This comes from Techflock.  There are a bunch of tricks available in gmail for finding certain types of messages such as unread, those from a specific user, date, label, or those accompanied by attachments.

Enjoy!
There are a few keywords that you can use in the search box at the top of the page

from:
to:
subject:
label:
after:
before:
in:
is:
has:

For the above, you could provide the following options as below

from:

from: {email address}
from: {name}

to:

to : {email address}
to : {name}

subject:

subject: {subject}

after:

after: {date in any known format} – For example : March 25, 10/10/2006, etc

before:

before: {date in any known format} – For example : March 25, 10/10/2006, etc

in:

in: inbox (Searches Inbox)
in: chat (Searches Chat)
in: drafts (Searches Drafts)
in: spam (Searches spam)
in: trash (Searches Trash)
in: anywhere (Searches All the Mail including Trash & Spam)
is:

is: starred (Searches Starred Mail)
is: sent (Searches Sent Mail)
is:read (Searches Read Mail)
is:unread (Searches Unread Mail)

has:

has:attachment (Checks for mail with Attachment)

label:

label: {label_name} (Checks in mail with Label name)

Other general options include

{search_keyword} and – {search_keyword} which means search for {search_keyword} or doesn’t have {search_keyword} in your mail
Example:

Find all mail which was addressed to techflock before 19th Dec 2006 and After 1st November 2006 and has networking but not basic in the mail with IMP as label

Your search query would be

before:2006/12/19 after:2006/11/01 to:techflock label:IMP in:anywhere networking -basic