Calendar of Harptos
Calendar Notes | Current year: 1941 DR
1/Hammer = January, 12/Nightal = December. each month is 30 days with special days in between certain months to make each year 365 days. For example, y'all celebrating Highharvest Tide in today's session means when you wake up tomorrow it will be Marpenoth, day 1, aka October 1st
you need not really DO anything with information except that now time is passing is a very real, quantifiable way
furthermore, if you have dates that may be important to you/your character/your worldbuiding etc. you can now use this as a reference.