How well do you keep track of time?

I have often realized over the course of my life just how bad I am at keeping track of time in the long run.

I will often tell someone something that includes a time frame, only to later realize that I was wrong by a fairly large margin.

This is a little strange to admit, but I don’t even know the months of the year. I know its January February, something with an ‘M’ either may or march, then April, then blah blah blah December. I have managed to learn to speak 5 languages in my life, and am working on my 6th. I have learned how to program computers, and have managed to remember very long strings of numbers and other bits of info with ease, but try as I may, I have never been able to learn the months of the year.

This is something I dislike, as I find it makes me look like I tell lies, Ill tell someone I have been at a job for 6 months when I have really only worked there for 4 or almost worked there a full year, and get dates wrong all the time.

So I was wondering, how well do you keep track of time in the long run?

Also, if you are good at it, how do you achieve being good at it?

My short term is fine, if I tell someone I will be there at 5pm Ill be there by 4:50pm, but remembering and keeping track of how much time has passed in the long run is almost impossible for me.

Any advice?