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/usr/share/snmp/mib2c-data/syntax-DateAndTime-readme.m2i is in libsnmp-base 5.7.2~dfsg-8.1ubuntu3.

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  This column is a DataAndTime object. The local local variables year,
  month, day, hour, minues, seconds, deci_seconds, utc_offset_direction,
  utc_offset_hours and utc_offset_minutes should be set from the data
  context before the netsnmp_dateandtime_set_buf_from_vars function call.