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Re: days of the week [message #29868 is a reply to message #29866]

Wed, 20 March 2002 07:47

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Bastienne Schneiter (b.schneiter@meteonews.ch) writes:

> I need to show a date in a little application. Its format is
> YYYYMMDDHH. But I also have to show to which day of the week this date
> correspond (MON, TUE etc).
> Does anybody know how to determine the day of the week for a given
> date?

Alright. Here is a little function that, given the
julian date, will tell you what day of the week it
is. For example, suppose you want to get married
on November 17, 2002 and the preacher asks you what
day of the week that is. You do this:

"Uh, hold-on...."

IDL> juliandate = Julday(11, 17, 2002)
IDL> Print, WhatDayIsIt(juliandate)
Sunday

"Uh, that's a Sunday, Man."

Cheers,

David

P.S. Sorry for the FOR loop. I was in a hurry. :-(

************************************************************ ************
FUNCTION WhatDayIsIt, juliandate

; Need a date? Duh...

IF N_Elements(juliandate) EQ 0 THEN $
juliandate = Systime(/Julian)

; Make a table. Use week of March 17th, 2002.

daysOfWeek = ['Sunday', 'Monday', 'Tuesday', 'Wednesday', $
'Thursday', 'Friday', 'Saturday']
datemod = IntArr(7)

FOR j=0,6 DO BEGIN
jdate = Julday(3, 17 + j, 2002)
datemod[j] = jdate MOD 7
ENDFOR

; Convert to day, month, year.

CalDat, juliandate, month, day, year
jdate = Julday(month, day, year)

; What day of the week is it? Return it.

index = Where(datemod EQ (jdate MOD 7))
RETURN, daysOfWeek[index]
END
************************************************************ ************

--
David W. Fanning, Ph.D.
Fanning Software Consulting
Phone: 970-221-0438, E-mail: david@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155

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[Message index]

		Re: days of the week By: Craig Markwardt on Thu, 21 March 2002 09:01
		Re: days of the week By: Craig Markwardt on Thu, 21 March 2002 09:01
		Re: days of the week By: Doug Rowland on Thu, 21 March 2002 07:34
		Re: days of the week By: the_cacc on Thu, 21 March 2002 03:21
		Re: days of the week By: Mark Hadfield on Wed, 20 March 2002 14:20
		Re: days of the week By: Mark Hadfield on Wed, 20 March 2002 14:26
		Re: days of the week By: Ed Wright on Wed, 20 March 2002 09:17
		Re: days of the week By: Randall Skelton on Wed, 20 March 2002 09:42
		Re: days of the week By: David Fanning on Wed, 20 March 2002 08:59
		Re: days of the week By: David Fanning on Wed, 20 March 2002 08:49
		Re: days of the week By: eddie haskell on Wed, 20 March 2002 08:25
		Re: days of the week By: Craig Markwardt on Wed, 20 March 2002 08:26
		Re: days of the week By: David Fanning on Wed, 20 March 2002 07:47
		Re: days of the week By: David Fanning on Wed, 20 March 2002 07:12
		Re: days of the week By: Martin Downing on Mon, 25 March 2002 09:07

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