RangeError: invalid date

The JavaScript exception "invalid date" occurs when a string leading to an invalid date has been provided to Date or Date.parse().

A string leading to an invalid date has been provided to Date or Date.parse().

Unrecognizable strings or dates containing illegal element values in ISO formatted strings usually return NaN. However, depending on the implementation, non–conforming ISO format strings, may also throw RangeError: invalid date, like the following cases in Firefox:

new Date('foo-bar 2014');
new Date('2014-25-23').toISOString();
new Date('foo-bar 2014').toString();

This, however, returns NaN in Firefox:

Date.parse('foo-bar 2014'); // NaN

For more details, see the Date.parse() documentation.

• Date
• Date.prototype.parse()
• Date.prototype.toISOString()