historical data fetching only one todays data for f&o

//have already fetched instruments list and stored it in dataframe
def instrumentLookup(instrument_df,symbol):
"""Looks up instrument token for a given script from instrument dump"""
try:
return instrument_df[instrument_df.tradingsymbol==symbol].instrument_token.values[0]
except:
return -1

// function which returns historical data taking interval and duration instrument lookup is used to fetch instrument id
def fetchOHLC(ticker,interval,duration):
"""extracts historical data and outputs in the form of dataframe"""
instrument = instrumentLookup(instrument_df,ticker)
data = pd.DataFrame(kite.historical_data(instrument,dt.date.today()-dt.timedelta(duration),
dt.date.today(),interval))
data.set_index("date",inplace=True)
return data

fetchOHLC('NIFTY21APRIL14100PE','3minute',10)

Thankyou sujith for looking into the issue i found it there was a wrong date parameter sent between the functions .