# [no subject]

```When I compare myDate with the original string I find a one-to-one
correspondance such that the myDate shows the same date as do the original
string (i.e., when the original string is 12/31/1974, the myDate %td format
is 31dec1974). However when I instead format myDate as %tw I find a
completely different result. E.g., the example 12/31/1974 then becomes
2065w19. . . Something must be very wrong and I appreciate any suggestion to
solve this riddle.

The code is as below.

capture drop myDay myMonth myYear

generate myYear = substr(dates,7,10)
replace myYear = substr(dates,5,4) if length(dates)==8
replace myYear = substr(dates,6,4) if length(dates)==9

generate firstSlash = strpos(dates,"/")

generate myMonth = substr(dates,1,2) if length(dates) == 10
replace myMonth = substr(dates,1,2) if firstSlash == 3
replace myMonth = substr(dates,1,1) if firstSlash == 2

generate myDay = substr(dates,4,2) if length(dates) == 10
replace myDay = substr(dates,4,1) if length(dates) == 9 & firstSlash == 3
replace myDay = substr(dates,3,2) if length(dates) == 9 & firstSlash == 2
replace myDay = substr(dates,3,1) if length(dates) == 8 & firstSlash == 2

destring myMonth, replace
destring myYear, replace
destring myDay, replace

generate myDate = mdy(myMonth, myDay, myYear)

format myDate %td

capture drop firstSlash

Regards
Joachim
___________________________________________
Joachim Landstrom
Assistant Professor
Uppsala University, Sweden

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