Database query, used by Gene to calculate [run start - first event] time differences...

select ds.runNumber,ds.firstEventTime,
  (ds.firstEventTime-rd.startRunTime),(rd.endRunTime-ds.lastEventTime)
  from runDescriptor as rd left join daqSummary as ds on ds.runNumber=rd.runNumber
  where rd.endRunTime>1e9 and ds.lastEventTime>1e9 and ds.firstEventTime>1e9;

Moved to protected page, because it is not recommended to use direct online database queries for anybody but online experts.