Looking on the internet deeply has found these results:

on thursday is the most popular phrase on the web.

at thursday 1533,000 results on the web	on thursday 1222,000,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
What happens tonight and at Thursday night's elections will shape the next year of our lives here at ZBZ. If you look at Thursday's work, you'll see he had some impressive spikes in his brain activity. The deadline for tabling draft amendments and proposed modifications to Supplementary and Amending Budget No 3 for the financial year 2003 was fixed at Thursday, 3 July 2003 at 12.00. All on our forecast after our look at Thursday morning traffic. No. Everything stops at Thursday night.	I'm in the football team against Durrants on Thursday. I'm flying private to Chicago on Thursday for Botox. Just got the flights for next week on thursday. Let me mention briefly what happened on Thursday. David Petraeus is resigning on Thursday. Is it okay if I clean your pool on thursday instead of wednesday? The contempt hearing is on Thursday. It's Lucy's 21st birthday on thursday.

at thursday

1533,000 results on the web

on thursday

1222,000,000 results on the web

More popular!

What happens tonight and at Thursday night's elections will shape the next year of our lives here at ZBZ.
If you look at Thursday's work, you'll see he had some impressive spikes in his brain activity.
The deadline for tabling draft amendments and proposed modifications to Supplementary and Amending Budget No 3 for the financial year 2003 was fixed at Thursday, 3 July 2003 at 12.00.
All on our forecast after our look at Thursday morning traffic.
No. Everything stops at Thursday night.