"Now" button click sets a wrong Value for the default Timezone.

[andriiash]

Use the next to reproduce:

$(function () {
        $('#MyTime').timepicker({
            timeFormat: 'TT hh:mm:ss',
            timeOnly: true
        });
    });

To reproduce:

1. Click on Now button.
2. Remember the Time value.
   3.Wait a few seconds.
3. Click on Now button again.
4. Compare a new value with the previous one.

For example, after the button click the "now" variable has value eqals "Mon Nov 16 2015 15:05:28 GMT+0200". The result of "now.getMinutes() + now.getTimezoneOffset() + tzoffset"
will be [5(int) + -120(int) + "120"(string)] equls "-115120" instead of 5 as expected, since "tzoffset" will have a string value for the default Timezone. Thus, after the now.setMinutes(-115120) call the date value will be elqual: "Fri Aug 28 2015 16:20:28 GMT+0300".

Fix:
The jquery-ui-timepicker-addon.js code:

$.timepicker.timezoneOffsetNumber = function (tzString) {
...
        if (!/^(\-|\+)\d{4}$/.test(normalized)) { // possibly a user defined tz, so just give it back
            return tzString;
        }
...
}

should be replaced by:

$.timepicker.timezoneOffsetNumber = function (tzString) {
...
        if (!/^(\-|\+)\d{4}$/.test(normalized)) { // possibly a user defined tz, so just give it back
            return parseInt(tzString);
        }
...
}

[trentrichardson]

I updated dev branch with this fix. Note that this completely kills the partial support that existed for custom alpha timezones (it was a use at your own risk anyway).

[andriiash]

Thanks a lot!

[MrPetovan]

I found that this issue is actually coming from _onTimeChange which sets the timepicker timezone as a string:
Line 828 of jquery-ui-timepicker-addon.js version v1.6.1

if (timezone !== false) {
    timezone = timezone.toString();
}

I would suggest to change to:

if (timezone !== false) {
    timezone = parseInt(timezone);
}

In order to keep the user-defined timezones.