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The first output value is incorrectly omitted from the OUT= data set
whenever all of the following conditions hold:
  1. The TO= option specifies either an interval longer than one day
(if the ID variable is a SAS date variable) or an interval longer than
one second (if the ID variable is a SAS datetime variable).
  2. The FROM= option is not specified.
  3. The interval between the first two observations in the input data
is either one day (if the ID variable is a SAS date variable) or one
second (if the ID variable is a SAS datetime variable).

To circumvent the problem, use PROC EXPAND to convert to a frequency at
least as high as the interval between the first two input observations.
Then invoke PROC EXPAND again to convert the higher frequency series to
the desired TO= frequency.

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