How to mentally calculate the day of the week for any date
Details
- External ID
- 49420714
- Source
- HN
- Company
- —
- Product
- How to mentally calculate the day of the week for any date
- Website domain
- tinkerandsee.com
- Launched
- Aug. 24, 2026
- Cohort
- —
- Upvotes
- 80
- Upvotes percentile
- 0.9099462365591398
- Tags
- —
- Fetched at
- Sept. 10, 2026, 5:32 a.m.
- Updated at
- Sept. 10, 2026, 5:32 a.m.
Enrichment
- Theme
- educational games and interactive learning apps
- Vertical
- Education
- Function
- Content generation
- Audience
- B2C
- AI stance
- Not AI
- Project type
- Hobby / open-source project
- Normalized one-liner
- mental math technique for day of week
- Manually corrected
- False
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 — 211 launches clear the similarity bar, closest 8 shown.
Attention rank: #16 of 212 (itself plus its competitors, highest first — normalized so YC and Product Hunt are compared fairly).
Launched 283 days after the earliest competitor.
- Days Since Date · ph · 2026-09-24 · 1 upvotes · similarity 0.50
- Sumday · hn · 2026-08-27 · 5 upvotes · similarity 0.50
- Calgebra · hn · 2026-01-04 · 5 upvotes · similarity 0.49
- Working Days Calculator · ph · 2026-09-06 · 1 upvotes · similarity 0.49
- nocal is a calendar that turns your week into a workspace · hn · 2026-05-09 · 8 upvotes · similarity 0.48
- Life in Weeks by ClockAura · ph · 2026-09-08 · 2 upvotes · similarity 0.47
- I made a simple time card calculator · hn · 2025-11-14 · 7 upvotes · similarity 0.47
- Diurnal · ph · 2026-09-22 · 78 upvotes · similarity 0.46
Other launches for this product
- No other launches for this product.
Same idea, different domain
Nobody's really built a content generation tool for Government yet.