

Note that this locks the screen rotation on all devices and to return to the calculation screen you must touch "Back to main screen". A simple UTC clock, which can be used to determine the current UTC date/time in milliseconds since 1 or formatted as ISO string. iPad large digit clock is selected by touching the button "UTC screen". A useful feature of the app is that if you rotate the iPhone you then have a large digit UTC clock. On dual-boot systems that require local time in the RTC, be aware that if you have to reboot Linux. The user must "allow notifications" for the background to function. On machines that only run Linux, set the RTC to UTC (or GMT). The alarm is set via the pick wheels and operates in the background for sound and screen notification as well as the foreground if application is running. The app also works in reverse where the user types in the epoch time and the pick wheels will spin to the human readable date. The System Clock must be kept in the UTC timescale for date-time applications to work correctly in conjunction with the timezone configured for the system. This is the standard format for manipulation of spacecraft tracking TLE's (Two Line Element sets). FFFFFF is the decimal fraction of the day.

The application allows the user to select any epoch time in the future or past via pick wheels and that time is then displayed as YYDDD.FFFFFF where YY=Two digit year, where DDD=day of the year (000 - 366), and where.
The time has to have millisecond precision, but using: auto currently std::chrono::timepointcastUTC stands for "Universal Time Coordinated", but is also known as Zulu Time or GMT Time. I want to send a time point over a network connection to detect the ping time and for other calculations. Using the app is equally straightforward: click & drag the display to move it. The application also contains a UTC alarm clock that is based on "Day of Year". To install, simply download the zip file, extract, and run the setup program. UTC Orbit is a time conversion utility for use with Earth orbital elements calculations for spacecraft.
