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isNumber vs isDate
Posted: Mon Oct 08, 2012 7:01 pm
by lohill
I can use isNumber to determine if an input field has had a number entered but I'm not sure how to tell if what was just entered is a legitimate date. There does not appear to be an isDate function that returns true or false like isNumber. I have tried converting the input to dateItems and looking at that result but even a plain number will cause dateitems to give a date. Do you have a suggestion for looking at the input on closeField to tell whether the input is really a date.
Thanks,
Larry
Re: isNumber vs isDate
Posted: Mon Oct 08, 2012 7:10 pm
by Klaus
Hi Larry,
you CAN in fact do this:
...
answer ("10/8/12" is a date)
## -> true
...
Although there is no function "isDate".
Best
Klaus
Re: isNumber vs isDate
Posted: Mon Oct 08, 2012 7:28 pm
by mwieder
Klaus-
The problem isn't with determining what is a date, but what isn't a date.
put 1234 is a date
==> true
the date functions are so flexible and forgiving of user inputs that it's harder for something to fail date verification.
Re: isNumber vs isDate
Posted: Mon Oct 08, 2012 9:06 pm
by Klaus
Hi Mark,
yes, you are right, always forget this :-/
Re: isNumber vs isDate
Posted: Mon Oct 08, 2012 9:42 pm
by Mark
Hi,
I believe the isNumber and isDate are SuperCard syntax.
If a string is a number, then it is probably not date, but it could be seconds or milliseconds.
Code: Select all
put ("10/10/10" is not a number) and ("10/10/10" is a date)
--> true
put ("123456" is not a number) and ("123456" is a date)
--> false
put ("abcdefgh" is not a number) and ("abcdefgh" is a date)
--> false
The following is slightly problematic:
put ("10/10" is not a number) and ("10/10" is a date)
--> true
You might want to check that the date consists of 3 items in the last case.
Kind regards,
Mark
Re: isNumber vs isDate
Posted: Tue Oct 09, 2012 1:30 am
by dunbarx
This goes way, way back. It can be managed easily, but talk about too flexible. You always have to remember to make sure that what you WANT to be a date is the only form that is allowed.
Craig