I know very little to nothing about button dates.
If you mean mid 1800's than yes, but they could date back to the early 1800's.
Your first one, the green one. looks like I see and upside down eagle that they used back in the revolutionary war.
The second one I can't make out much detail so no guess there. maybe just a flat button with crud build up.
But what do I know... Just a WAG