How can i know the Export Advisors works with which time frame? 15min, 1hr, or 4hr timeframe?

 
the only way is to test it in the different time frames with optimization. Good luck
 
Thanks for 2 floors.

more about:

int Period( ) Returns the amount of minutes determining the used period (chart timeframe).

Print("Period is ", Period());

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Constant Value Description
PERIOD_M111 minute.
PERIOD_M555 minutes.
PERIOD_M151515 minutes.
PERIOD_M303030 minutes.
PERIOD_H1601 hour.
PERIOD_H42404 hour.
PERIOD_D11440Daily.
PERIOD_W110080Weekly.
PERIOD_MN143200Monthly.
0 (zero)0Timeframe used on the chart.