MQL4 Reference 
Date & Time functions TimeDay
| int TimeDay( |
datetime date) |
Returns day of month (1 - 31) for the specified date.
Parameters:
| date |
- |
Datetime as number of seconds elapsed since midnight (00:00:00), January 1, 1970. |
Sample:
int day=TimeDay(D'2003.12.31');
// day is 31
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