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Preview Ruby 4.1 is a preview. It can change before the final release. Switch to Ruby 4.0 →

instance method

OpenSSL::X509::Certificate#not_before=

(::Time) -> ::Time
cert.not_before = time => time
No documentation available
See also #not_before #pretty_print #not_after= #public_key also in 4.0 · 3.4 · 3.3 · 3.2 · 3.1 · 3.0