Rails: use Date.strptime to parse date
It is very common to parse dates from strings. It seems obvious to use
Date.parse for this job. However this method does not validate the input and tries to guess the format of the string.
This can lead to a very unexpected results:
> Date.parse('Foobar_09_2018') Tue, 09 Oct 2018
In most of the cases it would be better to use
Date.strptime as you can provide a date or time pattern to match against.
> Date.strptime('Foobar_09_2018', '%d_%m_%Y') ArgumentError (invalid strptime format - `%d_%m_%Y') > Date.strptime('01_09_2018', '%d_%m_%Y') Sat, 01 Sep 2018
other use cases:
ambiguous date strings
>> Date.parse('01.02.03') => Sat, 03 Feb 2001
In Germany you would expect this to be parsed as 01 Feb 2003.
Be more explicit and provide a date pattern:
>> Date.strptime('01.02.03', '%d.%m.%y') => Sat, 01 Feb 2003