dayjs/esm/plugin/utc/index.js

2KB immutable date time library alternative to Moment.js with the same modern API

export default (function (option, Dayjs, dayjs) {
  var proto = Dayjs.prototype;

  dayjs.utc = function (date, format) {
    var cfg = {
      date: date,
      utc: true,
      format: format
    };
    return new Dayjs(cfg); // eslint-disable-line no-use-before-define
  };

  proto.utc = function () {
    return dayjs(this.toDate(), {
      locale: this.$L,
      utc: true
    });
  };

  proto.local = function () {
    return dayjs(this.toDate(), {
      locale: this.$L,
      utc: false
    });
  };

  var oldParse = proto.parse;

  proto.parse = function (cfg) {
    if (cfg.utc) {
      this.$u = true;
    }

    oldParse.call(this, cfg);
  };

  var oldInit = proto.init;

  proto.init = function () {
    if (this.$u) {
      var $d = this.$d;
      this.$y = $d.getUTCFullYear();
      this.$M = $d.getUTCMonth();
      this.$D = $d.getUTCDate();
      this.$W = $d.getUTCDay();
      this.$H = $d.getUTCHours();
      this.$m = $d.getUTCMinutes();
      this.$s = $d.getUTCSeconds();
      this.$ms = $d.getUTCMilliseconds();
    } else {
      oldInit.call(this);
    }
  };

  var oldUtcOffset = proto.utcOffset;

  proto.utcOffset = function () {
    if (this.$u) {
      return 0;
    }

    return oldUtcOffset.call(this);
  };

  var oldFormat = proto.format;
  var UTC_FORMAT_DEFAULT = 'YYYY-MM-DDTHH:mm:ss[Z]';

  proto.format = function (formatStr) {
    var str = formatStr || (this.$u ? UTC_FORMAT_DEFAULT : '');
    return oldFormat.call(this, str);
  };

  proto.isUTC = function () {
    return !!this.$u;
  };
});