Google Product Forums
Re: Can I restrict Google from crawling my site on a specific day of the week?
Jan 10, 2010 1:37 PM
Posted in group:
Crawling, indexing & ranking :
Sorry - but did the info above (noted as Best Answer) not make it clear for you?
You send a 503 response on the days/dates/times you wish to avoid being indexed.
Whether you do this at the Server level, or via a script...
Whether you do this Manually or in an automated fasion...
... is down to you.