Going by the language of Rule 19(1)(a), irrespective of the date of joining of the Society in the Pension Scheme-1994, the length of service of an employee would be reckoned from the date of the employee joining the contributory fund. Thus, the moment the scheme was implemented and the moment the Society joined the scheme, the length of service of the petitioner would be reckoned based on the status of the length of service of the petitioner as on 14.3.1995, the date on which the Pension Scheme-1995 was implemented. After implementation of the Pension Scheme-1994, any employee or any employer cannot unilaterally change the commencement of length of service under the Pension Scheme-1994 to an anterior date by altering joining date of contributory fund, as this would militate statutory provision. The statute would have an overriding effect and would prevail all actions of the individual. Once the statute fixes a date, fixing the date of joining the contributory fund as the date of joining Pension Scheme-1994, that date comes into force when the Pension Scheme-1994 is implemented. In this case it is clear that the date of joining has been altered to an anterior