An error has been discovered in reporting the time step when using a diffuse time-series file (DTSF). The reported time offset depends on the initial hour of each event. If the starting hour is zero then the offset is zero. Otherwise the offset depends on the starting hour. If the starting hour is 1, then the offset is 1 - 1/24.0 hours, which is slightly less than one hour. Thus the maximum offset in the reported time is one hour or less. It appears that this discrepancy has been present for some time. To prevent this bug, use a starting time of 0.0 when using a DTSF.