Source

django-weekday-field / weekday_field / utils.py

DAY_CHOICES = (
    (0, "Monday"),
    (1, "Tuesday"),
    (2, "Wednesday"),
    (3, "Thursday"),
    (4, "Friday"),
    (5, "Saturday"),
    (6, "Sunday")
)

BITWISE_DAY_CHOICES = (
    (1, "S","Sunday"),
    (2, "M","Monday"),
    (4, "T","Tuesday"),
    (8, "W","Wednesday"),
    (16, "Th","Thursday"),
    (32, "F","Friday"),
    (64, "Sa","Saturday"),
)