error occurs when an observation is taken exactly at midnight UTC (00:00)....

error occurs when an observation is taken exactly at midnight UTC (00:00). This causes a problem to calculate the n value because hr and mi variables are empty. I made a quick fix by setting n value to 24 if an observation is taken at midnight.

da/stilt/stilt.co2.simu.2015.Sep.bc.r

@@ -556,12 +556,21 @@ flog.info('eventids: %s',eventids[mm], name='logger.b')  #June 23
      hr=substring(dd,12,13)
      mi=substring(dd,15,16)
 
+     flog.info('dd: %s, length dd: %s,hr: %s, mi: %s',dd,length(dd),hr,mi,name='logger.b')
+
      n = 24-floor(as.numeric(hr) + as.numeric(mi)/60)
+     if (nchar(dd,type='width') ==10)
+         {
+         n=24
+         flog.info('No hr and mi, set n to 24',name='logger.b')
+         }
+
      print("XXXn")
      print(n)
      datevalid=dateall[1]+0.5*3600-(0:(ntimes-1))*3600
      #ixflux=(1:ntimes)[(datevalid<=xx)][1:endtime]   #time backward
      #ixflux=(1:ntimes)[(datevalid<=xx)][1:(endtime+n)]
+     flog.info('n: %s, endtime: %s',n,endtime,name='logger.b')
      ixflux <-array(n:(endtime+n-1),dim=c(240))
 
     flog.info('ixflux endtime: %s,%s,%s',endtime,n,as.numeric(hr)+(as.numeric(hr)/60),name='logger.b')