Days of the week der
Always 100% of the 8 days of the week we counted take der.
All days of the week are masculine, like der Tag.
der Donnerstag
It's der Donnerstag. Donnerstag is masculine, plural die Donnerstage.
Am Donnerstag ist das Meeting.
On Thursday is the meeting.
Always 100% of the 8 days of the week we counted take der.
All days of the week are masculine, like der Tag.
Donnerstag der
The last part decides the article: der Tag, so der Donnerstag.