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Id: 102747
Status: resolved
Priority: 0/
Queue: Date-Manip
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Owner: Nobody in particular
Requestors: EDAVIS [...] cpan.org
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  Fri Mar 13 13:25:27 2015 EDAVIS [...] cpan.org - Ticket created
Subject: + -2 hours
Arithmetic in Perl (and other languages) allows a unary minus, e.g. % perl -E 'say 10 + -2' 8 However this isn't accepted by DateCalc: % perl -MDate::Manip -E 'say DateCalc("now", "+ -2 hours")' It should allow unary + and - on the right hand side of the binary + or - operator. This would be particularly useful when generating the calculation: DateCalc($d, "+ $h hours") where $h might be positive or negative. I understand that it works to omit the leading +, but I suggest the explicit + is a bit clearer, and if it can be given some of the time it should work all of the time.
  Fri Mar 13 13:45:30 2015 sbeck [...] cpan.org - Correspondence added
I think I'm not yet convinced that your argument applies. If I were overloading operators, then I agree that something like this should be valid: $date1 = ... $delta = ... $date2 = $date1 + -$delta; However, that's not the format here. Let's say you wanted to implement the '+' operator as a function. Would you allow the following? $result = add(10,'+ -2'); Although it's easy to understand what you mean, I don't think that you would choose to do so. In this context, both arguments should be valid numbers, and I don't believe that '+ -2' is a valid number any more than '+ -2 hours' is a valid delta.
  Fri Mar 13 13:45:31 2015 The RT System itself - Status changed from 'new' to 'open'
  Fri Mar 13 13:45:31 2015 sbeck [...] cpan.org - Status changed from 'open' to 'resolved'