Last Update User (Search=>Filter=>Dates)
Use these fields to select waypoints based on the date that the waypoint was last manually updated. That is, any change made to the waypoint other than when you load a GPX/LOC/ZIP file into the database. By default, all waypoints are selected (on or before to today's date). Use the drop-down menu to select other date options. The second field allows you to choose the date to apply: the default is today's date. Click on the calendar icon
to display a calendar, or type a date directly into the field in the format of your system's date setting. GSAK displays a second calendar field if you choose "Between (inclusive)" on the drop-down menu.If you want to compare relative dates rather than absolute dates, then use the during options. For example, "Show me caches updated in the last 7 days"
If you want to compare to another date use the Compared to option.