Cast String as an Integer

[ken gray]

What am I overlooking here?  I'm wanting to do a date difference but can't remember/figure out how to cast string as int.
How can I do this?

Macro Macro5

Code:

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int spanDays
_s.timeformat("{yMMdd}")
_i=_s
TimeSpanGetParts sub.DateIntToDateTime(_i)-sub.DateIntToDateTime(210405) spanDays
out spanDays
end

#sub DateIntToDateTime
function'DateTime dateInt

;dateInt - date in decimal format, like 160103 (2016-01-03)

;note: year must be 2-digit, assuming that the actual year is 2000-2099.


DateTime r.FromParts(dateInt/10000%100+2000 dateInt/100%100 dateInt%100)
ret r