newbie: how to initialize DisplayString for a NOTIFICATION

If my trap is defined as follows, how to initialize certExpiry to a valid DisplayString?

certExpiry OBJECT-TYPE
    SYNTAX     DisplayString (SIZE (0..128))
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
        "This DisplayString objects' indicates the expiry date of the server certificate."
    ::= { certMib 6 }


certExpiryTrap NOTIFICATION-TYPE
     STATUS current
     VARIABLES { certExpiry }
     DESCRIPTION "Notify that the certificate will become expire soon."
     ::= { certMibTraps 1}



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