Stock Option trading symbols (21Feb instead of 25Feb)

Why do all the stock options show an expiry of 21-Feb while on the NSE website its 25-Feb

Sample 5 instruments from the market data
12630274 49337 AARTIIND21FEB1000CE AARTIIND
12630530 49338 AARTIIND21FEB1000PE AARTIIND
12630786 49339 AARTIIND21FEB1020CE AARTIIND
12631042 49340 AARTIIND21FEB1020PE AARTIIND

Also how do I get the instrument_token for the weekly expiry. The data pulled from the instrument API, seems to have only monthly expiry
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