Assuming you mean seconds in the day
NUM_SECONDS_PER_DAY = 86400.0;
timeStrings = {'14:54:25';'14:54:25';'14:54:25';'14:54:26';'14:54:26'};
timeFractionalDays = datenum(timeStrings);
timeDayFraction = mod(timeFractionalDays,1);
timeInSeconds = timeDayFraction .* NUM_SECONDS_PER_DAY
This produces the result
timeInSeconds =
1.0e+04 *
5.3665
5.3665
5.3665
5.3666
5.3666
Best Answer