Sorry very basic libreoffice time calculations hours

[DLX]

I have looked at videos, bit don't get right out come  :-[ My maths just as great and my English.
using libreoffice spreadsheet

what would like is to add up hours from on time to end time (should be easy)

I put start time in column B Cell 2 = B2 and end time in column C Cell 2

10:00 B2 15:00 C2 in column D Cell 2 =C2-B2 then hit enter done show me hours from start to end.
once I get the hours I would like a total then up to.

I also clicked in cell format cell to numbers and get error Err:552[table][tr][td][/td][/tr][/table]Thanks
Sorry did say very basic.



- 15:15 why -
I know i'm doing this the slow way =Cx - Bx how would add left column B to C column please.
instead of

=C2-B2
=C3-B3
=C3-B4
=C5-B5
so on


thanks  :-[




Thanks

[DLX]

Kind got it working but not over night

21:00 - 07:30

  [table]  [tr] [td]

21.00

[/td] [td]

04:30

[/td] [td]

-20.81

[/td] [/tr] [/table]

wrong  :-\
  [table]  [tr] [td][/td] [td][/td] [td][/td] [/tr] [/table]

[Wirezfree]

Hi,

The issue is the "past midnight" calc.
I dug out an old Excel sheet, and knocked this up, it still works in Libre Calc.



The field that does the difference needs to do a check,
I think I got this of the web/colleague..??

In the sum/difference cell you need to have:

Example:
Cell E2 contains =D2-C2+(C2>D2)

I can send you this if you PM me an emaill addy.

[justme2]

I've just played with Libre  Calc and it seems all you need to do is set the cell format to time as hh:mm then subtract start time from end and sum the total time cells. Calc appears to take care of passing midnight events.

See http://superuser.com/questions/387106/li...mmss-cells for the format for the total hours cell

[DLX]

I will read tomorrow with program open
Thanks for time n effort both  [emoji41]

[Wirezfree]

@ Dyslexic...

Have pm'd & emailed you...
Best I can do/offer...
Hopefully you can see how it works.

Dave

[DLX]

Many thank.
I make copy before taking it apart.