The boosters from daily quests are still given even after the event ends

I didn't even know there was an event and started late, but thanks to that, I'm using them well every day haha Although it says the expiration date is one day, when the next day comes, it shows D-0 for the expiration date, so I can use it the next day too. So, in reality, the expiration date is two days. It's so convenient and I wish there were more quests that give boosters like this haha