JS calculates the time difference (days, hours, minutes, seconds)

2. <script type="Text/javascript" >
4. var date1= ' 2015/05/01 00:00:00 '; //Start time
6. var date2 = new Date (); //End time
8. var date3 = Date2.gettime ()- new Date (date1). GetTime (); //The number of milliseconds for the time difference
12. //------------------------------  
16. //Calculate the difference in days
18. var Days=math.floor (date3/(24*3600*1000))
22. //Calculate the number of hours
26. var leave1=date3% (24*3600*1000) //Number of milliseconds remaining after counting days
28. var Hours=math.floor (leave1/(3600*1000))
30. //Calculate the number of minutes difference
32. var leave2=leave1% (3600*1000) //Calculate the number of milliseconds left after hours
34. var Minutes=math.floor (leave2/(60*1000))
36. //Calculate the number of seconds difference
38. var leave3=leave2% (60*1000) //Calculate the number of milliseconds left after the minutes
40. var seconds=math.round (leave3/1000)
42. Alert ("difference" +days+"Days" +hours+"hours" +minutes+"minutes" +seconds+"Seconds")
44. </script>

JS calculates the time difference (days, hours, minutes, seconds)