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See also Organising#Time management

  • https://github.com/OculusVR/Flicks - A flick (frame-tick) is a very small unit of time. 1 flick = 1/705600000 second. This unit of time is the smallest time unit which is LARGER than a nanosecond, and can in integer quantities exactly represent a single frame duration for 24 Hz, 25 Hz, 30 Hz, 48 Hz, 50 Hz, 60 Hz, 90 Hz, 100 Hz, 120 Hz, and also 1/1000 divisions of each, as well as a single sample duration for 8 kHz, 16 kHz, 22.05 kHz, 24 kHz, 32 kHz, 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz, and 192kHz, as well as the NTSC frame durations for 24 * (1000/1001) Hz, 30 * (1000/1001) Hz, 60 * (1000/1001) Hz, and 120 * (1000/1001) Hz.

Time zones


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

  • When Can I Reuse This Calendar? - Did you find a 1989 Saved by the Bell calendar in your closet? Are you too cheap to throw out the 2019 calendar you never bothered to open? Now you can party like it's 1964 thanks to WhenCanIReuseThisCalendar.com!


  • XTide - Harmonic tide clock and tide predictor

  • https://github.com/dhocker/lumi-clock - a relatively simple digital clock app that was inspired by the Lumitime clocks of the '70s and '80s. It uses Python3 and Tkinter for the GUI and the Pillow package for implementing an animated GIF. It was originally conceived as a Raspberry Pi based project.


to sort

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



Unix epoch

while true; do echo "$(date +%s)" | figlet ; sleep 0.99 ; done
date -u -d @1400000000
  gives datetime in UTC




  • dateutils - a bunch of tools that revolve around fiddling with dates and times in the command line with a strong focus on use cases that arise when dealing with large amounts of financial data.