What do you need this timestamp for? If you just want to use the timestamp in templates, then you can just convert it using GT::Date. You would use something like:
By default, it will output the date in yyyy-mm-dd format. If you want to change the format then the following should work:
The formats are described at the top of the file admin/GT/Date.pm and also in the admin => Setup => Dates.
Adrian
Code:
<%GT::Date::date_get($users_join_time)%>Code:
<%GT::Date::date_set_format("format goes here")%><%GT::Date::date_get($users_join_time)%>Adrian
