DOW is 0-based?

Is there a rational reason why Day of the Week is 0-based, i.e. Sunday
(0) to Saturday (6) instead of the more intuitive Sunday (1) to Saturday
(7)?

    SELECT date_part('dow', current_date);

https://www.postgresql.org/docs/current/static/functions-datetime.html

Thanks,

Igal Sapir
Lucee Core Developer
Lucee.org <http://lucee.org/>