Calculate Date/Time Difference in Java considering AM/PM

Question

I want to calculate the difference between two date/time in java using Date and Calendar classes. The format that I have is \"2012-01-24 12:30:00 PM\".

I have implem

Answer 1

So, you have these dates as strings? Parse them with a SimpleDateFormat with the appropriate format string, and compute the difference in hours:

DateFormat df = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss a");

Date d1 = df.parse("2012-01-24 12:30:00 PM");
Date d2 = df.parse("2012-01-24 02:30:00 PM");

int hoursDifference = (int)((d2.getTime() - d1.getTime()) / 3600000L);
System.out.println("Difference in hours: " + hoursDifference);

Your error is that you are using HH (24-hour hours) instead of hh (12-hour hours) in your format string.