Hello All, I'm having an issue with the Using Formula Field Challenge . I'm using the formula that Vivek provided to a solved question yesterday " TODAY()  -    DATEVALUE(LastModifiedDate) " but its been met with this error below when its been checked by the challenge " 

Challenge not yet complete... here's what's wrong: 
The 'Days_Since_Last_Update__c' formula field did not return the correct number of days between an Account’s Last Activity Date and today

Can anyone assist???