I ended up using the custom MQL code block
0_1586030104543_03b5d4f6-259c-42bf-b5ab-45524e57c736-image.png
MqlDateTime str1,str2;
TimeToStruct(StrToTime(starttime),str1);
MqlDateTime hour1;
hour1.day = str1.day;
hour1.hour =str1.hour ;
hour1.min =0 ;
hour1.sec =00 ;
hr1= str1.hour;
MqlDateTime hour2;
hour2.hour =str1.hour+1 ;
hour2.min =0 ;
hour2.sec =00 ;
hr2=hour2.hour;
MqlDateTime hour3;
hour3.hour =str1.hour+2 ;
hour3.min =0 ;
hour3.sec =00 ;
hr3=hour3.hour;
MqlDateTime hour4;
hour4.hour =str1.hour+3 ;
hour4.min =0 ;
hour4.sec =00 ;
hr4=hour4.hour;