Is there a canon precedent for a phrase like "The day on which xy happened"? Like in "remember the day we first met". {maqIHbogh jaj} sounds wrong.
The only thing that came to my mind was from the Drinking song, but I think that one is not considered a best example, is it?
{jaj qeylIS molor mIgh Hoghchu'qu'}
"The day on which Khaless" killed evil Molor.
The Klingon Way, p. 177: wa' jaj 'etlh 'uchchoHlaH
tlhIngan puqloD; jajvetlh loD nen moj The son of a
Klingon is a man the day he can first hold a blade.
-- SuStel http://trimboli.name