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If an end user interaction with dates and times is required, the software will nearly always convert this internal number into a date and time representation that is comprehensible to humans.
The following table lists epoch dates used by popular software and other computer-related systems.
The following statistics can affect optimizer decisions: Without accurate statistics, the optimizer could choose a suboptimal projection or join order for a query.
The official Japanese system numbers years from the accession of the current emperor, regarding the calendar year during which the accession occurred as the first year.
A similar system existed in China before 1912, being based on the accession year of the emperor (1911 was thus the third year of the Xuantong period).
With the establishment of the Republic of China in 1912, the republican era was introduced.
It is still very common in Taiwan to date events via the republican era.
It was inefficient and error prone for data observed by one group to need translation (mathematic transformation) so other groups could compare information.
The current standard epoch is called "J2000.0" This is defined by international agreement to be equivalent to: The time kept internally by a computer system is usually expressed as the number of time units that have elapsed since a specified epoch, which is nearly always specified as midnight Universal Time on some particular date.
Over time, inexactitudes and other errors accumulate, creating more and greater errors of prediction, so ephemeris factors need to be recalculated from time to time, and that requires a new epoch to be defined.
Different astronomers or groups of astronomers used to define epochs to suit themselves, but in these days of speedy communications, the epochs are generally defined in an international agreement, so astronomers worldwide can collaborate more effectively.
The time in these systems is stored as the quantity of a particular time unit (days, seconds, nanoseconds, etc.) that has elapsed since a stated time (usually midnight UTC at the beginning of the given date).Tags: Adult Dating, affair dating, sex dating