A web app that works out how many seconds ago something happened. How hard can coding that be? Tom Scott explains how time twists and turns like a twisty-turny thing. It's not to be trifled with!
If you plan to store UUID values in a Primary Key column, then you are better off using a TSID (time-sorted unique identifier).
One such implementation is offered by the Hypersistence TSID OSS library, which provides a 64-bit TSID that’s made of two parts:
a 42-bit time component
a 22-bit random component
The random component has two parts:
a node identifier (0 to 20 bits)
a counter (2 to 22 bits)
The node identifier can be provided by the tsid.node system property when bootstrapping the application:
-Dtsid.node="12"
The time between overhauls (TBO) of airplane engines is calculated during the manufacturer’s engineering process in order to ensure an aircraft performs its best even after long hours of operation. It’s a critical moment in its existence that will determine future performance so overhauls should not be taken lightly, and neither should TBO since it determines just when and what parts in the engine need to be repaired or refurbished. When these parameters are followed safety is enhanced and the lifespan of an engine can be prolonged. JSA has been managing engine overhauls for over 3 decades, helping aircraft stay safe with our FAA-certified parts. We’re honored to help our clients continue to soar the sky by keeping tabs of their TBO while safely prolonging their flight time.
During Daylight Saving Time, clocks in the United Kingdom are set forward one hour to British Summer Time (BST). The UK is the only country that observes BST in the summer. Some other countries, such as Ireland, observe the same local time, but under a different name.
H. Fliegel, and R. DiEsposti. Proceedings of the 28th Annual Precise Time and Time Interval Systems and Applications Meeting, page 189--200. Reston, Virginia, (December 1996)
J. Strötgen, and M. Gertz. Proceedings of the 5th International Workshop on Semantic Evaluation, page 321--324. Stroudsburg, PA, USA, Association for Computational Linguistics, (2010)