adding -'s to a numeric string

From: Date: Wed, 21 Apr 2004 15:34:00 +0000
Subject: adding -'s to a numeric string
Groups: php.general 
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Hi, I have a form where I have a user entering in the date in a numeric string. For today they would enter 04212004 and so on...I'm working on this date within mysql server, and mssql server handles dates as 04-21-2004 when you use convert(varchar,field,110). So how in PHP can I change a variable's value which is 04122004 into 04-21-2204 thanks!

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