[Ant-user] Ant diagnostics

WHen I type ant -diagnostics I get this result

ant -diagnostics
------- Ant diagnostics report -------
Apache Ant version 1.6.2 compiled on August 5 2004 -> ant 1.6.2

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Implementation Version (JDK1.2+ only)
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core tasks : null
optional tasks : 1.6.2

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ANT_HOME/lib jar listing
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ant.home: /local/skirtane/apache-ant-1.7.0 ->-- ant 1.7

Why is it different ?

Thanks
Shobhana