timedayofweek()

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Returns the zero-based day of week (0 means Sunday,1,2,3,4,5,6) of the specified unix time.
int timedayofweek(long timeb // unix time
);
Parameters
date
[in] long as number of seconds elapsed since midnight (00:00:00), January 1, 1970.
Returned value
The zero-based day of week (0 means Sunday,1,2,3,4,5,6) of the specified date.
Example:

int weekday=timedayofweek(timeb(0)); // day is 2 - Tuesday