dist/gregorian.js
function resetLocalOrResetUTC(increment, date, utc) {
  var _incrementHandlers;

  var incrementHandlers = (_incrementHandlers = {}, defineProperty(_incrementHandlers, SECOND, function (date) {
    return new Date(date['set' + utc + 'Seconds'](date['get' + utc + 'Seconds'](), 0));
  }), defineProperty(_incrementHandlers, MINUTE, function (date) {
    return new Date(date['set' + utc + 'Minutes'](date['get' + utc + 'Minutes'](), 0, 0));
  }), defineProperty(_incrementHandlers, HOUR, function (date) {
    return new Date(date['set' + utc + 'Hours'](date['get' + utc + 'Hours'](), 0, 0, 0));
  }), defineProperty(_incrementHandlers, DATE, function (date) {
    date['set' + utc + 'Date'](date['get' + utc + 'Date']());
    date['set' + utc + 'Hours'](0, 0, 0, 0);

    return new Date(date);
  }), defineProperty(_incrementHandlers, WEEK, function (date) {
    date['set' + utc + 'Date'](date['get' + utc + 'Date']() - date['get' + utc + 'Day']());
    date['set' + utc + 'Hours'](0, 0, 0, 0);

    return new Date(date);
  }), defineProperty(_incrementHandlers, MONTH, function (date) {
    date['set' + utc + 'Month'](date['get' + utc + 'Month'](), 1);
    date['set' + utc + 'Hours'](0, 0, 0, 0);

    return new Date(date);
  }), defineProperty(_incrementHandlers, YEAR, function (date) {
    date['set' + utc + 'FullYear'](date['get' + utc + 'FullYear'](), 0, 1);
    date['set' + utc + 'Hours'](0, 0, 0, 0);

    return new Date(date);
  }), _incrementHandlers);

  return incrementHandlers[increment](date);
}
function resetLocalOrResetUTC(increment, date, utc) {
  var _incrementHandlers;

  var incrementHandlers = (_incrementHandlers = {}, defineProperty(_incrementHandlers, SECOND, function (date) {
    return new Date(date['set' + utc + 'Seconds'](date['get' + utc + 'Seconds'](), 0));
  }), defineProperty(_incrementHandlers, MINUTE, function (date) {
    return new Date(date['set' + utc + 'Minutes'](date['get' + utc + 'Minutes'](), 0, 0));
  }), defineProperty(_incrementHandlers, HOUR, function (date) {
    return new Date(date['set' + utc + 'Hours'](date['get' + utc + 'Hours'](), 0, 0, 0));
  }), defineProperty(_incrementHandlers, DATE, function (date) {
    date['set' + utc + 'Date'](date['get' + utc + 'Date']());
    date['set' + utc + 'Hours'](0, 0, 0, 0);

    return new Date(date);
  }), defineProperty(_incrementHandlers, WEEK, function (date) {
    date['set' + utc + 'Date'](date['get' + utc + 'Date']() - date['get' + utc + 'Day']());
    date['set' + utc + 'Hours'](0, 0, 0, 0);

    return new Date(date);
  }), defineProperty(_incrementHandlers, MONTH, function (date) {
    date['set' + utc + 'Month'](date['get' + utc + 'Month'](), 1);
    date['set' + utc + 'Hours'](0, 0, 0, 0);

    return new Date(date);
  }), defineProperty(_incrementHandlers, YEAR, function (date) {
    date['set' + utc + 'FullYear'](date['get' + utc + 'FullYear'](), 0, 1);
    date['set' + utc + 'Hours'](0, 0, 0, 0);

    return new Date(date);
  }), _incrementHandlers);

  return incrementHandlers[increment](date);
}
Sets the date or time to the start of the specified increment
@param   {String}    increment   an increment to set the date back to
@param   {Date}      date        a date object
@returns {Date}                  a new date