Hi 
Thanks PLO. Now that you have confirmed that is likely to be the issue i played
around with "Format Cells". I couldn't get an ideal answer that shows a - even
when the cell is empty but i could get one when the cell has 0 value.
Select the range of cells and from the top menus select
Format - Cells - Number
and look in the bottom box "Format code". The standard format for time is
HH:MM
which pedantically only covers +ve values. Adding something specific for -ve
values, such as
HH:MM;[RED]HH:MM
helps 'flag-up' if soemthing has gone badly wrong. The ; (semi-colon) allows
negative values to have their own formatting rather than just defaulting to
whatever +ve values have. A next ; allows us to set how we want 0 values to be
treated so
HH:MM;[RED]HH:MM ;-
puts a - instead of a 0 value. Note that values that are close enough to 0 to
be rounded to 0 are still shown as either black or red 00:00s in that example.
I tried adding more ; to see if that would let us give a - for an empty value
but it didn't work. I'm sure there is a tick-box somewhere to do that but it
doesn't seem to be in the format cells dialogue box in 3.3.2.
Regards from
Tom 
From: PLO <protect.libreoffice@inboxshield.co.uk>
To: users@libreoffice.org
Sent: Sat, 4 June, 2011 14:58:49
Subject: Re: [libreoffice-users] Re: Calc: Has anyone tested the
backward-compatibility of LibreOffice 3.4?
Hello prholland,
> The following screenshot is taken from a spreadsheet that previously showed
> "00:00" in LibreOffice 3.3.2, where LibreOffice 3.4.0 is now showing
> "#VALUE!" (NB: all the cells are formatted as Time values, and the "text"
> cells contain "-"):
Tom is correct, just tried it. If the cell is formatted as time, you get
'#VALUE!' as '-' isn't recognised as a time value. Taking the '-' out and
leaving the cells empty works.
I've worked with time sheets in 3.3.2 as well but then I never used a hyphen
to indicate 'no hours'. Maybe it was a 'fix' in this new version.
--
Si (PLO)
#32955. Ego Sow Whir Den? ¶
Auxiliary Information:
• LibreOffice 3.4.0 OOO340m1 (Build:12)
• Windows XP Pro 5.1.2600 Service Pack 3
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