Multiplying by 86400 will work for both. If days are included, 1 day = 86400
seconds, so your math still works out.

Note that you could also just use a custom format of:
[s]
--
Best Regards,

Luke M
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"Greg" wrote:

I need to change some data to seconds. One of the problems is that some of
the data in the column is a subtotal, so the data is dd:hh:mm:ss where some
of it is hh:mm:ss.

Is there one formula that I can use as part of others (IF, SUMPRODUCT, etc.)
that coverts both dd:hh:mm:ss and hh:mm:ss to seconds?

I currently just multiply hh:mm:ss by 86400 to convert it to seconds.

TIA,
Greg