How to convert a string to a time in JS and calculate the difference

In the foreground page development usually use to calculate two time difference, first attach the implementation method

[JavaScript]View PlainCopy 

2. End time
4. End_str = ("2014-01-01 10:15:00"). Replace (/-/g,"/");   Generally get the format of the time is: Yyyy-mm-dd hh24:mi:ss, so I use this as an example, is the format, you do not have to replace.
6. var end_date = new Date (END_STR); Convert a string to a time
8. Start time
10. Sta_str = ("2014-01-01 10:15:00"). Replace (/-/g,"/");
12. var sta_date = new Date (STA_STR);
14. var num = (end_date-sta_date)/(1000*3600*24); //Find out the time difference between two times, this is the number of days
16. var days = parseint (Math.ceil (num)); //Convert to full day (less than 0 of the play does not have to turn)
20. The following is attached to the JS in some of the methods for Time class operation
22. var mydate = new Date ();
24. Mydate.getyear (); //Get Current year (2-bit)
26. Mydate.getfullyear ();    //Get the full year (4-bit, 1970-????)
28. Mydate.getmonth (); //Get the current month (0-11, 0 for January)
30. Mydate.getdate (); //Get current day (1-31)
32. Mydate.getday (); //Get Current week x (0-6, 0 for Sunday)
34. Mydate.gettime (); //Gets the current time (number of milliseconds since 1970.1.1)
36. Mydate.gethours (); //Get current hours (0-23)
38. Mydate.getminutes (); //Gets the current number of minutes (0-59)
40. Mydate.getseconds (); //Gets the current number of seconds (0-59)
42. Mydate.getmilliseconds (); //Gets the current number of milliseconds (0-999)
44. Mydate.tolocaledatestring (); //Get the current date
46. var mytime=mydate.tolocaletimestring (); //Get current time
48. Mydate.tolocalestring ();   //Get date and time----if it involves a minute or seconds, use it directly.

How to convert a string to a time in JS and calculate the difference