You should use parameters as Mike Y said, but if you want to pass dates as strings you need to use ttoc({your date/time}, 3), in your case:
dt1 = TTOC(DATE(2016,4,1), 3)
dt2 = TTOC(GOMONTH(DATE(2016,4,1),1)-1,3)
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Donald Knuth, repeating C. A. R. Hoare
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