"DAY" incorrectly included in 2024 data

[lktarheel-a11y]

Hey,

The ticker "DAY" is incorrectly in the 2024 data:
"DAY,2024-02-01,"

This exists on:
https://raw.githubusercontent.com/fja05680/sp500/master/sp500_ticker_start_end.csv

(Note: WDAY was added December 23, 2024... so it could have been related to that?)

I'd like to thank you very much for this data! Very helpful!!

Happy Coding

[fja05680]

Hello, I investigated this issue and discovered that it is correct. CDAY was changed to DAY on 2024-02-01.

https://www.dayforce.com/uk/who-we-are/newsroom/ceridian-to-change-ticker-symbol-to-day-on-nyse-and-tsx-effective-february-1

The way I handle symbol change is to add/remove the symbol on the day of the change. But then DAY was removed on 2026-02-09.