Calling date_time time_input_facet directly

I have to parse a leading timestamp in a bunch of records, and I would like
to avoid having to copy each record into a stringstream just to parser the
timestamp. Does anyone know how to call the date_time time_input_facet
directly? I did something like the following:
char buffer[N];
typedef boost::date_time::time_input_facet
participants (1)
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Jeffery Cavallaro