With DateDiff, you can determine the difference between two dates. This lets you see how long it's been since someone last logged in and much more.
The format of the DateDiff function is
DateDiff(code, date1, date2)
Code comes from the table below and indicates what unit of time you are wanting the difference measured in:
|y||Day of year|
|ww||Week of year|
The two dates are the dates which you will be comparing to each other
So to take today's date, a "Last Logon" date and see how many days it's been since your user logged onto your site, you would use:
DateDiff("d", LastLogon, Now())
Date and Time Functions
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