Secondly incorporate HODs of concerned department in making late coming policy
One day in a week upto 15 minutes late is acceptable.
Policy which involves whole company should be made and approved at director level where in all details -arrival departure, log in/out, leaving premises during working hrs, offs etc should be discussed and made aware to all and then enforced.
Employees can and do fall sick suddenly and some do make false excuses of sickness.
Whether Medical certificate is mandatory is again a policy decision,if some one is absent suddenly without notice.
Discuss and incorporate.
Enforcement of timings is a group effort of HR/HOD/employees together.Single handed changes will not be effective.
Disciplinary actions can be take for habitual latecomers,after enforcing policy for late coming,marking 1/2 day C/L or 1 day CL etc.
3rd November 2018 From India, Pune
5th November 2018
All the best.
6th November 2018 From India, Aizawl