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Hi! how do i know if the input is the same as the required date format? the date should be dd/mm/YYYY ex. 2/3/2012 or 15/11/2012

all the following conditions must return an error:
*input of...

how do you write an if statement for something like
if ((expr 1 >= expr 2 && expr 3 >= expr 4) && expr 5 <= expr 6)

if ((TRUE && TRUE) && TRUE) then
condition...

i've done it this way...

I have a data in a file called SCHED which has 5 columns: sched no, date, time, place and remarks. The image is shown below.
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