SD Sharma's opinion seems to be correct. This opinion is also supported by Shri M. Kunhikrishnan, Vice President of AIIEA.
As per LIC rules, period of training is not counted for calculating service. This rule has been since changed and period of training is also taken into account for reckoning service period (QFS) now. When pension was introduced in the year 1995, there were thus two groups of employees - employees whose period of training is not reckoned and (2) employees whose training period is reckoned for QFS as per changed rules. Shri Nair belonged to the former group of employees whose training period is not reckoned for QFS. He joined the service of the Corporation in Feb. 1991 and his probation actually commenced only in May 1991 (and probation completed in August 1991). So for all practical and QFS purposes, Shri Nair is deemed to have commenced his service only from the date of probation in May 1991. In the result, the period of service of the employee for QFS is 21 years, 5 months and 29 days which is rightly calculated by the Corporation as 22 years. -Ed.