timeParting.js - Returns {day|julian|yyyy-mm-dd|hh:00|offset|timezone}

timeParting.js

var timeParting = {
  /** 
   * @description returns utc offset based on local time (eg//utc-05 = central daylight time, north america)
   * a list of utc offsets and timezones can be found here: http://forbrains.co.uk/international_tools/earth_timezones
   * @param pv_date {date}
   */
  getTimezoneOffset: function (pv_date) {
    var offset = ((pv_date.getTimezoneOffset() / 60) * -1); //multiply by -1 to account for inverted utc offset in JS getTimezoneOffset()
    var posOrNeg = (offset > 0) ? "+" : "-";
    var tmpOffset = offset + "";
    tmpOffset = tmpOffset.split(".");
    var offsetLeft = Math.abs(tmpOffset[0]) + "";
    var offsetRight = ((tmpOffset[1] === "25") ? "15" : ((tmpOffset[1] === "5") ? "30" : ((tmpOffset[1] === "75") ? "45" : "00")));

    //build offset string
    offset = posOrNeg +
      ((offsetLeft < 10) ? "0" + offsetLeft : offsetLeft) //include leading 0, if necessary
      +
      ((offsetRight === "00") ? "" : ":" + offsetRight); //include partial hour info, if necessary

    return ("UTC" + offset);
  },

  /**
   * @description returns time zone 
   * @example America/Chicago
   */
  getTimezone: function () {
    return Intl.DateTimeFormat().resolvedOptions().timeZone;
  },

  /**
   * @param date {date}
   * @param granularity {=string} 'hour', defaults to minute ommitted or specified with any other value
   */
  getTime: function(date, granularity) {
    if(granularity === 'hour') {
      return ("0" + date.getHours()).slice(-2) + ":00";
    } else {
      return ("0" + date.getHours()).slice(-2) + ":" + ((date.getMinutes() < 10) ? "0" + date.getMinutes() : date.getMinutes());
    }
  },

  /** 
   * @description calculates current local date based on browser/client machine; returns date as string
   */
  getLocalTime: function () {
    var dayName = {
      0: "Sunday",
      1: "Monday",
      2: "Tuesday",
      3: "Wednesday",
      4: "Thursday",
      5: "Friday",
      6: "Saturday"
    }
    var date = new Date();
    var localDate = {
      time: this.getTime(date, 'hour'),
      weekday: dayName[date.getDay()],
      julian: Math.ceil((date - new Date(date.getFullYear(),0,1)) / 86400000),
      month: ("0" + (date.getMonth() + 1)).slice(-2),
      day: ("0" + date.getDate()).slice(-2),
      year: date.getFullYear(),
      offset: this.getTimezoneOffset(date),
      timezone: this.getTimezone()
    }
    var retVal =
      localDate.weekday + "|" +
      localDate.julian + "|" +
      localDate.year + "-" + localDate.month + "-" + localDate.day + "|" +
      localDate.time + "|" +
      localDate.offset + "|" +
      localDate.timezone;
    return (retVal);
  }
}

// timeParting.getLocalTime();