Python
import datetime

def get_weekday(date_string):

  year = int(date_string[0:4])
  month = int(date_string[5:7])
  day = int(date_string[8:10])
  
  date = datetime.datetime(year, month, day)
  return date.strftime("%A")
    
mydate = '2026-01-01'
print(mydate + ' is a ' + get_weekday(mydate))

rightnow = str(datetime.datetime.now())[0:10]
print('Today is a ' + get_weekday(rightnow))
2026-01-01 is a Thursday
Today is a Thursday