Bill segments produced for an obligation have two time periods:
The bill segment period. The bill segment period defines the entire period of time covered by a bill segment's charges.
The billable period. The billable period defines the period of time used to calculate the number of days for daily charges.
The billable period almost always starts one day after the bill segment period. The billable period always ends on the bill segment's end date. For example, a bill segment period that spans 5-Jan-2002 through 6-Feb-2002 will almost always have a corresponding billable period of 6-Jan-2002 through 6-Feb-2002. The reason that the start dates don't match is because a bill segment's start date equals the end date of the prior bill segment (i.e., the start date was already counted in the previous bill segment's period and we don't want to count it twice).
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