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Re: JULDAY 5.4 not same as 5.3? [message #23977]

Fri, 02 March 2001 08:52

Chris Torrence
Messages: 5
Registered: March 2001

Junior Member

Hi Don,

The problem is with using an unsigned long integer. Inside JULDAY.PRO,
it subtracts 12 off of the hours before dividing by 24. This will cause
wrap-around for unsigned longs and unsigned long64s.

So you should be able to fix (no pun!) your problem by:

in_jday = julday( umm, udd, uyear, FIX(uhr), umin, usec )

This bug has been logged with RSI, and will be fixed in the next IDL
version.

Cheers,
Chris Torrence
Research Systems, Inc.

Don Woodraska wrote:
>
> Has anyone else noticed a bug in JULDAY that appeared in 5.4?
>
> I tried this in IDL 5.3:
>
> IDL> help,umm,udd,uyear,uhr,umin,usec
> UMM LONG = 2
> UDD LONG = 16
> UYEAR LONG = 2001
> UHR ULONG = 0
> UMIN ULONG = 0
> USEC ULONG = 0
> IDL> in_jday = julday( umm, udd, uyear, uhr, umin, usec )
> IDL> gps0_jday = julday(1,6,1980,0,0,0)
>
...
> IDL> in_jday = julday( umm, udd, uyear, uhr, umin, usec )
> IDL> gps0_jday = julday(1,6,1980,0,0,0)
> IDL> help,in_jday,gps0_jday
> IN_JDAY DOUBLE = 1.8140893e+08
> GPS0_JDAY DOUBLE = 2444244.5
>

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[Message index]

		Re: JULDAY 5.4 not same as 5.3? By: Chris Torrence on Fri, 02 March 2001 08:52
		Re: JULDAY 5.4 not same as 5.3? By: Don Woodraska on Fri, 02 March 2001 08:49
		Re: JULDAY 5.4 not same as 5.3? By: pertti on Fri, 02 March 2001 02:29
		Re: JULDAY 5.4 not same as 5.3? By: Don Woodraska on Thu, 01 March 2001 16:28
		Re: JULDAY 5.4 not same as 5.3? By: Mark Hadfield on Thu, 01 March 2001 15:19
		Re: JULDAY 5.4 not same as 5.3? By: Don Woodraska on Fri, 02 March 2001 10:39

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