fact, on HP-UX or Sun, you should be thankful that it even displays today's date.

If you can't get a good date (sorry, couldn't resist), then yes, sed (or cut, or awk, or perl, or nearly any programming language you happen to know the basics of) can be used to move around parts within the string.

(True story from real life: I had a colleague who needed to remove duplicate lines from a file. I intercepted him when he had exported the file to his University account and loaded it into SPSS which he was more familiar with, but couldn't quite get to do this precise task.)

But yes, you need the month name to number mapping somehow. somebody posted one awk solution the other day, but I can't seem to find it now. If the input is just the date then twelve lines of sed will do it.
 

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LEARN ABOUT PLAN9

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 02:01 PM.
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