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January 2001, Week 5

HP3000-L@RAVEN.UTC.EDU

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Subject:
From:
"Coombs, Darryl" <[log in to unmask]>
Reply To:
Coombs, Darryl
Date:
Wed, 31 Jan 2001 14:55:39 -0400
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When I was in the Reserves (Canadian) the Julian date that we used was the
last digit of the year and three digits for the day of the year, so today
would be 1031.

Darryl

-----Original Message-----
From: Johnson, Tracy [mailto:[log in to unmask]]
Sent: Wednesday, January 31, 2001 2:54 PM
To: [log in to unmask]
Subject: Re: date controversy


Another definition of the usage of Julian Date
is simply the number of the day from the start
of the current year.  As issued by the U.S.
Government on their two-sided Julian Date
Calendars.  One side of the calendar is a
regular year, the reverse side is a leap-year.

According to my U.S. Government Julian date
calendar, today is '031'.

Tracy Johnson
MSI Schaevitz Sensors


-----Original Message-----
From: Wirt Atmar [mailto:[log in to unmask]]
Sent: Wednesday, January 31, 2001 12:36 PM
To: [log in to unmask]
Subject: Re: date controversy


Paul writes:

> today someone asked me what the Julian date was for today; I replied
01031,
> with
>  tomorrow
>  being 01032, etc.   Another person said that's not what a Julian date is
at
> all,
>  and upon looking it
>  up on a web site - one site says it is 2451941 another site defined
Julian
> date
>  as the number
>  of days since Jan 1, 4713 BC and that today is 1757966.

For more than you ever wanted to know about Julian Dates, see:

     http://tycho.usno.navy.mil/mjd.html

However, it is worth noting that a Julian Date calendar (which only counts
days, not weeks, months, or years), can start from any arbitrary starting
date. In that regard, many of the major software vendors (Microsoft, AICS
Research, etc.) start their calendars at midnight, Dec 31 1899, so that Jan
1
1900 is day 1 of the calendar.

Wirt Atmar

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