Checking for valid date input and convert appropriately

[Ferrous Cranus]

Τη Παρασκευή, 22 Φεβρουαρίου 2013 12:03:59 π.μ. UTC+2, ο χρήστης Michael Ross έγραψε:
> On Thu, 21 Feb 2013 22:22:15 +0100, Ferrous Cranus <nikos.gr33k at gmail.com>  
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> wrote:
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> > Τη Πέμπτη, 21 Φεβρουαρίου 2013 10:14:13 μ.μ. UTC+2, ο χρήστης MRAB  
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> > έγραψε:
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> >> On 2013-02-21 19:38, Ferrous Cranus wrote:
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> >>
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> >> > import datetime from datetime
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> >> Should be:
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> >> from datetime import datetime
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> >> >
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> >> > try:
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> >> >      datetime.strptime( date, '%d %m %Y' )
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> >> That parses the date and discards the result.
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> >> >      date = date.strptime( '%Y-%m-%d' )
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> >> 'date' is a string, it doesn't have a 'strptime' method.
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> >> When you parsed the date you got a datetime object; _that_ has the
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> >> 'strptime' method.
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> >
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> > I don't need to store the date i just want to make sure is entered  
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> > correctly.
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> > I would like to have the user type the date like
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> >
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> > 21 02 2013
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> > and then convert it to 2013-02-21 because thats how mysql wants the date  
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> > in order to store it.
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> > Please show me how to write this.
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> >
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> > Also, can you show me how to write it that if so even if the user  
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> > entered date is wrong it doesn't just crash the cgi-script?i know i can  
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> > use tr: expect: but i want to avoid it, somehow i need to check the date  
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> > in the same if statemnt like i do with the other user defined varibles  
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> > for validity.
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> >
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> You *have* to try/expect in order to not have the script crash.
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> Think user typo: 21 02 2ß13
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> Personally, I'd use a javascript on the html so users can't POST invalid  
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> dates.
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> I use mootools for that. It accepts 21/02/2013, 21-02-2013 and 21.02.13 as  
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> input,
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> and you end up with 21.02.2013 posted to your cgi in any case.

i just want to check for date validity from within ha same if statemnt like i check the other variables and i tried a regualr expression just now:

if( task and ( price and price.isdigit() and price.__len__() <= 3 ) and ( date and re.search( r'(\d+) (\d+) (\d+)', date ) ) ):

Do i ahve somehting wrong in it?

will the if become true if the user enters 21 02 2013 ?