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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
date 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 YYYYMMDD, where YYYY
represents the year, MM represents the month within the
year, and DD represents the day within the month.