Golang：https证书有效期检测

package main
import (
  "crypto/tls"
  "fmt"
)
func main() {
  conn, _ := tls.Dial("tcp", "www.baidu.com:443", nil)
  cert := conn.ConnectionState().PeerCertificates[0]
  // 时间信息
  fmt.Printf("NotBefore: %v\n", cert.NotBefore)
  // NotBefore: 2022-07-05 05:16:02 +0000 UTC
  fmt.Printf("NotAfter: %v\n", cert.NotAfter)
  // NotAfter: 2023-08-06 05:16:01 +0000 UTC
  // 其他信息
  fmt.Printf("IPAddresses: %v\n", cert.IPAddresses)
  // IPAddresses: []
  fmt.Printf("IPAddresses: %v\n", conn.RemoteAddr())
  // IPAddresses: 220.181.38.150:443
  fmt.Printf("Version: %v\n", cert.Version)
  fmt.Printf("SerialNumber: %v\n", cert.SerialNumber)
  fmt.Printf("Issuer: %v\n", cert.Issuer)
  fmt.Printf("Subject: %v\n", cert.Subject)
}