Section 23(1) in The U.P. Fire (Gazetted Officer) Services Rules, 1984
(1)Except as hereinafter provided, the seniority of persons in any category of posts shall be determined from the date of the order of substantive appointment and if two or more persons are appointed together, by the order in which their names are arranged in the appointment order :Provided that if the appointment order specifies a particular back date with effect from which a person is substantively appointed, that date, will be deemed to be the date of order of a substantive appointment and, in other cases it will mean the date of issue of the order :Provided further that, if more than one orders of appointment are issued in respect of any one selection the seniority shall be as mentioned in the combined order of appointment issued under sub-rule (3) of rule 19.
