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sed/awk to retrieve max year in column

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# 1  
Old 08-11-2010
sed/awk to retrieve max year in column
I am trying to retrieve that max 'year' in a text file that is delimited by tilde (~). It is the second column and the values may be in Char format (double quoted) and have duplicate values.

Please help.
# 2  
Old 08-11-2010
Post sample data.
# 3  
Old 08-12-2010
Code:
"Bob"~"2001"~1234
"Nancy"~"2008"~456
"Peter"~"2002"~5433
"Jack"~"2007"~3241
"Rose"~"2002"~9986

Here is a sample. I'd like to get a Max Year value from the second column (basically return 2008 - based on data above)
Last edited by Scott; 08-12-2010 at 10:41 AM.. Reason: Code tags
# 4  
Old 08-12-2010
Code:
awk -F"~" '{gsub("\"","",$2);if ($2>max){max=$2}}END{print max}' file

# 5  
Old 08-12-2010
I am getting

awk: syntax error near line 1
awk: illegal statement near line 1
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