String manipulation question

Can I do these simple string operations using XSLT
functions -- in other words, without resorting to extension
functions?

1. Convert iso8601 dates to Java string format
    2000-10-05T12:03:32 => 2000-10-05 12:03:32
    seems pretty simple... just get rid of the T.  
    
2. Replace all occurences of one character
    with another.  

Thanks,
Terris


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