Formula to calculate time

Earlier I found the following formula in this forum to calculate time, as follows:

Let's say it is row 1 and the columns are:

StartTime1

EndTime1

=VALUE(LEFT(EndTime1, (FIND(":", EndTime1) - 1))) - VALUE(LEFT(StartTime1, (FIND(":", StartTime1) - 1))) + (VALUE(RIGHT(EndTime1, (FIND(":", EndTime1) - 1))) - VALUE(RIGHT(StartTime1, (FIND(":", StartTime1) - 1)))) / 60

However, I realised that for time before 8:00, it couldn't count accurately. (Refer to picture below, highlighted in red)

Anyone has more accurate formula to calculate time?

Thanks.

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Accepted answers

Vivien Chong

HI @Paul Newcome

Thanks for your prompt reply.

I tried to duplicate your formula, however it return "invalid operation".

What could have gone wrong?

Paul Newcome

You have a misplaced closing parenthesis.

You should have one after the second [End Time]@row and there is one too many at the end of the formula.

=((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)

All comments

Paul Newcome

@Vivien Chong

Hey there. I recently helped with a similar solution. Take a look at THIS THREAD and feel free to let me know if you need help adapting it to suit your needs.

Vivien Chong

HI @Paul Newcome

Thanks for your prompt reply.

I tried to duplicate your formula, however it return "invalid operation".

What could have gone wrong?

Paul Newcome

You have a misplaced closing parenthesis.

You should have one after the second [End Time]@row and there is one too many at the end of the formula.

Vivien Chong

@Paul Newcome

You are the best!

No wonder at the end of the formula it will automatically add another closing parenthesis.

Problem sol

Paul Newcome

Happy to help! 👍️

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