Forces all dates in the browser to use UTC

force-utc-date.coffee

# force dates to be UTC
__timezoneOffset = (new Date).getTimezoneOffset() * 60 * 1000
__dateWrapper = (original) ->
  ->
    unless @__hacked
      @__hacked = yes
      @setTime @getTime() - __timezoneOffset
      try
        res = original.apply @, arguments
      catch err
      @setTime @getTime() + __timezoneOffset
      delete @__hacked
      throw err if err
      res
    else
      original.apply @, arguments
['getDate', 'getDay', 'getFullYear', 'getHours', 'getMilliseconds', 'getMinutes', 'getMonth', 'getSeconds',
 'getTimezoneOffset', 'getYear', 'setDate', 'setFullYear', 'setHours', 'setMilliseconds', 'setMinutes',
 'setMonth', 'setSeconds', 'setYear', 'toLocaleDateString', 'toLocaleTimeString', 'toLocaleString'].forEach (name) ->
  Date::[name] = __dateWrapper Date::[name]
Date::toString = Date::toUTCString
Date::toDateString = ->
  y = "#{@getUTCFullYear()}"
  @toUTCString().split(y).shift().replace /\s*$/, ''
Date::toTimeString = ->
  y = "#{@getUTCFullYear()}"
  (@toUTCString().split(y).pop() + y).replace /^\s*/, ''
Date::getTimezoneOffset = -> 0

force-utc-date.js

(function(){
  var __dateWrapper, __timezoneOffset;
  
  __timezoneOffset = (new Date).getTimezoneOffset() * 60 * 1000;
  
  __dateWrapper = function(original) {
    return function() {
      var err, res;
      if (!this.__hacked) {
        this.__hacked = true;
        this.setTime(this.getTime() - __timezoneOffset);
        try {
          res = original.apply(this, arguments);
        } catch (_error) {
          err = _error;
        }
        this.setTime(this.getTime() + __timezoneOffset);
        delete this.__hacked;
        if (err) {
          throw err;
        }
        return res;
      } else {
        return original.apply(this, arguments);
      }
    };
  };
  
  ['getDate', 'getDay', 'getFullYear', 'getHours', 'getMilliseconds', 'getMinutes', 'getMonth', 'getSeconds',
  'getTimezoneOffset', 'getYear', 'setDate', 'setFullYear', 'setHours', 'setMilliseconds', 'setMinutes',
  'setMonth', 'setSeconds', 'setYear', 'toLocaleDateString', 'toLocaleTimeString', 'toLocaleString'
  ].forEach(function(name) {
    Date.prototype[name] = __dateWrapper(Date.prototype[name]);
  });
  
  Date.prototype.toString = Date.prototype.toUTCString;
  
  Date.prototype.toDateString = function() {
    var y;
    y = "" + (this.getUTCFullYear());
    return this.toUTCString().split(y).shift().replace(/\s*$/, '');
  };
  
  Date.prototype.toTimeString = function() {
    var y;
    y = "" + (this.getUTCFullYear());
    return (this.toUTCString().split(y).pop() + y).replace(/^\s*/, '');
  };
  
  Date.prototype.getTimezoneOffset = function() {
    return 0;
  };
})();