How to filter the balance sheet report date wise?

You can do one thing. Write a seperate like balancesheet and call that report from via XML by applying SVFromdate and SVTodate.

[Report : My Balance Sheet]
  Use  : Balance Sheet
  Form : Balance Sheet
  Set  : SVFrom date : ##SVFromDate
  Set  : SVToDate    : ##SVToDate
 
in XML,
 
Replace the Report Name with above.

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