<% Root.sys_minMemberSince %>
macro renders an input type text for editing the system-timestamp that allows users who have registered before it to create a site

Sourcecode in Root/sysmgr_macros.js:
1:   function sys_minMemberSince_macro(param) {
2:      // this macro is allowed just for sysadmins
3:      if (!session.user.sysadmin)
4:         return;
5:      if (param.as == "editor") {
6:         if (this.sys_minMemberSince)
7:            param.value = formatTimestamp(this.sys_minMemberSince, "yyyy-MM-dd HH:mm");
8:         param.name = "sys_minMemberSince";
9:         Html.input(param);
10:     } else
11:        res.write(this.sys_minMemberSince);
12:     return;
13:  }