Setting a Starting or Ending Date
Use this URL to restrict your search to a specific starting or ending date. For example, use a startdate parameter of 01/01/2000 to indicate that you want to search content starting with January 1, 2000. Use the enddate parameter to indicate that you only want to search content that is older than the date you specify.
URL Template
http://advance.lexis.com/api/search?{search-terms}&{collection}&{startdate|enddate}