over the years i learnt that being late or tardy isnt a joke. if you dont have to sign into a phone or voip, you can get away with 10 mins like everyday but usually everywhere takes lates seriously. you can be early everyday but the one day your late your gonna get in shyt. i got fired from tim hortons helpdesk for this very reason. time is money, especially in the corporate world. you cant be costing nikkas their bread plus it just looks bad.
Eh, the Helpdesk is probably one of the few positions in IT where time is strict. Other positions are normally pretty flexible depending upon the company. Like the guy on-call fixing a server issue at 3am, isn't going to be expected to work "on-time". But helpdesk for sure, you better stick to that schedule.