new Date() is working in Chrome but not Firefox

This works in all browsers -

new Date('2001/01/31 12:00:00 AM')

new Date('2001-01-31 12:00:00')

Format: YYYY-MM-DDTHH:mm:ss.sss

Details: http://www.ecma-international.org/ecma-262/5.1/#sec-15.9.1.15

You can't instantiate a date object any way you want. It has to be in a specific way. Here are some valid examples:

new Date() // current date and time
new Date(milliseconds) //milliseconds since 1970/01/01
new Date(dateString)
new Date(year, month, day, hours, minutes, seconds, milliseconds)

or

d1 = new Date("October 13, 1975 11:13:00")
d2 = new Date(79,5,24)
d3 = new Date(79,5,24,11,33,0)

Chrome must just be more flexible.

Source: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date

From apsillers comment:

the EMCAScript specification requires exactly one date format (i.e., YYYY-MM-DDTHH:mm:ss.sssZ) but custom date formats may be freely supported by an implementation: "If the String does not conform to that [ECMAScript-defined] format the function may fall back to any implementation-specific heuristics or implementation-specific date formats." Chrome and FF simply have different "implementation-specific date formats."