I have some old silver certificates. This was the deadline set by the Congress. Since that date, there has been no obligation to issue silver in any form in exchange for these certificates. You may be interested to know that the Congress took this action because there were approximately three million silver dollars remaining in the Treasury Department's vaults. These coins had high numismatic values, and there was no way to make an equitable distribution of them among the many people holding silver certificates.
Silver certificates are still legal tender and do still circulate at their face value.
Depending upon the age and condition of the certificates, however, they may have a numismatic value to collectors and dealers. I have some old gold certificates and would like to trade them in for gold. Gold certificates were withdrawn from circulation along with all gold coins and gold bullion as required by the Gold Reserve Act of 1934 . It was then illegal to hold gold certificates. A person lawfully holding United States coins and currency may present the coins for currency . . .