Hey Priyanky, all though most of the suggestions are the most apt ones if they can be followed, but i feel they arent practically possible. Changing office policies would be not a nights work. I feel u shud talk to their deptt. manager and try to find out why is it tht his/her deptt.s ppl do this and tht too on a regular basis. You can then issue circulars/memos to the employees stating tht office timings are 10 n they r expected to be in the office by then. you can keep a tab on this and conduct a daily/weekly review reporting the employees as well as their seniors bout the defaulters.
All the best TC
All the best TC