[libreoffice-users] calculating time differences

Hi there

I need to calculate several videos duration having initial and final time
in hh:mm:ss.000 format. But even if such format is set as a custom one just
got a #VALUE! message.
Is possible to achieve that task or need to look for an alternative way to
find out?

Regards in advance and wish you all have a very nice 2013 beggining.

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