I asked what's the best time to make a show HN post and got the below output.

When should you hit “Submit” on your Show HN? TL;DR The historical data say your odds of going viral improve when you post:

Saturday 18 UTC (≈ 2 PM US-Eastern, 11 AM US-Pacific)

Early Sunday 02 – 04 UTC (Saturday evening in the Americas)

Week-day late morning UTC, especially

Tuesday 11 – 15 UTC (7 – 11 AM US-Eastern)

Wednesday 15 UTC

Friday 12 – 14 UTC

These slots combine the highest average scores with a healthy number of past posts, meaning success isn’t due to just a few outliers.