Time Zone Master has many features for those that need to know time related information in one or many places, in the future or past, with highest accuracy:

• TZ Zoneinfo Data

  Instead of using the built-in Windows timezone data, which is limited, often out-of-date, and contains no historical data; Time Zone Master uses the tz zoneinfo database of current and historical timezones and daylight saving (summer) time rules. It can automatically load, compile and uses the database directly. It supports over 300 timezone regions worldwide. It can be set up to automatically download and install upgrades to the zone rule database from our servers when new zoneinfo data is published. You can see times based on current rules, or the known rules in the future or past.




• GeoNames Data

  Time Zone Master uses data from the geonames.org database, over 45,000 locations from over 200 countries and principalities; with latitude, longitude and zoneinfo database information. This allows you to quickly select locations for your clocks without typing any data.




• Astronomical Data

  Time Zone Master internally uses ELP2000 and VSOP87 sun and moon data to compute extremely accurate astronomical information for the sun and moon, in the past or future.




• Displays Clocks on your Desktop

  Open one, or as many clocks as can fit across your screen. These clocks will show you the current time in each location you choose, keeping track of timezone rule changes and daylight summer clock changes on each clock automatically when they occur. The clocks can also show a simulation of the relative positions of the sun and the moon for each location. As well, they can show the time offset between your home and the other locations you have chosen.




• Explore time related information for each location for times in the future and past:

  - Universal Time
  - Local Clock Time with Timezone codes
  - Clock change times and clock adjustments required at that time
  - Local Mean Time
  - Equation of Time
  - Local Apparent (Sundial) Time
  - Greenwich Sidereal Time
  - Local Sidereal Time
  - Delta-T
  - Terrestrial Time
  - Sunrise Times
  - Sun Transits Times(Local Apparent Noon)
  - Sunset Times
  - Moonrise Times
  - Moon Transit Times
  - Moonset Times
  - Moon Phase Times
  - Equinox & Solstice Times (Season Starts)