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Timekeeping and temporal systems

Clocks, calendars, time zones, timestamps, precision timekeeping, and time in software.

6,020 stories · 102 in 30 days · Updated Sep 28, 2026

The pace of conversation

Posts per month

2020-01: 89 posts2020-02: 69 posts2020-03: 80 posts2020-04: 61 posts2020-05: 72 posts2020-06: 80 posts2020-07: 50 posts2020-08: 69 posts2020-09: 68 posts2020-10: 92 posts2020-11: 69 posts2020-12: 73 posts2021-01: 71 posts2021-02: 75 posts2021-03: 70 posts2021-04: 62 posts2021-05: 63 posts2021-06: 73 posts2021-07: 58 posts2021-08: 54 posts2021-09: 55 posts2021-10: 72 posts2021-11: 63 posts2021-12: 81 posts2022-01: 100 posts2022-02: 49 posts2022-03: 87 posts2022-04: 57 posts2022-05: 53 posts2022-06: 62 posts2022-07: 76 posts2022-08: 68 posts2022-09: 61 posts2022-10: 77 posts2022-11: 96 posts2022-12: 76 posts2023-01: 104 posts2023-02: 68 posts2023-03: 93 posts2023-04: 64 posts2023-05: 69 posts2023-06: 63 posts2023-07: 58 posts2023-08: 69 posts2023-09: 51 posts2023-10: 79 posts2023-11: 97 posts2023-12: 61 posts2024-01: 96 posts2024-02: 115 posts2024-03: 92 posts2024-04: 88 posts2024-05: 87 posts2024-06: 47 posts2024-07: 61 posts2024-08: 71 posts2024-09: 68 posts2024-10: 84 posts2024-11: 58 posts2024-12: 83 posts2025-01: 80 posts2025-02: 57 posts2025-03: 60 posts2025-04: 69 posts2025-05: 70 posts2025-06: 76 posts2025-07: 60 posts2025-08: 74 posts2025-09: 73 posts2025-10: 97 posts2025-11: 62 posts2025-12: 117 posts2026-01: 105 posts2026-02: 77 posts2026-03: 112 posts2026-04: 69 posts2026-05: 64 posts2026-06: 69 posts2026-07: 96 posts2026-08: 83 posts2026-09: 93 posts
2020-012026-09

Posts per month · first and latest months may be partial.

01 / EXPLORE THROUGH TIME

Timeline

Start with the latest. Scroll back through time, or zoom in for more.

Year by yearUp to 5 stories per year
2026768 stories
Can we have the day off?↗ mlsu.io · HN · 776 comments · 1415 points · May 28, 2026
Temporal: The 9-year journey to fix time in JavaScript↗ bloomberg.github.io · HN · 266 comments · 790 points · Mar 11, 2026
British Columbia is permanently adopting daylight time↗ cbc.ca · HN · 561 comments · 1177 points · Mar 02, 2026
The Singularity will occur on a Tuesday↗ campedersen.com · HN · 756 comments · 1381 points · Feb 10, 2026
Converting a $3.88 analog clock from Walmart into a ESP8266-based Wi-Fi clock↗ github.com · HN · 193 comments · 606 points · Feb 09, 2026
2025895 stories
Calendar↗ neatnik.net · HN · 133 comments · 1108 points · Dec 28, 2025
AI World Clocks↗ clocks.brianmoore.com · HN · 384 comments · 1383 points · Nov 14, 2025
Precision Clock Mk IV↗ mitxela.com · HN · 126 comments · 552 points · May 31, 2025
How fast the days are getting longer (2023)↗ joe-antognini.github.io · HN · 203 comments · 613 points · Mar 19, 2025
Show HN: Time Portal – Get dropped into history, guess where you landed↗ eggnog.ai · HN · 213 comments · 497 points · Mar 12, 2025
2024950 stories
An Unreasonable Amount of Time↗ allenpike.com · HN · 89 comments · 545 points · Dec 31, 2024
Making a watch from scratch↗ old.reddit.com · HN · 86 comments · 516 points · Dec 14, 2024
Australia/Lord_Howe is the weirdest timezone↗ ssoready.com · HN · 455 comments · 1147 points · Oct 30, 2024
Xkcd 1425 (Tasks) turns ten years old today↗ simonwillison.net · HN · 467 comments · 1003 points · Sep 24, 2024
Show HN: I made a tool to compare time zones↗ time.fyi · HN · 220 comments · 758 points · Jan 05, 2024
2023876 stories
Synctify – Sync a music drop with a time in the real world↗ synctify.app · HN · 28 comments · 66 points · Dec 31, 2023
DIY Night Clock Projector (2018)↗ microengineer.eu · HN · 48 comments · 166 points · Dec 25, 2023
Show HN: Weeks of Your Life↗ weeksofyour.life · HN · 83 comments · 145 points · Dec 24, 2023
Resetting the timer in my toothbrush↗ nonnullish.pages.dev · HN · 108 comments · 174 points · Dec 24, 2023
Bug story: Sorting by timestamp↗ adam-p.ca · HN · 46 comments · 68 points · Dec 23, 2023
2022862 stories
The leap second’s time is up: world votes to stop pausing clocks↗ nature.com · HN · 438 comments · 684 points · Nov 18, 2022
Circadian lighting with Home Assistant: Like f.lux, but for your house↗ tylercipriani.com · HN · 231 comments · 534 points · Nov 07, 2022
The Hummingbird Clock: date videos by background mains hum↗ hummingbirdclock.info · HN · 148 comments · 537 points · Oct 09, 2022
Google Timer is gone↗ google.com · HN · 323 comments · 560 points · Jul 31, 2022
It’s time to leave the leap second in the past↗ engineering.fb.com · HN · 583 comments · 440 points · Jul 25, 2022
2021797 stories
“This project will only take 2 hours”↗ web.eecs.utk.edu · HN · 271 comments · 398 points · Nov 09, 2021
Samoa Scraps Daylight Saving Time↗ timeanddate.com · HN · 278 comments · 414 points · Sep 23, 2021
ISO 8601: a better date format↗ kirby.kevinson.org · HN · 424 comments · 367 points · Feb 26, 2021
Arranging Invisible Icons in Quadratic Time↗ randomascii.wordpress.com · HN · 111 comments · 376 points · Feb 16, 2021
Timezone Bullshit↗ blog.wesleyac.com · HN · 319 comments · 400 points · Feb 10, 2021
2020872 stories
American Academy of Sleep Medicine calls for elimination of daylight saving time↗ aasm.org · HN · 486 comments · 1600 points · Aug 29, 2020
Siri, What Time Is It in London?↗ daringfireball.net · HN · 748 comments · 728 points · May 22, 2020
Show HN: Plotting 3 years of hourly data in 150ms↗ leeoniya.github.io · HN · 102 comments · 785 points · May 01, 2020
Time is the only real currency we have↗ blog.theboringtech.io · HN · 300 comments · 595 points · Apr 25, 2020
Palindrome Day 20200202↗ blog.sumymus.de · HN · 173 comments · 723 points · Feb 02, 2020
Scroll through time ↕

02 / CATCH UP

The conversation now

Popular stories, with attention fading over roughly two weeks.

Fixing the Portobello Police Station Clock↗ pointinthecloud.com · HN · 116 comments · 548 points · Sep 23, 2026
Scientists build most accurate atomic clock↗ phys.org · HN · 26 comments · 63 points · Sep 24, 2026
Sun Clock↗ sunclock.net · HN · 92 comments · 289 points · Aug 17, 2026
A faster way to calculate the day of the week↗ benjoffe.com · HN · 90 comments · 269 points · Aug 16, 2026
It's "Underwear on the Outside" Time↗ paulkrugman.substack.com · HN · 5 comments · 15 points · Sep 24, 2026

03 / GO DEEPER

Follow your curiosity

Find a particular story, revisit a year, or see what resonated.

Highest rated · the last 30 days

Fixing the Portobello Police Station Clock↗ pointinthecloud.com · HN · 116 comments · 548 points · Sep 23, 2026
Scientists build most accurate atomic clock↗ phys.org · HN · 26 comments · 63 points · Sep 24, 2026
The Ancient Greek Water Clock That Kept the Most Accurate Time for 1,800 Years↗ openculture.com · HN · 11 comments · 41 points · Sep 09, 2026
Rebuilding a 1995 GPS Time Server so I don't get Telstra'd↗ jeffgeerling.com · HN · 17 comments · 40 points · Sep 05, 2026
Please consider running a NTP server in the NTP Pool↗ dreamstation.systems · HN · 8 comments · 37 points · Sep 08, 2026
Every Millisecond Counts↗ jordivillar.com · HN · 3 comments · 24 points · Sep 09, 2026
A one-handed clock on the hyperbolic plane↗ jpivarski.github.io · HN · 3 comments · 20 points · Aug 31, 2026
It's "Underwear on the Outside" Time↗ paulkrugman.substack.com · HN · 5 comments · 15 points · Sep 24, 2026
Unix Year 2038 problem and the art of underestimating↗ buzzsprout.com · HN · 9 comments · 15 points · Sep 19, 2026
Roman Timekeeping↗ en.wikipedia.org · HN · 4 comments · 15 points · Sep 19, 2026

10 stories shown.

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