Time

General

See also Organising#Time management

• https://xkcd.com/1335/
  • https://news.ycombinator.com/item?id=7384025

• http://www.vendian.org/envelope/TemporaryURL/time.html

Time zones

• http://www.iana.org/time-zones

• http://everytimezone.com/

Calendar

• http://www.timeanddate.com/calendar/?country=9

For accounting: a 5 week month = 5 weeks including a Monday

• http://www.moonstick.com/moonstick.htm [1]

• http://99percentinvisible.org/episode/the-calendar/
  • https://www.reddit.com/r/DIY/comments/3cholo/my_girlfriend_and_i_made_a_pretty_unconventional/

• http://qntm.org/calendar [2]

• http://nerdiversary.herokuapp.com/1983-11-02

• http://calizo.sourceforge.net

• Historic Calendars of Europe - generate

Clocks

• http://www.theguardian.com/science/2015/apr/19/clockmaker-john-harrison-vindicated-250-years-absurd-claims

• WP: WWVB

• http://www.anishathalye.com/2016/12/26/micro-wwvb/ [3]

• http://www.prc68.com/I/timefreq.shtml

• http://www.limmy.com/deedeespeakingclock/

to sort

• http://www.waitbutwhy.com/2013/08/putting-time-in-perspective.html

1h = 3600s 1d = 86400s 1w = 604800s 28d = 2419200s

• http://rsnous.com/posts/2014-08-07-pinhole-a-falling-ball-demo.html

• time cheatsheet

http://jtnimoy.net/workviewer.php?q=178

• http://www.whatsthetimethere.netai.net/msm/

• http://www.fourmilab.ch/documents/calendar/

• http://ilyabirman.net/projects/forebruary/

• https://snipt.net/dogstarchampion/metric-time-indicator-for-ubuntu-unity/

• http://poisson.phc.unipi.it/~maggiolo/index.php/2014/01/how-much-is-time-wrong-around-the-world/

• WP: Runic_calendar

• http://pagancalendar.co.uk/

• http://skreksto.re/products/durr

• http://www.iers.org/nn_10398/IERS/EN/Science/EarthRotation/UT1-TAI.html?__nnn=true

• WP: Decimal_time
• WP: Swatch_Internet_Time [4]

• http://www.visualnews.com/2014/03/17/artist-spent-month-creating-digital-sundial-says-dont-throw-watch/

• https://news.ycombinator.com/item?id=11094274

• https://news.ycombinator.com/item?id=7965317

• http://www.moongiant.com/

• http://procyonic.org/clocks/ [5]

• http://www.famsi.org/research/vanstone/2012/index.html

• http://www.hexahedria.com/experiments/qrclock/index.html

• https://news.ycombinator.com/item?id=12617263
• https://news.ycombinator.com/item?id=12540941

Unix epoch

while true; do echo "$(date +%s)" | figlet ; sleep 0.99 ; done

• http://www.epochconverter.com/epoch/clock.php

date -u -d @1400000000
  gives datetime in UTC

NTP

• Network Time Protocol - a protocol designed to synchronize the clocks of computers over a network.
  • WP: Network_Time_Protocol

• LWN.net: A rift in the NTP world - [6]

NTPsec

• Welcome to NTPsec - a secure, hardened, and improved implementation of Network Time Protocol derived from NTP Classic, Dave Mills’s original.
  • https://github.com/ntpsec/ntpsec

• Linux Journal: NTPsec: a Secure, Hardened NTP Implementation - by Eric S. Raymond on March 30, 2017

Linux

• http://man7.org/linux/man-pages/man3/strftime.3.html - time format/template