# Frustrated: Found formula for calculating time here in the community

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So i found this formula and it is giving me #unparseable. Not sure what I'm doing wrong:

=INT(SUM@row)+":"+IF((SUM@row - INT(SUM@row))*60<10,"0")+(SUM@row - INT(SUM@row))*60

I have 3 columns:

Start End Total Hours

08:00 13:00

I'm using military time and I need to calculate total hours.

Please let me know what I'm doing incorrectly.

Thanks!😕

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You need to create a column [sum] with this formula in it:

=((VALUE(LEFT([End Time]@row, FIND(":", [End Time]@row) - 1)) + VALUE(RIGHT([End Time]@row, 2)) / 60) + ([End Date]@row - [Start Date]@row) * 24) - (VALUE(LEFT([Start Time]@row, FIND(":", [Start Time]@row) - 1)) + VALUE(RIGHT([Start Time]@row, 2)) / 60)

Then the formula you posted should work in your [total hours] column.

Glad you found @Paul Newcome 's time post. It's the best reference to help with time calculation. He is the wizard.

Work?

Mark

I'm grateful for your "Vote Up" or "Insightful". Thank you for contributing to the Community.

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You need to create a column [sum] with this formula in it:

=((VALUE(LEFT([End Time]@row, FIND(":", [End Time]@row) - 1)) + VALUE(RIGHT([End Time]@row, 2)) / 60) + ([End Date]@row - [Start Date]@row) * 24) - (VALUE(LEFT([Start Time]@row, FIND(":", [Start Time]@row) - 1)) + VALUE(RIGHT([Start Time]@row, 2)) / 60)

Then the formula you posted should work in your [total hours] column.

Glad you found @Paul Newcome 's time post. It's the best reference to help with time calculation. He is the wizard.

Work?

Mark

I'm grateful for your "Vote Up" or "Insightful". Thank you for contributing to the Community.

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Not sure what I did but I'm still not having any luck.

I'm sharing my test sheet with you:

https://app.smartsheet.com/b/publish?EQBCT=c48dd80e253243e0b9a46a4b0b97d58b

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Can you copy/paste the exact formula from the Sum column to here?

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Sure, I just copied and pasted the formula you dropped above:

=((VALUE(LEFT([End Time]@row, FIND(":", [End Time]@row) - 1)) + VALUE(RIGHT([End Time]@row, 2)) / 60) + ([End Date]@row - [Start Date]@row) * 24) - (VALUE(LEFT([Start Time]@row, FIND(":", [Start Time]@row) - 1)) + VALUE(RIGHT([Start Time]@row, 2)) / 60)

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and here's my formula for Total Hours:

=INT(Sum@row) + ":" + IF((Sum@row - INT(Sum@row)) * 60 < 10, "0") + (Sum@row - INT(Sum@row)) * 60

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ooh shoot it worked. I just needed to refresh my page. so sorry and thank you for your help. It's exactly what I needed. 🤗

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Happy to help. 👍️

Sometimes when copy/pasting a formula, you will need to refresh the sheet to get it to read the column names properly.

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Another question....while the 2 formulas are great for 1 day events, how should I write the formula for an event that spans multiple days, such as the case below, which is a 2 day event? I'm trying to not have to enter the event in twice to reflect this. My Total Hours is not showing a realistic picture. Total hours should be 24 since the event spans 2 days at 12 hours each day. This is such a complex formula, there is no way I could have figured this out.

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The way the formulas are currently written is that you have the start date/time and the end date/time with the difference between and not necessarily the duration multiplied by the number of days.

Will you have any end times that will be earlier than the start time such as starting at 9:00pm and ending at 1:00am?

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