I need help with a Google spreadsheet formula. This is what I'm trying to do:

Highlight the cells in “Conditional Formatting” where the time spent between 2 cells is more than 60min. In this case the B cell should be highlighted because the activity stopped for more than an hour.

activity stopped for more than an hour

Which formula to use? I try to change time format to number and compare between the cells but no success. Any idea please?

  • All the time is for the same day, the B is the 11:59:00 The downtime between 10:11:32 and 11:59:00 is more than 60 min so the cell 11:59:00 should be highlighted. Thanks – La_dh Jun 28 '17 at 12:34

To avoid the possibility of conflicting rules, clear all conditional formatting from ColumnA (assumed because OP won't say where the data is), select it and apply a Custom formula is of:


Select your format and Done.

For your locale you might need ; rather than ,.

AND (used here to address blank cells).

With one day being one unit to Google Sheets, 1/24 is one hour.

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  • That is very nice, thanks a lot! I was playing with it and let me ask few things more, it's not working when the midnight is passed. 0:35:01 22:02:42 (the 0:35:01 is not highlighted.) Any way to fix it ? – La_dh Jun 28 '17 at 15:46
  • ok, i will separate from 0:00 thanks! :) – La_dh Jun 28 '17 at 15:58
  • Can i add a period of time like 1/24 - 2/24 ? What i want is to mark with different color the downtimes between 1-2 hours. – La_dh Jun 28 '17 at 16:11
  • Downtime 1-2hours yellow, downtime 2-3hours red. Something like =and(A2<>"",A1>=1/24+A2) add new formula =and(A2<>"",A1>=2/24+A2) with different color. Only highligts yellow color. – La_dh Jun 28 '17 at 16:50
  • It seems ok but no color change, yellow remains yellow more than 1hour =and(A2<>"",A1>=1/24+A2) more than 2 hours : =and(A2<>"",A1>=2/24+A2) no highlights the cells to red (stay on yellow) where 2hours past. Any idea? thank you – La_dh Jun 28 '17 at 17:42

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