The Corvidan Archipelago uses a system of timekeeping measured with a 24-hour clock and a lunisolar calendar. Times are written in the format MN:HR DD-MM-YYYY.
Each Corvidan day is measured from 01:01, which is the approximate minute that the sun rises on Day 1 of Month 1, until 59:24, the minute before the sun rises on the following day. Days are broken up into 4 quarter-days: sunrise, sunset, moonrise, and moonset. The transition points between quarter-days are called dawn, mid-day, dusk, and midnight. Because the sun rises and sets at different times throughout the seasons, the actual period of daylight does not usually align with the time periods referred to as sunrise and sunset. Each quarter-day contains 6 hours, which are further divided into 60 minutes. Minutes can be subdivided into an even smaller unit of time called seconds which are rarely used outside of scientific contexts. Most Corvidans work during 1 of the 4 quarter-days, with businesses typically open from dawn until dusk. Many essential services operate 24 hours a day, with employees scheduled to work any of the 4 quarter-day shifts. Any quarter-day employee whose daily work exceeds a 6-hour period is paid overtime; freelancers, who set their own hours, instead receive a fixed daily pay rate. Mandatory primary and secondary schooling takes place during sunset, but some education programs are offered during sunrise or moonrise.
The Corvidan year begins on Day 1 of Month 1, which is also the first day of the Corvidan season of summer. The Corvidan season of winter begins on Day 1 of Month 7. Each year consists of 12 months, which are in turn broken up into 6 weeks, each consisting of 5 days. The final day of each week is a holiday for most Corvidans, excepting those in essential service positions. These 30-day months are asynchronous with the lunar calendar, so moon phases do not occur on set days of the month. 12 months also does not exactly align with the solar year, which is approximately 365.25 days long. After Day 30 of Month 12, the Corvidan calendar adds intercalary days to ensure that Day 1 of Month 1 of the following year is still the first day of summer. There are typically 4-6 intercalary days, with the amount determined during the intercalary days of the previous year. These intercalary days are also a holiday for both workers and students. In Iryna, elections are held on Day 30 of Month 12, with the victor taking office on Day 1 of Month 1 of the following year; the intercalary days serve as a transition period to coordinate the transfer of power.
Since prehistory, Corvidans have used sundials and other horological devices to measure the passage of time. Because the Corvidan Archipelago exists in the Aequor Arcanus' Southern Hemisphere, their sundials rotate in a direction that, in English, would be referred to as counterclockwise. In the Corvidan language, the equivalent directions are /SLA'A ("sunwise") and
BALK/SLA'A ("countersunwise"). In modern times, Corvidans use magitech devices such as SmartStones that display the time in numeral format instead of as an analog clock interface.