newbie time difference

Question

good day!

i need help and be guided on the right path here, i'm pretty sure i'm lost. im trying to compute for time diffrence for start time and end time manually versus automatic ex. online computation.

start time =08:55 am end time =13:22 pm

for manual computation, i did this.

8-13 =4 hrs 55-22 =33 min

I know that getting the time difference is by subtracting both start time(hour) -end time(hour) and both start time(minutes) -end time(minutes) combine both =4:33 hrs in total manually

I did not *60 or divide 60 because its not over 60.

my problem is when I try computing this online ex:http://www.onlineconversion.com/days_between_advanced.htm http://www.grun1.com/utils/timeDiff.cfm

the total time is: 4:27:00 hrs

is there another computation that needs to be done. if so can you help me. am i wrong

thank you

$8-13=4$?? Not $8-13=-5$? I think this is where your confusion starts. — Gerry Myerson, Apr 17 '13 at 06:21
thank you for your response, sorry for the wrong entry for 8-13 =4, i did not notice it until you pointed it out. — newb31, Apr 17 '13 at 22:34

Librecoin · Answer 1 · 2013-04-17T11:14:22.000

1

Count hours and minutes separately, and then use the fact that $1$:$00=0$:$60$.

$13$:$22-08$:$55=(13-8)$:$(22-55)=5$:$(-33)=4$:$27$

edited Apr 17 '13 at 11:14

answered Apr 17 '13 at 10:59

Librecoin

2,740

thank you for your immediate response, cant wait to try this on other computation i'll do next. – newb31 Apr 17 '13 at 22:38

newbie time difference

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