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The number of days can be a whole number and can also include a fraction—for example, 1.5 would represent one-and-a-half days, or 36 hours.
In the following example, a piece of machinery is installed 6/14/2016 at a.m.
When using date literals, you must use SQL-supported date formats.
You may want to add time to or subtract time from a date field or an SQL-supported date literal to produce an updated date field.
When length is a negative number, it is rounded on the left side of the decimal point.
The calculated date field is the original date plus or minus the number of days you want to add or subtract.
For example, you can calculate a future inspection or review date by adding time to a date.