need to convert time to minutes in userform

time will be entered in the text boxes as (txtstart1) 11:00 (txtend1) 14:00

txtmin1 should then equal 180

ah yes, the parenthesis in the calculation. I havent got that far, I get an error telling me that 11:00 makes a lousy integer.

Heres the actual error I get when I run it

Run-time error '13':

and when I debug, this is highlighted

endnum1 = txtend1.Value