math question! - calculate time

[Naethyn]

Anyone know a formula to calculate total amount of time elapsed?

Say its 09:03am and you want to find out how long of a time passed at 4:57pm.

It seems like an easy question and maybe a full day of work has shut my brain down but I can't think on a formula to calculate it.

I'm not looking for the answer but how you arrived at the answer!

[Ganzo]

millitary time.
4:57pm = 16,57
09:03am = 9,03

16,57 - 9.03 = 7,54

elapsed time is 7 hrs and 54 min

[Phlegm]

millitary time.
4:57pm = 16,57
09:03am = 9,03

16,57 - 9.03 = 7,54

elapsed time is 7 hrs and 54 min

not alway correct since time is base 60 not base 10.

[Dylan]

Buy a watch.

[Gidan]

Convert to military time first

Next convert both times into minutes
Start Time in Minutes = Start Hour * 60 + Start Minute
End Time in Minutes = End Hour * 60 + End Minute

Get the Difference between the 2
If Start Time in Minutes > End Time in Minutes
Total difference in minutes = 1440 - Start Time in Minutes + End Time in Minutes
If End Time in Minutes > or = Start Time in Minutes
Total difference in minutes = End Time in Minutes - Start Time in Minutes

Determin the number of minutes passed
Total Minutes passed = Total Difference in Minutes MOD 60

Determin the number of hours passed
Total Hours passed = Total Difference in Minutes DIV 60

Your elapsed time
Total Elapsed time = Total Hours Passed : Total Minutes Passed


Its not quick but it will give you the time your looking for. Its the easiest way to deal with the minutes.

[Phlegm]

The easiest way to find the time is by adding instead of subtracting.

For instance: time elapsed between 3:48 am and 7:25 pm:

12 minutes to 4 am.
15 hours between 4 am to 7 pm.
25 minutes between 7 pm to 7:25 pm.

add them up 15 hrs+25minutes+12 minutes = 15:37 is the time elapsed.

By adding you don't have to worry about the converting.

[brinstar]

math

[Griever]

math

[Granh]

? = ((AE+12)-AS)
AE = Absolute End
AS = Absolute Start

Convert the minutes to an absolute by dividing them by 60. This will return a number easier to work with.

I.E.
9:03 would convert to 9.05 (3 divide 60 = 0.05)
4:57 would convert to 4.95 (57 divide 60 = 0.95)

If you take these numbers and this formula you can find the absolute difference.

? = ((4.95+12)-9.05)

? = 7.9

Take the decimal and convert it back by multiplying 60 by the decimal in % form.

0.9 = 90% (60*90%=54)

Elapsed Time = 7:54

Example was easier done with just military but if end minutes is less than start minutes this is faster.

9:47am to 8:12pm?

? = ((8.2+12)-9.78)
? = 10.42
Elapsed Time = 10:25

[Phlegm]

I think my way is still faster.