Change JavaScript Date in Chrome

Use:

    var fake_date = new Date("October 6, 2016 11:13:00");    //overriding date function    Date = function(){return fake_date;};    var new_date = new Date();    alert(new_date);

You would need to write a function that wraps new Date and returns a modified version of the date. For example:

/** * Overwrite Date constructor with configurable current time * @param {object} Date         - The native Date object * @param {Number} year         - Optional. Default year to this. * @param {Number} month        - Optional. Default month to this. * @param {Number} day          - Optional. Default day to this. * @param {Number} minute       - Optional. Default minute to this. * @param {Number} second       - Optional. Default second to this. * @param {Number} milliseconds - Optional. Default milliseconds to this. */Date = function (Date, year, month, day, hour, minute, second, milliseconds) {    function MyDate() {        // Get arguments passed into new Date()        var args = Array.prototype.slice.call(arguments);        // Add null to start        args.unshift(null);        // Call new Date() with the original arguments        var date = new (Function.prototype.bind.apply(Date, args));        if (typeof year !== 'undefined' && arguments.length === 0) {            date.setFullYear(year);        }        if (typeof month !== 'undefined' && arguments.length === 0) {            date.setMonth(month);        }        if (typeof day !== 'undefined' && (arguments.length === 0 || arguments.length === 2)) {            date.setDate(day);        }        if (typeof hour !== 'undefined' && (arguments.length === 0 || arguments.length === 3)) {            date.setHours(hour);        }        if (typeof minute !== 'undefined' && (arguments.length === 0 || arguments.length === 4)) {            date.setMinutes(minute);        }        if (typeof second !== 'undefined' && (arguments.length === 0 || arguments.length === 5)) {            date.setSeconds(second);        }        if (typeof milliseconds !== 'undefined' && (arguments.length === 0 || arguments.length === 6)) {            date.setMilliseconds(milliseconds);        }        return date;    }    MyDate.prototype = Date.prototype;    return MyDate;}(Date);

On the last line you can specify values for overwriting the current time:

}(Date, 1990); // Year}(Date, 1990, 05); // Year/month}(Date, 1990, 05, 11); // Year/month/day}(Date, 1990, 05, 11, 13); // Year/month/day Hour}(Date, 1990, 05, 11, 13, 05); // Year/month/day Hour:minute}(Date, 1990, 05, 11, 13, 05, 01); // Year/month/day Hour:minute:second

The benefit of this is that any existing new Date() calls with arguments still work correctly:

new Date(2001, 02, 03);> Mar 03 2001

Also time is not frozen so the seconds value will increase with the normal clock:

// Year changed to 1990console.log(new Date());setTimeout(function(){    console.log(new Date());}, 5000);> Thu Oct 11 1990 17:02:17 GMT+1100 (AUS Eastern Daylight Time)> Thu Oct 11 1990 17:02:22 GMT+1100 (AUS Eastern Daylight Time)

Just use the setTime function:

var d = new Date();d.setTime(1332403882588);

The int parameter is the UNIX timestamp in milliseconds.