 # How to round date differences to specific times?

Hi, I would like to calculate the halfway point between two date-time entries, but then I want as a result a time occurring between 8:00 and 20:00. So if the halfway point is outside this timeframe and before 2:00, it would round down to 20:00 the day before, after 2:00, it would round up to 8:00. How would I do this?

Screenshot 2020-11-25 120446.png

What about case "after `20:00`" - should it round down to `20:00` current day ?

Yes, sorry, anything after 20:00 on same day would also round to 20:00

Hello,

while waiting for a response to my comment, see the formula in column `I` of following sample file:
HalftimeByConditions.ods

Formula in column `I` reads (formatted here for better readability of the 4 conditions used)

``````=IFS(       MOD((\$B2+\$C2)/2;1)<2/24                         ;INT((\$B2+\$C2)/2)-4/24;
AND(MOD((\$B2+\$C2)/2;1)>2/24;MOD((\$B2+\$C2)/2;1)<8/24);INT((\$B2+\$C2)/2)+8/24;
MOD((\$B2+\$C2)/2;1)>20/24                        ;INT((\$B2+\$C2)/2)+20/24;
1                                             ;(\$B2+\$C2)/2)
``````

Note(s)

• Columns `D` through `H` are not required for the formula to work (only column `B` and `C` are used). I left em for the sake of understanding, how the formula works and for breakdown/testing purposes.
• If have implemented a condition, which sets >`20:00` to `20:00` (round down).
• Rounding to full hours is in column `J`

Hope that helps.

Awesome! This is exactly what I wanted to calculate. Thank you so much!