Calculating days between dates

I am using the following code in B4i: (using DateUtils)

Dim diff As Period
DateTime.DateFormat="dd.MM.yyyy HH:mm:ss"
diff = DateUtils.PeriodBetweenInDays(DateTime.Now, DateTime.DateParse("27.07.2016 23:59:59"))
Label1.Text = diff.Days

Why does this code not work in B4A?

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