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This caused me a bit of a headache last night and I wanted to understand why the getDate method in the Date object is 1 based (returns values from 1-31) while the getMonth method is 0 based (returns 0-11). I'm wondering why there is this inconsistency in methods for the same object.
I understand why it's difficult to change the behavior now but are there any reasons this was designed like this in the first place?
Documentation can be found here: http://www.w3schools.com/jsref/jsref_obj_date.asp
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This is because the getMonth method returns a zero-based number between 0 and 11 . For example, January is 0 , February is 1 , March is 2 , etc. If you need to get a one-based value for the month, simply add 1 to the result. Copied!
Zero-based counting Specifically, getMonth() counts from 0, whereas getDate() counts from 1.
JavaScript Date getTime() getTime() returns the number of milliseconds since January 1, 1970 00:00:00.
So I dropped Brendan Eich a tweet asking him the question (for those who don't know he is the creator of JS) and his response was:
@magrangs because that is how java.util.Date did it.
https://twitter.com/BrendanEich/status/179610205317902337
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