Or in mosque on Friday
In Riyadh we used to call it Saudi Sunday...but then nothing remains the same in that part of the world so in June they changed the weekend. From BBC this:
Saudi Arabia switches start of weekend from Thursday to Friday. A royal decree takes effect June 2013.
After Oman switched to a Friday-Saturday weekend, Saudi Arabia was the only country left among the six-member Gulf Co-operation Council to persist with the old format.
A statement carried by the the national Saudi news agency SPA said the change, decreed by King Abdullah, was “for the sake of putting an end to the negative effects and the lost economic opportunities consistently associated with variation based on work days between local departments, ministries and institutions and the regional and international counterparts.”
It will mean that Saudi businesses will now have four working days overlapping with Western and regional businesses rather than three, making it easier to trade.
Friday remains a holiday in Muslim countries because it is a holy day set aside for communal prayer.