问题
I'm having a problem when comparing cells with value 10:40:00 to the result of the spreadsheet function TIME(10,40,0)
A series of comparisons shows that values from 8:40 to 10:39:59 and from 10:40:01 to 13:40:00 compare correctly but 10:40:00 incorrectly returns FALSE for the comparison.
Am I missing something or is this a bug?
回答1:
I've played around with your spreadsheet and I think I've found the reason. This has got to be a bug (or at least an inconsistency in reading time literals). Take a look at the following chart, which shows the time entered as a literal, the value parsed from this, and the value parsed from =TIME():
value from literal from TIME(...) 08:40:00 0.3611111111111110000000 0.3611111111111110000000 09:40:00 0.4027777777777780000000 0.4027777777777780000000 10:30:00 0.4375000000000000000000 0.4375000000000000000000 10:39:00 0.4437500000000000000000 0.4437500000000000000000 10:39:59 0.4444328703703700000000 0.4444328703703700000000 10:40:00 0.4444444444444440000000 0.4444444444444450000000 10:40:01 0.4444560185185190000000 0.4444560185185190000000 10:41:00 0.4451388888888890000000 0.4451388888888890000000 10:50:00 0.4513888888888890000000 0.4513888888888890000000 11:40:00 0.4861111111111110000000 0.4861111111111110000000 12:40:00 0.5277777777777780000000 0.5277777777777780000000 13:40:00 0.5694444444444440000000 0.5694444444444440000000
Notice the precision is always 15 decimal points, but for some reason the value for 10:40:00 is rounded one direction when parsed out of a literal, and the other direction when calculated from =TIME().
Interestingly enough, the value calculated from =TIME(10,40,0) seems to be the incorrect one, as 10:40:00 is really the repeating decimal , which should be rounded down.
In any event, understanding the above, we can compare the two values using an epsilon of 1e-15 (which happens to be one unit of magnitude smaller than one nanosecond of resolution - one nanosecond is 1.15741e-14). Therefore if you use the following comparison it works:
=abs(A7-time(10,40,0))<1E-15
来源：https://stackoverflow.com/questions/30227850/google-spreadsheet-comparison-using-time-function-for-104000-fails