How about using the range operator?

$ cat foolog 
TICKETHELP###,########,1234567###,2004,1,2,35.00###,2004-5-2 17:44:44,
+TICKETHELP###########1234567###2005XY356.00###,World Cup List,John Ma
+rck
TICKETHELP###,########,1234567###,2005,3,4,16.00###,2005-3-8 17:44:44,
+TICKETHELP###########1234567###2005XY356.00###,World Cup List,John Ma
+rck
TICKETHELP###,########,1234567###,2006,5,6,23.00###,2006-1-3 17:44:44,
+TICKETHELP###########1234567###2005XY356.00###,World Cup List,John Ma
+rck
TICKETHELP###,########,0933456###,2005,7,8,33.00###,2005-5-7 17:44:44,
+TICKETHELP###########1234567###2005XY356.00###,World Cup List,John Ma
+rck
TICKETHELP###,########,1234567###,2005,9,10,87.00###,2005-5-4 17:44:44
+,TICKETHELP###########1234567###2005XY356.00###,World Cup List,John M
+arck
TICKETHELP###,########,1984567###,2005,11,12,32.00###,2005-3-8 17:44:4
+4,TICKETHELP###########1234567###2005XY356.00###,World Cup List,John 
+Marck
TICKETHELP###,########,1234567###,2005,13,14,67.00###,2006-5-2 17:44:4
+4,TICKETHELP###########1234567###2005XY356.00###,World Cup List,John 
+Marck
TICKETHELP###,########,1223698###,2000,15,16,79.00###,2000-1-1 17:44:4
+4,TICKETHELP###########1234567###2005XY356.00###,World Cup List,John 
+Marck
TICKETHELP###,########,1299n67###,2001,17,18,26.00###,2001-5-5 17:44:4
+4,TICKETHELP###########1234567###2005XY356.00###,World Cup List,John 
+Marck
$ perl -ne 'print if /2005,9,10/ .. eof' foolog
TICKETHELP###,########,1234567###,2005,9,10,87.00###,2005-5-4 17:44:44
+,TICKETHELP###########1234567###2005XY356.00###,World Cup List,John M
+arck
TICKETHELP###,########,1984567###,2005,11,12,32.00###,2005-3-8 17:44:4
+4,TICKETHELP###########1234567###2005XY356.00###,World Cup List,John 
+Marck
TICKETHELP###,########,1234567###,2005,13,14,67.00###,2006-5-2 17:44:4
+4,TICKETHELP###########1234567###2005XY356.00###,World Cup List,John 
+Marck
TICKETHELP###,########,1223698###,2000,15,16,79.00###,2000-1-1 17:44:4
+4,TICKETHELP###########1234567###2005XY356.00###,World Cup List,John 
+Marck
TICKETHELP###,########,1299n67###,2001,17,18,26.00###,2001-5-5 17:44:4
+4,TICKETHELP###########1234567###2005XY356.00###,World Cup List,John 
+Marck

[download]

(Note that the years in your dates are not sorted).

Update: Oops, I didn't see the second date, that's why I mangled the data. Using the original data, it's almost the same but changing the regex:

$ perl -ne 'print if /2005-5-4/ .. eof' foolog
TICKETHELP###,########,1234567###,2005,X,Y,87.00###,2005-5-4 17:44:44,
+TICKETHELP###########1234567###2005XY356.00###,World Cup List,John Ma
+rck
TICKETHELP###,########,1984567###,2005,X,Y,32.00###,2005-3-8 17:44:44,
+TICKETHELP###########1234567###2005XY356.00###,World Cup List,John Ma
+rck
TICKETHELP###,########,1234567###,2005,X,Y,67.00###,2006-5-2 17:44:44,
+TICKETHELP###########1234567###2005XY356.00###,World Cup List,John Ma
+rck
TICKETHELP###,########,1223698###,2000,X,Y,79.00###,2000-1-1 17:44:44,
+TICKETHELP###########1234567###2005XY356.00###,World Cup List,John Ma
+rck
TICKETHELP###,########,1299n67###,2001,X,Y,26.00###,2001-5-5 17:44:44,
+TICKETHELP###########1234567###2005XY356.00###,World Cup List,John Ma
+rck

[download]

--
David Serrano

In reply to Re: Deleting lines prior to a date! by Hue-Bond
in thread Deleting lines prior to a date! by Anonymous Monk

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