Batch compress .avi files with ffmpeg which contain previous date in their name

im trying to manage CCTV footage, and im trying to batch compress them with ffmpeg

So far i managed to come up with this command

ffmpeg -i "0515 210004.mp4" -b 200000  output.avi

But i need to do them all at once, but exclude the current date

So if today is 16.05, in my folder i have

"0515 210004.mp4"
"0515 220004.mp4"
"0515 230004.mp4"
"0516 000004.mp4"
"0516 010004.mp4"

And so on

I only need to convert those containing 0515, and everyday that number should increment, so on 17.05 i will need it to convert all the files with 0516 in them.

There are also sometimes files that will have _1 in them, like "0515 180004_1.mp4"

(The 004 at the end is always there)

And i also need it to output it with the exact same name.

I see something like this

for %%A IN (*.mp4) DO ffmpeg -i "contains "%date% - 1day"" -b 200000 "oldfilename.avi"

I understand that this wont work, but lets call it my pseudo code

Do you have any ideas how i can accomplish my task?