I did look back to see other conversations about Dates.... Operating with arbitrary timezones https://mail.mozilla.org/pipermail/es-discuss/2016-August/046478.html
Add timezone data to Date https://mail.mozilla.org/pipermail/es-discuss/2017-June/048259.html Even until this moment, Edge/IE cannot parse new Date( "2018-09-25T00:17:55.385-07:00"). which makes 50% of the world already require a date/time library. https://github.com/Microsoft/ChakraCore/issues/5502 (actually Aug 16 that was closed) Date.toISOString() only emits 'Z', even though the type itself has the offset as a Date.prototype.toISOLocalString() cb : function () { var tzo = -this.getTimezoneOffset(), dif = tzo >= 0 ? '+' : '-', pad = function(num) { var norm = Math.floor(Math.abs(num)); return (norm < 10 ? '0' : '') + norm; }; return this.getFullYear() + '-' + pad(this.getMonth() + 1) + '-' + pad(this.getDate()) + 'T' + pad(this.getHours()) + ':' + pad(this.getMinutes()) + ':' + pad(this.getSeconds()) + dif + pad(tzo / 60) + ':' + pad(tzo % 60); } ---------- But; that's only semi-accurate, because if I say -07:00 as the offset, I don't know if it's MST or PDT (which is knowable I suppose). There's not a LOT of usage of times in code; but it could be that the constant number 2018-09-25T00:26:00.741Z could just BE a Date, similar to 123n just being a BigInt. It would also be handy if there were a builtin ISO w/ Timezone emitter.
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