To delete all lines between lines that begin with a date in the DD-MMM-YYYY format, try a wildcard Find/Replace, where:
Find = [^13^l]*([^13^l][0-9]{1,2}-[JASOND][abceglnoprtuvy]{2}-[0-9]{4})
Replace = \1

__________________
Cheers,
Paul Edstein
[Fmr MS MVP - Word]