I use Gmail every day and just found this page with amazingly useful search operators. Have a look below. It is really helpful even for doing things like finding emails before a certain date still in my inbox and then archiving them.
https://support.google.com/mail/answer/7190?hl=en
My search ended up being: “in:inbox before:2016/01/01”
Just type the above without the quotation marks in to the search box in Gmail and see what happens. More search operators below.
Search operators you can use with Gmail – Gmail Helphttps://support.google.com/mail/answer/7190?hl=enSearch operators you can use with GmailYou can use words or symbols called search operators to filter your Gmail search results. You can also combine operators to filter your…