How to change date format in Altium schematic title block?
There is no way from Altium Designer. Altium just uses the Regional settings in Windows to determine how to display  =CurrentDate in the title block. So, change it in Windows:
Start-&gt;Control Panel-&gt;Clock, Language and Region-&gt;Change the date, time, or number format
You may have to type the desired format in rather than just selecting from the drop-down box.