Why do I celebrate later? (still 13,37 years)

Question

A very little time ago, just a bit ago one may say, people started partying. Some even went out of their houses to do so… crazy thing, IMHO.

Anyway, I don't, I'll start partying in 4886 days.¹
Why do I do so?

I could say in $13.37$ tropical years.² 😇

Note: I do have another tag I could add later, which would make this riddle a lot easier, so I'll leave it for now.

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Want another funny extra tip? Here it is:

Hey, I could also say in $42.2163200 * 10^7$ seconds. Maybe I like the number seven? 🤔

In your answer, please state if you needed the tip… 🙂

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¹ I know, I rounded a bit and had a 3 hour and 33⅓ minute error. That is scientifically acceptable though, because it is a funny number.
² I did that again, I know. I don't have an excuse right now though.😉
³ More hints³ are hidden in here, than you'd expect.⁴ (Extra points, if you can all explain all of them to me.)
⁴ Though not all of them may be useful. Another tip could be to also find out who am I.
⁵ 1 or 2, who cares. I am sometimes too slow.😜

Answer 1

I think you'll start partying in 4886 days because

At 03:33:20 UTC on Wednesday, 18 May 2033, the Unix time value will equal 2000000000 seconds. Perhaps you like Unix time values in multiples of one billion.

I didn't use the tip but possibly

You are hinting at converting the time to seconds.