jquery-ui-timespinner.js

/**
 * timespinner "hh:mm"
 */
$.widget( "ui.timespinner", $.ui.spinner, {
    options: { step: 1, page: 1 },
    _parse: function( value ) {
        if ( typeof value === "string" ) {
            if ( Number( value ) == value ) {
                return Number( value );
            }
            if(value == '') {
                return null;
            }
            var t = value.split(':', 2);
            var n = (Number(t[0]) * 60 + Number(t[1]));
            return Number(n);
        }
        return value;
    },
    _format: function( value ) {
        if(value == null) {
            return '';
        }
        var v = Number(value);
        while(v < 0) {
            v += (24 * 60);
        }
        v = (v % (24 * 60));
        var mm = "00" + (v % 60);
        mm = mm.substring(mm.length - 2);
        var hh = "00" + (Math.floor(v / 60) % 24);
        hh = hh.substring(hh.length - 2);
        return hh + ":" + mm;
    }
});