Not to be confused with "punctuation".,;"!?  Punctuality is more than just being on time.  It's also about respect.  Whether it's a lunch date, or a business appointment, being on time speaks volumes about how important you think your appointment/date is, versus how important you think you are.

If you are the person who is always late...  Chronically late;  irretrievably, unconscionably, inconceivably late, you need to make Being On Time a priority.

Set your watch ahead 15 minutes if you need to.  Or just leave 15 minutes earlier than you think you need to.  See what happens!  

If you know you won't be able to make the date/appointment/meeting/what-have-you, at least call your counterpart to let them know you won't be on time, so they are not stuck looking at their watch every five minutes, wondering if they got the date, time or place wrong.  They should not be penalized for being on time.  They should, actually, be rewarded!  So, as long as you're running late, stop off and pick up some chocolates for them!

Then, next time, when you're on time, you can get some chocolates for yourself too.