Time Standards

Terran Standard
The Terran Standard Calendar, also known as the Gregorian Calendar represents the standard time and dating system used by the Terran Government, as originating on Terra. Used widely throughout Terra and even beyond, it is the oldest active dating and time system in common use, dating back to its introduction by Pope Gregory XIII in 1582 AD. Though the Terran Standard calendar is still widely used by the Terran Government for coordination and business, it has largely fallen out of favor outside Terran controlled space in favor of the less Terra-centric Universal Standard Calendar.

The base unit of the Terran Standard calendar is the second, which is officially defined as the lowest energy state radiation cycles of a single atom of cesium-133 (Which is 9,192,631,770 Hz).undefined The Second can be further broken down by measures of 10. The Terran Standard calendar further divides time into minutes (containing 60 seconds), hours (containing 60 minutes) and days (containing 24 hours). Additionally the Terran year consists of 365 days and is divided into 12 months with a variable number of days. Additionally the year contains 52.14 weeks. Because of this inconsistency additional days must be inserted into the calendar to reset the period.

The present date in Terran Standard time is 5th Jan, 3137.

Universal Standard
A TST-UST converter is available here

As stellar-colonization became increasingly complex the need for a universal time standard for coordination between the growing human colonies on Mars and Luna was made apparent. By the mid 2060's the United Nations called for the creation of a "Universal Standard Time" to help assist with the coordination between the major human populations. Following two decades of controversy and dispute a formal standard was laid in place. The new time standard would use the SI Second as its base unit (Thus not deviating from the existing time standards), and would be decimalized -- with 100 seconds in a minute, 100 minutes in an hour, and 10 hours in a day. Further the system would have no months (Which were traditionally based on lunar cycles) and 300 days per year. This means one UST year consists of 30 million seconds, and is ~95.066% of a standard year.

Universal Standard Time is an Epoch Calendar, meaning it tracks its zero-hour to an event -- in this case the date the Universal Standard Calendar was put into effect which was Midnight, July 19th 2092 Greenwich Mean Time. As such the date 19 Jul, 2092 00:00:00 in TST is formatted in UST as 1/001 00:000:000

Y/D HH:MM:SS