Google Spreadsheet comparison using TIME function for 10:40:00 fails -


i'm having problem when comparing cells value 10:40:00 result of spreadsheet function time(10,40,0)

a series of comparisons shows values 8:40 10:39:59 , 10:40:01 13:40:00 compare correctly 10:40:00 incorrectly returns false the comparison.

am missing or bug?

i've played around spreadsheet , think i've found reason. has got bug (or @ least inconsistency in reading time literals). take @ following chart, shows time entered literal, value parsed this, , value parsed =time():

 value       literal                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 precision 15 decimal points, reason value 10:40:00 rounded 1 direction when parsed out of literal, , other direction when calculated =time().

interestingly enough, value calculated =time(10,40,0) seems incorrect one, 10:40:00 repeating decimal formula, should rounded down.

in event, understanding above, can compare 2 values using epsilon of 1e-15 (which happens 1 unit of magnitude smaller 1 nanosecond of resolution - 1 nanosecond 1.15741e-14). therefore if use following comparison works:

=abs(a7-time(10,40,0))<1e-15

-

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