I have a Gmail account that it is only monitored Monday through Thursday.  I would like to set something up to automatically send a canned reply for emails received between Thursday afternoon and Monday morning informing the sender that the email will not be seen until Monday morning, and giving emergency contact information.  I don't think this can be done directly in Gmail right now.  (Vacation replies need to be manually turned on and off, and filters for canned email do not include any date/time options.) Can I set Gmail out of office replies for every week recurring? also suggests that this is was possible in Gmail, at least at the time of that question. Is there any work-around or way to do some simple coding to accomplish this?  I have a software development background, but I'm not aware of what (if any) options are available to the general public to extend Gmail.
Any way to send Gmail auto-response at certain times every week?
gmail;automation