MQL4 Reference 
Date & Time functions TimeDayOfWeek
| int TimeDayOfWeek( |
datetime date) |
Returns the zero-based day of week (0 means Sunday,1,2,3,4,5,6) for the specified date.
Parameters:
| date |
- |
Datetime as number of seconds elapsed since midnight (00:00:00), January 1, 1970. |
Sample:
int weekday=TimeDayOfWeek(D'2004.11.2');
// day is 2 - Tuesday
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