Stock options in India have monthly expirations, with the last Thursday of the month being the typical expiry day.
"And similarly, if we talk about our Fin Nifty, Bank Nifty, which are indices, they also have different weekly expiry. Okay. For example, if we talk about Nifty, it expires on Thursday. If we talk about Fin Nifty, it expires on Tuesday. If we talk about Bank Nifty, it expires on Wednesday."