All time is considered a fraction of a day in Excel:
1 = one day, 24 hours
..5 = 12 hours
etc. down to 10 decimal places.
I haven't done the math, but is shouldn't be difficult.
And format to numbers. Be aware that the fractional part of now tracks the
part of a day. There are only 10 digits available for this because the first
5 digits are on the left of the decimal and they track the date.
Since the are 60*60*24 =86400 seconds in a day so Excel is limited to the
number of decimals it tracks accurately.
In mine (Excel 2003) the Excel Help for the SECONDS function says "Returns
the seconds of a time value. The second is given as an integer in the range
0 (zero) to 59.", so I wouldn't have expected to see milliseconds that way.
I don't think that function has changed significantly between versions, but
your Help should tell you.
Yes, the resolution of the NOW() function is one-hundredth of a second.
That's still a lot better than Control colon which works to one minute.
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