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Letter of introduction from college graduates (including employer, reporting time to employer and starting salary) can be used as the basis for calculating the length?

The letter of introduction of college graduates (including indicating the employment unit, the time of reporting to the employment unit and the starting salary) cannot be used as the basis for calculating the length of service. The length of service of college graduates should be calculated from the date of formal registration in the work unit. Because of the salary increase involving social security issues, some units deliberately delayed the registration time of graduates, which saved the unit a lot.