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Re: DAY OF YEAR [message #17459 is a reply to message #17452]

Mon, 25 October 1999 00:00

thompson
Messages: 584
Registered: August 1991

Senior Member

Ben Tupper <tupper@seadas.bigelow.org> writes:

> Howdy,

> Haje Korth wrote:

>> Hi folks,
>> Sometimes RSI is driving me nuts with introducing new stuff and making
>> old stuff obsolete.
>> Can anybody tell me with their new date/time format code, how to print
>> the day of the year (doy). It should be something like:
>> a=julday(month,day,year,hour,min,sec)
>> print,a,format='(c(???????))'
>>

> You could calculate the DOY with the following.

> IDL> Today = JulDay(10,26,1999)
> IDL> BenchMark = JulDay(1,1,1999)
> IDL> print,Today-BenchMark
> 298

> Note that this DOY implies that Jan 1 is D0Y 0... which is ok for somefolks but
> not others. I can't think of the need for it, but sometimes the first DOY is
> considered DOY 1. (Just when I was getting used to counting from Zero and
> having only nine fingers!)

The *OFFICIAL* (:^]) definition of day-of-year, as used by NASA and as outlined
in the ISO-8601 standard, begins with January 1st as DOY=001.

Bill Thompson

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[Message index]

		Re: DAY OF YEAR By: Ben Tupper on Tue, 26 October 1999 00:00
		Re: DAY OF YEAR By: thompson on Mon, 25 October 1999 00:00
		Re: DAY OF YEAR By: Ben Tupper on Mon, 25 October 1999 00:00

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