The arguments --starttime and --endtime should be of the format YYYY-MM-DDThh:mm:ssZ, where YYYY is the year, MM the month, and DD the day. Likewise, hh, mm and ss is the hour, minutes, and seconds respectively. Notice the separator, T, and Z which must be included. It should also be noted that the time is given in UTC. Local timezone corrections should, therefore, be made accordingly.