nifty command line date and time utilities; fast date calculations and conversion in the shell

Timezones for embedded systems

This project implements conversion of IANA tzdata into iCalendar VTIMEZONE objects

Easy direct access to the most recent official time zone information for iCalendar files via JavaScript.

Matrix Weather Clock on an ESP8266 microcontroller

A command line tool for collaborating across timezones.

This library enables you to use RTC from RTL8720-based boards such as RTL8720DN, RTL8722DM, RTL8722CSM. This RTL8720-based RTC, using Interrupt, has no battery backup. Time will be lost when powered down. To need NTP-client to update RTC every start-up.

A Mongoose-OS library which will set the cryptic 'sys.tz_spec' from a human readable notation.

A small C project which calculates day length, sunrise, sunset and twilight (astronomical, civil and nautical) time from date, latitude and longitude according to UTC of the place.

This is a Cocoa library that enables the user to find the country, region, city, coordinates, zip code, time zone, ISP, domain name, connection type, area code, weather station name, mobile, usage types, etc that any IP address or hostname originates from.

Low-level library provides full feature API for working with date, time, zone, epoch, DST

IANA timezone library for C

New firmware for the Spikenzie Labs Solder:Time Desk Clock

Time zone database for embedded systems

Time handling functions to overcome some common limits

I wrote this Windows API multi-zone digital clock in 1995. I still use it.

Time zone information in friendly JSON for use cases like server-side validation, user input options, etc.

TinyTZ (ttz) is a lightweight timezone library for C

GTK+3 port of gworldclock

Get the timezone posix string from GPS coordinates