Date.toW3CString

Add Date.toW3CString method to the Date class. The method return a date string in the W3C date time format: yyyy-mm-ddThh:ii:ss+zz:zz.

Comparison of datetime formats

Method / Format	Result
Date.toGMTString()	Sat, 21 Nov 2015 08:27:38 GMT
Date.toUTCString()	Sat, 21 Nov 2015 08:27:38 GMT
Date.toISOString()	2015-11-21T08:27:38.567Z
Date.toW3CString()	2015-11-21T09:27:38+01:00