convert the times to days so the formula would be
=SUM(A1:A2)/86400
assuming your values are in cells A1 and A2 then apply your formatting

"keri" wrote in message
ups.com...
: The below are values in seconds and milliseconds.
:
: 28.921
: 36.432
:
: If excel adds these values I get 65.353 If I change the format to
: mm:ss.000 I get 28:19.200
:
: I need to get 1:05.353. (ie 1 min and 5 secs etc) as these cells are
: used in a formula. Does anyoe have any suggestions as I am stuck on my
: sheet until I solve this.
:
: Ps. I looked at len and tried some code that if the len < 6 then the
: value was "00:" & cell.value but this didn't work - possibly due to my
: code - but I was getting a decimal number in the cell.
: