# 3864 Compiler Not Allowing Subtraction of Integers from DateTime Values

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The help says "Date/time types are actually just 32-bit integers, so they can be manipulated just like the Integer type."

This does not appear to be consistent. I am trying to get yesterday's date, using the following code, but I get an error
"Expected integer or float but insteadl found tmToday".

If I make that a + instead, it compiles without problem.