Tests for Date.toISOString On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". PASS Date.toISOString.call({}) threw exception TypeError: 'undefined' is not an object (evaluating 'Date.toISOString.call'). PASS Date.toISOString.call(0) threw exception TypeError: 'undefined' is not an object (evaluating 'Date.toISOString.call'). PASS new Date(0).toISOString() is '1970-01-01T00:00:00.000Z' PASS new Date('1 January 1500 UTC').toISOString() is '1500-01-01T00:00:00.000Z' PASS new Date('1 January 2000 UTC').toISOString() is '2000-01-01T00:00:00.000Z' PASS new Date('1 January 4000 UTC').toISOString() is '4000-01-01T00:00:00.000Z' PASS new Date('1 January 100000 UTC').toISOString() is '100000-01-01T00:00:00.000Z' PASS new Date('10 March 2000 UTC').toISOString() is '2000-03-10T00:00:00.000Z' PASS new Date(NaN).toISOString() is 'Invalid Date' PASS successfullyParsed is true TEST COMPLETE