series with dsgetValueAtTime not correct value.

[jgr]

I used the function below to create a series with efsInternal to dsplay the volume at current time from the previous day. It comes out about 15 minutes early and the values seem to follow the previous day pattern but the are incorrect numerically.

Any explanation?

function prevdayvol() {
return dsLib.dsgetValueAtTime(getHour()+":"+getMinute(),1 ,volume());
}

jgr