The suggestion below actually worked -  except I changed it to this: 

DATEADD("day",-10,$My Date$)

William Rentfrow
Principal Consultant, StrataCom Inc.
wrentf...@stratacominc.com
Blog: www.williamrentfrow.com
O 715-592-5185
C 715-410-8056

-----Original Message-----
From: Action Request System discussion list(ARSList) 
[mailto:arsl...@arslist.org] On Behalf Of Charles Baldi
Sent: Tuesday, March 02, 2010 11:14 AM
To: arslist@ARSLIST.ORG
Subject: Re: Weird DST date calculation issue

William,
If you use the dateadd() function do you get a different result?  E.g.,

dateadd("month", -10, date($My Date$))

Regards,
Chuck Baldi

On Tue, Mar 2, 2010 at 12:02 PM, William Rentfrow <wrentf...@stratacominc.com> 
wrote:
> **
>
> Fortunately this issue SHOULD be very straight forward.
>
> Unfortunately - it isn't.
>
> There's a button that calculates a person's period of eligibility to 
> make changes to their HR benefits, etc.  You enter their employment 
> anniversary date and hit the button and this performs a calculation:
>
> $My Date$ - 864000 (i.e., minus 10 days).
>
> Here's the interesting thing - when the date entered is  Daylight 
> savings time - 3/15 this spring - the calculated value for the date 
> time field returns 3/4/2010 11:00:00 PM.  Normally all of the times in 
> this date/time field are left at 12:00:00 AM and are unused.
>
> Technically speaking the calculation is EXACTLY correct.  3/4/2010 
> 11:00:00 PM is exactly 10 days before 3/15/2010 12:00:00 AM - because 
> 3/15 has an "extra" hour added that is a figment of our collective 
> imagination.
> Technically DST doesn't happen until 2:00 AM though but that's a 
> matter for another time.
>
> I was thinking about changing the times on these to default to 3:00:00 
> AM instead of 12:00:00 AM - but I'm open to suggestions.
>
> William Rentfrow
> Principal Consultant, StrataCom Inc.
> wrentf...@stratacominc.com
> Blog: www.williamrentfrow.com
> O 715-592-5185
> C 715-410-8056
>
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