¶MockDate.js

getJasmineRequireObj().MockDate = function() {
  function MockDate(global) {
    var self = this;
    var currentTime = 0;

    if (!global || !global.Date) {
      self.install = function() {};
      self.tick = function() {};
      self.uninstall = function() {};
      return self;
    }

    var GlobalDate = global.Date;

    self.install = function(mockDate) {
      if (mockDate instanceof GlobalDate) {
        currentTime = mockDate.getTime();
      } else {
        currentTime = new GlobalDate().getTime();
      }

      global.Date = FakeDate;
    };

    self.tick = function(millis) {
      millis = millis || 0;
      currentTime = currentTime + millis;
    };

    self.uninstall = function() {
      currentTime = 0;
      global.Date = GlobalDate;
    };

    createDateProperties();

    return self;

    function FakeDate() {
      switch(arguments.length) {
        case 0:
          return new GlobalDate(currentTime);
        case 1:
          return new GlobalDate(arguments[0]);
        case 2:
          return new GlobalDate(arguments[0], arguments[1]);
        case 3:
          return new GlobalDate(arguments[0], arguments[1], arguments[2]);
        case 4:
          return new GlobalDate(arguments[0], arguments[1], arguments[2], arguments[3]);
        case 5:
          return new GlobalDate(arguments[0], arguments[1], arguments[2], arguments[3],
                                arguments[4]);
        case 6:
          return new GlobalDate(arguments[0], arguments[1], arguments[2], arguments[3],
                                arguments[4], arguments[5]);
        case 7:
          return new GlobalDate(arguments[0], arguments[1], arguments[2], arguments[3],
                                arguments[4], arguments[5], arguments[6]);
      }
    }

    function createDateProperties() {

      FakeDate.now = function() {
        if (GlobalDate.now) {
          return currentTime;
        } else {
          throw new Error('Browser does not support Date.now()');
        }
      };

      FakeDate.toSource = GlobalDate.toSource;
      FakeDate.toString = GlobalDate.toString;
      FakeDate.parse = GlobalDate.parse;
      FakeDate.UTC = GlobalDate.UTC;
    }
  }

  return MockDate;
};