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# Re: [libreoffice-users] Calc date formulae

```On 12 Jun 2015 at 8:49, Gordon Burgess-Parker wrote:

Date sent:              Fri, 12 Jun 2015 08:49:35 +0100
From:                   Gordon Burgess-Parker <gordonbp@mail.com>
To:                     users@global.libreoffice.org
Subject:                Re: [libreoffice-users] Calc date formulae

```
```On 12/06/15 08:44, Dries Feys wrote:
```
```If the date to check is in B3, try the following formula:

=IF(WEEKDAY(B3)=1;B3-2;IF(WEEKDAY(B3)=7;B3-1;B3))

Don't forget to format the target cell as a date ;-)

Succes

```
```
```
```
Not sure why what I see in email sent isn't what I get on the list?
Column A has the date
Friday, June 12, 2015

Column B has the formula
=A1-(MOD(INT(A1),7)<2)*(MOD(INT(A1),7)+1)

Which uses the value of A1, Logical math then does if it is true that it is a
Saturday or Sunday, it will then subtract the 1 or 2 to get the previous Friday
Date.

Long ago, used a Zeller congruency formula to calculate day of week using
mod. 0 - sat 1-sun ...

Hopefully, this will show up correctly.

```
```Great! Brilliant! Thanks very much!

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