Those are three different things. When your clearance is adjudicated is one date. SCI indoctrination is separate and will have a date of its own. You can be briefed in and out of SCI based on need-to-know with no impact on your underlying clearance. Polygraph is also separate, and occurs independently of other accesses.

I share 2 dates: investigation completed and adjudication. You should have this information somewhere.

Is the date you got a clearance the date you received the ts email , the day you were briefed for sci or the date you took a polygraph?