Today is Thursday. 

Yesterday was Wednesday.

Tomorrow will be Friday. 

or

Tomorrow is going to be Friday. 

Monday   Tuesday   Wednesday    Thursday    Friday    Saturday   Sunday

1st             2nd               3rd                  4th               5th           6th            7th 

Saturday and Sunday are days off meaning we don't work on these days.  I have the weekends off means I dont' work on the weekends. 

at the weekends - British  English

on the weekends - American English