For such value, u need a Cut OFF date, from onwards, you can calculate the miiseconds till the required date, for example,

FirstDate = getdate() - 1

Seconddate = getdate()

Now, you can calculate teh milliseconds based on the difference of two dates as,

lets say, if the difference is 1, then 24 hours = 24*60 Minutes = 24*60*60 seconds = 24*60*60*1000 milliseconds

Atif Sheikh