# Trending date formulas across new year

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I would like to create a summary formula that automatically updates every week for work completed the previous week.

I have a date column that indicates completion date

I have a helper column that assigns a week number using WEEKNUMBER(date) called "Week Completed"

I have a summary formula as follows:

=COUNTIF([Week Completed]:[Week Completed],(@cell=WEEKNUMBER(TODAY())-1))

Everything worked until this week. Since 52 (the last week of the year) does not equal 1-1 (This week minus 1), I get no results.

Is there another way to right a formula for "last week" or "2 weeks ago" that will survive the new year reset?

Thanks for the help.

## Best Answer

• Employee Admin
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Hi @AFlint

You can add in an IF statement to check Today's Week. If Today's Week is 1, then instead of -1, we can look for week 52 specifically.

Try this:

=COUNTIF([Week Completed]:[Week Completed], IF(WEEKNUMBER(TODAY()) = 1, 52, (WEEKNUMBER(TODAY()) - 1)))

Cheers,

Genevieve

## Answers

• Employee Admin
Answer ✓
Options

Hi @AFlint

You can add in an IF statement to check Today's Week. If Today's Week is 1, then instead of -1, we can look for week 52 specifically.

Try this:

=COUNTIF([Week Completed]:[Week Completed], IF(WEEKNUMBER(TODAY()) = 1, 52, (WEEKNUMBER(TODAY()) - 1)))

Cheers,

Genevieve

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