Wait a minute. I may be misunderstanding here, but all of this discussion sounds misguided to me.
A Date is intended to represent a specific instance in time, irrespective of time zone. You don't want to go adding time-zone-related fields to the Date object. Time zone becomes important when you're doing calculations on a time (converting it into year/month/day/hour/minute/second, etc.) or when you're converting it to a textual representation for display to the user. This is what the DateTimeFormat class in the ECMAScript internationalization spec is for, and it handles time zone. There's still a lot of work to do there, of course, but let's not break the whole model. --Rich Gillam Internationalization geek On Feb 19, 2013, at 9:52 PM, Jonathan Adams wrote: > I understand that an implementation of ECMAScript is expected to determine > the local time zone adjustment [1]. > > This is really convenient -- most of the time. However, it would be great to > override this for a given Date object. It doesn't appear that we can at the > moment [2] or in ES6. > > If we could override this context, we can then take advantage of some of the > other native methods such as Date.toString(), Date.getDate() etc. using our > preferred, altered LocalTZA rather than users having to build horrible > user-land functions [3] and wrestle with daylight savings time adjustments > [4]. > > My particular use-case involves taking dates generated in CST, stored as UTC > (this is good) but then I want to offer a list of dates relative to CST, but > this is processed in a context with LocalTZA for PST. I can get away with > faking it by calculating the difference in timezones and altering the > timestamp used to generate a new Date object but, this is going to > technically be off at some points in time (DST adjustment for example) and > feels wrong/hacky. > > -Jon- > > [1] http://people.mozilla.org/~jorendorff/es6-draft.html#sec-15.9.1.7 > [2] > http://stackoverflow.com/questions/9369972/can-i-set-the-local-timezone-in-my-browser-via-javascript > [3] > http://www.techrepublic.com/article/convert-the-local-time-to-another-time-zone-with-this-javascript/6016329 > [4] https://mail.mozilla.org/pipermail/es-discuss/2011-March/013322.html > _______________________________________________ > es-discuss mailing list > es-discuss@mozilla.org > https://mail.mozilla.org/listinfo/es-discuss _______________________________________________ es-discuss mailing list es-discuss@mozilla.org https://mail.mozilla.org/listinfo/es-discuss
