Basically here we are asking why are you wanting to look at BCS data. This is because the approach used to access the data if you are interested in a particular time is different from that used if you are trying to find the occurrence of a particular type of event without any a priori knowledge of its occurrence.
If you are interested in a particular time interval, you have probably found out that there is an event from the book of BCS Ca XIX light curves, SA plots, PLOTY plots, GOES light curves, the event lists, the occurrence of a flare flag or from something seen in another instrument. In this case, the way to proceed is to use YODAT or WBDA.