The contents of the Summons are specified in CCP 412.20. A date is not prescribed and an erroneous date on a summons would not invalidate it. (Hibernia Savings and Loan Society v. Churchill, 128 C 633) Likewise, the issuing clerk’s name is not required. Although CCP 153 requires the seal of the court to appear on a summons, the clerk shall retain the original (CCP 412.10).