Bill,

I would suggest that you use TTOC(,1) which is unaffected by numerous date/time settings.

lc = SYS(2007,TTOC(tt-60,1))

>>Can you post code for Checksum function?
>>
>>>When I run Checksum(myDateTime) in developement I get a different value than during runtime.
>>>I have set seconds, set hours, set date and set century set the same in Runtime and Developement.
>>>What else am I missing?
>>>
>>>TIA
>
>Hi Sergey,
>Here's the method() I use to calculate checksum
>

>method myCheckSum()
>  LPARAMETERS tt
>
>  IF VARTYPE(tt) # 'T'
>    tt = {}
>  ENDIF
>
>  LOCAL lc
>  lc = SYS(2007,TRANSFORM(tt-60))
>  RETURN lc
>
>method mySetTime()
>  lt = datetime()
>  lc = this.myCheckSum(lt)
>  replace myDateTime with lt, dt_check with lc
>
>method myValidate_Time()
>  return this.myCheckSum(myDateTime) # dt_check
>

>for ctot("06/29/2003 11:01:39 PM")
>Runtime version returns 46007
>Development version returns 37964
>
>If I run myValidate_Time() from the same version (Runtime or Development) that mySetTime() was run it returns .t., but if I run them from different versions it returns .f.