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How to Make a WiFi QR Code (So Guests Never Ask for the Password)

Reading a long, random WiFi password aloud to every guest gets old quickly. A WiFi QR code solves it: point a phone camera at the code and the phone offers to join the network.

  • WiFi QR codes simplify connecting to networks without sharing passwords.
  • iPhones (iOS 11+) and many Android phones can scan these codes.
  • Use a browser-based generator, test, and print at readable size near router.

Unix Timestamps Explained: Seconds, Milliseconds, and Time Zones

A Unix timestamp (also called epoch time or POSIX time) is the number of seconds that have passed since 00:00:00 UTC on 1 January 1970, a moment known as the Unix epoch.

  • Unix timestamp represents seconds since 1970 epoch
  • Seconds vs milliseconds differentiated by number length
  • Store timestamps in UTC to avoid Year 2038 problem

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