How to calculate time elapsed for AM and PM

Hi,

I have below time array:

Start time     End time
23:12:17 PM   23:12:19 PM
3:12:11 AM    3:12:29 AM
23:59:17 PM   01:10:13 AM
11:59:17 AM   13:10:13 PM
I want to calculate time elapsed between Start time to End time of each row.

Answer 1

[Image Analyst]

See the help for etime().

[Mekala balaji]

Sir, it give negative value when it turn PM to AM (row 3) or AM to PM (row4)

[Image Analyst]

If the time is negative, add 24 hours to it.

[Mekala balaji]

Sir,

I tried as below, but it seems some problem,

t1={'23:59:00 PM'}

    t1 =

      cell

        '23:59:00 PM'

    >> t2={'00:1:00 AM'}

    t2 =

      cell

        '00:1:00 AM'

    >> t2={'12:1:00 AM'}

    t2 =

      cell

        '12:1:00 AM'

    >> t1=datevec(t1)

    t1 =

            2018           1           2          11          59           0

    >> t2=datevec(t2)

    t2 =

            2018           1           1           0           1           0

    >> etime(t2,t1)

    ans =

         -129480

Answer 2

[Star Strider]

You should add dates to each time, and delete the ‘AM’ and ‘PM’ since you are also using 24-hour times.

Try this:

SA = {'23:12:17'   '23:12:19'
    '3:12:11'    '3:12:29'
    '23:59:17'   '01:10:13'
    '11:59:17'   '13:10:13'};

DA = datetime(SA, 'InputFormat','HH:mm:ss');
BT = between(DA(:,1), DA(:,2));

It will give a negative value for Row 3, because the between function does not ‘know’ they are consecutive days, since you did not tell it.