Finding time difference in Ruby

Finding time difference between two dates or times is very simple in ruby. It is just like doing arithmetic subtraction. We can do it for different formats in the following way:

Date

d1 = Date.parse("2010-08-23")

d2 = Date.parse("2010-08-24")

day_diff = (d2 - d1).to_i     # returns number of days

DateTime

dt1 = DateTime.strptime("2009/04/16 19:52:30", "%Y/%m/%d %H:%M:%S").to_time

dt2 = DateTime.strptime("2009/04/17 19:52:30", "%Y/%m/%d %H:%M:%S").to_time

time_diff = dt2-dt1    # returns time difference in seconds

Time

t1 = Time.parse("2010-08-24 01:20:00")

 t2 = Time.parse("2010-08-24 05:20:00")

time_diff =  t2-t1        # returns time difference in seconds