symbol format for amibroker

1) Weekly BANKNIFTY Option Formate

-----Weekly Options for October 2022:-----
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NSE F&O Options expire on Evry Thursday
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>> 1st 3 weeks are weekly.

>> last week is monthly
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E.g:- BANKNIFTY-YY-M(First Alphabet)-00(DD)-31000-CE
here BANKNIFTY-22(year)-O(October)-06(Date)-31000(Strike Price)-CE(Call))

1st Week>> BANKNIFTY22O0631000CE<< Actual Symbol

2nd Week>> BANKNIFTY22O1331000CE << Actual Symbol

3rd Week>> BANKNIFTY22O2031000CE << Actual Symbol

4th Week>> Monthly

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Note:- For weekly symbols January to September using month numeric digit >> 1 to 9
And for October to December using Month first's Alphabets >> O / N / D
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2) Monthly BANKNIFTY Options

--------------Monthly Option for October 2022:-------------------

E.g:- BANKNIFTY-YY-MMM-31000-CE

here, BANKNIFTY-22(Year)-October(Month)-31000(strike)-CE

Last Week of the month (hence considered monthly):

BANKNIFTY22OCT31000CE << Actual Symbol

3) NIFTY Weekly & Monthly Option Format.

-----NIFTY Weekly and Monthly Options for October 2022:-----
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NSE F&O Options expire Every Thursday
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>> 1st 3 weeks are weekly.

>> last week is monthly
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Weekly Expiry > NIFTY + YY + MONTH(First Alphabet) + 0 +Strike +CE/PE > NIFTY22O0611000CE

Monthly Expiry > NIFTY + YY + MMM +Strike +CE/PE > NIFTY22OCT11000CE

NIFTY22OCT11000PE

Contract Future > Use symbol - NIFTY22OCTFUT