How to get the start date of the week for the given date in Salesforce

 If your trying to know the starting date of the week for the given date in salesforce please use the below 2 formats.

Using the Formula Fields:

The return type of the formula is date.

(Yourdatefield__c- MOD(Yourdatefield__c- DATE(1900, 1, 7), 7))

Using the Apex:

In case of apex we can use the salesforce in built date function called toStartofWeek() which returns the start date of week basis on the user locale.

• Sunday will be treated as US locale
• Monday in case of European locale

Date startWeek = Yourdatefield__c.toStartofWeek();

In my case given date is 20th Friday and start of the week will returns as 15th on Sunday

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Hope this helps you..Enjoy..!