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Each measurement is taken to represent an interval of duration equal
to the sampling interval (In this data set, the sampling interval is
10 seconds). This attribute represents the
time of day of the beginning of the interval represented by
the first measurement in the aggregation.
Times are derived from the volunteers watch, and are
considered to be accurate within a couple of minutes.
A positive integer presented as HHMMSS, where HH represents
the hour of the day (in 24-hour time), MM represents the
minute within the hour, and SS represents the second within