Though support may be limited, is there a way to parse a datetime string to utc/unix (locale & time zone aware) in new Intl (http://www.ecma-international.org/ecma-402) spec, something similar using moment
http://momentjs.com/timezone/docs/, http://momentjs.com/docs/
var newYork = moment.tz("2014-06-01 12:00", "America/New_York");
var unix = newYork.valueOf();
note: I haven't tried above, but reading the API, I think this may be a way.
Edit:
the question was a specific instance of internationalization as I wanted to parse user input in a locale aware manner. Example, numbers (1,000 and 1.000 may be equal depending on locale). same way user may enter time as lundi 27 juin 2016 10:15
in dt picker/text field, which needed to be parsed.