Historical Data for current Date using historical_data API

"The historical data API provides archived data (up to date as of the time of access) for instruments across various exchanges spanning back several years." from the kite connect api,but when I try for the same day using from_date and to_date=datetime.now() using kite.historical_data it shows data for last date(i.e yesterday) not today.
What is the procedure to get data for same day say forr half and hour back?
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