UTC Date trouble

[Dubya007]

I need to have a vbscript run every hour. This script need to dynamically get the previous UTC hour.
Example If it runs at 9 AM Est I need it to return: 8amUTC and 9am UTC.

I can create the timestamps well enough but when I try to use them I don't think that the system is looking at them as valid date formats. If I hardcode the values into the script it will work. So I must be creating these incorrectly. Does anyone have a better solution than how I am doing this?

od = now() 
set oShell = CreateObject("WScript.Shell") 
atb = "HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\TimeZoneInformation\ActiveTimeBias" 
offsetMin = oShell.RegRead(atb) 
nd = dateadd("n", offsetMin, od)

StartTime = Year(Date)&"-" & Month(Date)&"-"&Day(Date)&"T"&(Hour(nd)-1)&":00:00Z"
EndTime = Year(Date)&"-" & Month(Date)&"-"&Day(Date)&"T"&Hour(nd)&":00:00Z"

'StartTime ="2010-11-01T19:00:00.00Z"
'EndTime="2010-11-01T20:00:00.00Z"

wscript.echo StartDate
wscript.echo EndDate

[akhileshbc]

Maybe using DateSerial function or CDate function to convert the dates, will help