How to mentally calculate the day of the week for any date
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HN · launched Aug 24, 2026 · 80 upvotes (top 9%) · 0 views
Niche: educational games and learning tools · 207 launches, 24 in the last 7 days ▲ +50% · Explore this niche →
Category and tags
- Education
- Content generation
- B2C
- Not AI
- Hobby / open-source project
Visit website ↗ Source listing ↗
More like this: all 207 launches in educational games and learning tools →
Could you build this?
Yes This is an interactive educational essay combining SVG animations, step-by-step logic, and practice quizzes in vanilla HTML/CSS/JavaScript.
Discussion
20 comments analyzed.
Competitors mentioned: Bob Goddard's 'first Sunday' method for Doomsday algorithm
Concerns raised: LLM writing quality is poor and hard to read, Layout shift animation breaks on mobile (iPhone 13 mini), Content lacks practical real-world applicability, Leap year calculation in Part 5 needs more guidance, Date format confusing for non-US locales (MM/DD vs DD/MM)
Feature requests: Show date when displaying correct answer after user error, Auto-adjust date format based on user localization, More detailed explanation of leap year slide calculation
Competitors
Other products that read as similar to this one : 557 launches clear the similarity bar, closest 8 shown.
Attention rank: #37 of 558 (itself plus its competitors, highest first, normalized so YC and Product Hunt are compared fairly).
Launched 283 days after the earliest competitor.
- Unboundcove Date Tools · ph · 2026-10-28 · 1 upvotes · similarity 0.54
- ScopeLedger Notice Deadline Calculator · ph · 2026-10-07 · 1 upvotes · similarity 0.51
- Days Since Date · ph · 2026-09-24 · 1 upvotes · similarity 0.49
- Sumday · hn · 2026-08-27 · 5 upvotes · similarity 0.49
- Calgebra · hn · 2026-01-04 · 5 upvotes · similarity 0.49
- Work Hours Calculator · ph · 2026-11-06 · 1 upvotes · similarity 0.49
- Time Calculator · ph · 2026-10-31 · 1 upvotes · similarity 0.48
- Working Days Calculator · ph · 2026-09-06 · 1 upvotes · similarity 0.48
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