State Of Haryana vs Haryana Veterinary & A.H.T.S. ... on 19 September, 2000
"2........The question for consideration is whether the ad hoc
service rendered by them is to be included for the purpose of
calculating 8 or 18 years' service which is required for giving
them the higher scale of pay under the proficiency step-up
scheme for seniority etc. This question was considered by this
Court in the case of State of Haryana v. Haryana Veterinary &
AHTS Assn. [(2000) 8 SCC 4], in which a three-Judge Bench of
this Court held that the ad hoc service rendered by the
employees is not to be included for the purpose of calculating
8/18 years of service; only regular service is to be counted for
the purpose."