JavaScript calculates the time difference for a two date object

2. var st1 = "2008-8-1 8:50:01";
4. var st2 = "2008-8-3 8:50:01";
6. var time1 = new Date (ST1); //Creation time 1
8. var tiem2 = new Date (ST2); //Creation time 2
10. /*
12. * If the time difference is the number of days is 864000000, if the number of hours in this number
14. * Divided by 24, minutes divided by 60, and so on
16. */
18. var days = (Time1.gettime ()-time2.gettime ())/86400000;
20. alert (days);

JavaScript calculates the time difference for a two date object