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End of Life Ruby 3.2 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →

instance method

OpenSSL::X509::Certificate#not_before

cert.not_before => time
No documentation available
See also #not_before= #not_after= #not_after #pretty_print also in 4.1 · 4.0 · 3.4 · 3.3 · 3.1 · 3.0