software

I import data representing telephone call duration from a csv file
ie
001:00:12
013:15:59
124:42:13
and want to sum it using SUM(A1:A3)

If I copy from the csv file and paste into Excel the format of the text
data remains untouched even if I have previously formatted cells A1gt;A3
as [h]:mm:ss

If I manually overtype the cells ie in A1 (eg type 1:0:12, and 13:15:59
and 124:42:13) the cells display correctly (except no leading zeros) and
the formula then starts to calculate correctly . In effect I am retyping
every cell value so that the formula calculates correctly. Any help very
much appreciated.--
JLettington------------------------------------------------------------------------
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