Fix javascript setMonth() glitch when moving between months of differ…

[dsl101]

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[dsl101]

Aargh. Sorry - just noticed it doesn't handle the year wraparound (Dec 2017 → Jan 2018, etc.). I will work on another revision...

[dsl101]

OK - I think that's got it. Just taking the __mod() in the wrong place.

[rstoenescu]

Hi,

First of all, thank you for taking time for this PR! While checking out the source code, I have also discovered same glitches in "date" utils and went for another approach (I hope you don't mind).

[dsl101]

No problem at all - just glad it's fixed. Also glad to see the force parameter has disappeared. I could not figure out what it was there for :).