What is "clock"? as far I know there's no "clock" function in MQL4.
You can try this
Code:
if(TimeHour(TimeCurrent())==7)
{
if(TimeMinute(TimeCurrent())==15) B== 1;
if(TimeMinute(TimeCurrent())==30) B== 2;
if(TimeMinute(TimeCurrent())==45) B== 3;
}
if(TimeHour(TimeCurrent())==8)
{
if(TimeMinute(TimeCurrent())==0) B== 4;
if(TimeMinute(TimeCurrent())==15) B== 5;
if(TimeMinute(TimeCurrent())==30) B== 6;
}