Enter search, click on Search Tools to see Any Time
Custom range allows more flexibility
Click on Any Time for drop down menu of choices
Date search is based on date/time of update to a website. Google does not rank by date, so older webpages will appear in search results. Date search can be combined with Site Search (.gov, .edu, etc.--see earlier post)
I'm wearing my librarian hat today. Here's an update to an earlier post about limiting Google searches by date. The examples pictured are research oriented, but authors may want to use this trick to google themselves.