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How to use date and time in Firebird?
Added in: 2.1 Description: Returns the number of years, months, days, hours, minutes, seconds or milliseconds elapsed between two date/time values. DATE and TIMESTAMP arguments can be combined. No other mixes are allowed. With DATE arguments, only YEAR, MONTH and DAY can be used.
Which is correct measure for ” 6Y ” in Firebird?
In the “6Y” from 1999 to 2004 there were TWO leap years, but in the same “6Y” from 1998 to 2003 there only was ONE leap year. Which of those is correct measure for “6Y” ???
Can a DATEDIFF query generate a valid answer?
So, any DateDiff-based query would essentially generate a perfectly valid answer of the kind of “2Y 10M give or take few days” – an answer that IS valid for this context of “just give me overall impression”. Marrying this simplicity of getting a feel of it with perfectionism of mathematical accuracy just is not possible.
Why does DATEDIFF not look at smaller units?
DATEDIFF doesn’t look at any smaller units than the one specified in the first argument. As a result, It does, however, look at all the bigger units. So:
What are the first two digits of a year in Firebird?
First two digits of a year segment (e.g., 20 for the twenty-first century). Year in century. Firebird always stores the full year value if the year is entered without the CC segment, using a “sliding window” algorithm (see below) to determine which century to store.
Which is closer to 1954 or 2054 in Firebird?
However, 1954 is closer to 2004 than is 2054 because all dates between 1954 and 1955 are closer to 2004 than all dates between 2054 and 2055. Nothing causes more confusion for international users than Firebird’s restricting the use of the forward slash character (/) to only the U.S. ‘MM/DD/CCYY’ format.
Which is part of the date literal does Firebird accept?
The TIME data type accepts only the time part. Whether the year part of a DATE or TIMESTAMP literal is submitted in SQL as CCYY or YY, Firebird always stores the full year value. It applies an algorithm in order to deduce the CC (century) part, and it always includes the century part when it retrieves date types.