you use moment or moment-timezone?
I run follow lines now maybe help you :
var moment = require("moment");
var momentTimezone = require("moment-timezone");
const elevenMthsAgoS = moment().subtract(11, "months").startOf("date");
console.log(elevenMthsAgoS); // Moment<2020-02-25T00:00:00+03:30>
console.log(elevenMthsAgoS.format()); // 2020-02-25T00:00:00+03:30
var jun = momentTimezone("2014-06-01T12:00:00Z");
var dec = momentTimezone("2014-12-01T12:00:00Z");
console.log(jun.tz('America/Los_Angeles').format('ha z')); // 5am PDT
console.log(dec.tz('America/Los_Angeles').format('ha z')); // 4am PST
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