| 'use strict'; |
| |
| var callBind = require('call-bind'); |
| |
| var I402 = typeof Intl === 'undefined' ? null : Intl; |
| var DateTimeFormat = I402 && I402.DateTimeFormat; |
| var resolvedOptions = DateTimeFormat && callBind(DateTimeFormat.prototype.resolvedOptions); |
| |
| // https://262.ecma-international.org/15.0/#sec-systemtimezoneidentifier |
| |
| module.exports = function SystemTimeZoneIdentifier() { |
| if (DateTimeFormat && resolvedOptions) { |
| return resolvedOptions(new DateTimeFormat()).timeZone; // steps 2 - 3 |
| |
| } |
| |
| return 'UTC'; // step 1 |
| }; |