There is another minor incompatibility:
* The timestamp() function is no longer available. Use timestamp
'string' instead, or CAST.
In OpenACS 4.x this occurs only once, in the calendar package - patch is in the sdm.
In OpenACS 3.x there seems to be also one occurence of this that should be changed, here: www/education/class/admin/task-add-3.tcl - but I did that search on an old checkout and don't know if that file is still there, or what this education module does at all, so did not change it.
