why are dates wrong?

[Denise Vella]

Hello

Here's my data

Why are certain dates appearing as missing, when it's the correct code I'm using

gen OpDate=date(opdate, "DMY")
format OpDate %td
drop opdate

* Example generated by -dataex-. For more info, type help dataex
clear
input str14 opdate float OpDate
" 3/11/2008" 17839
" 2/19/2009"     .
"  7/1/2009" 17904
"10/25/2007"     .
"10/14/2008"     .
" 6/16/2009"     .
"12/11/2007" 17482
end

[Nick Cox]

Your dates are MDY not DMY.