[amibroker] reg time frame........

[WildWoman4915]

hi all,
           i want to know how to change the time frame in amibroker........i 
need 10 to 10.15 as a 15 min bar in charts, but amibroker shows 9.55 to 10.10 
as a 15 min bar. so kindly give suggesition for this......

thanks,
gkramesh