Explains how to manipulate Date and Time.
Points in time are stored and manipulated using the TTime class. TTime uses
a 64-bit integer to represent time as the number of microseconds since midnight
on 1st January 0 AD, using a nominal Gregorian calendar. This gives a possible
range of 580,000 years.
The date/time and its individual components may be set and retrieved using
the TDateTime class. TDateTime is the human
readable form of TTime. It is provided to allow easy user
access to the year, month, day, hour, minute, second and microsecond components
of the time. It does not support manipulation of the date/time, or of its
components, but may be converted into a TTime, and vice versa.
Intervals between points in time are represented by the classes derived
from TTimeIntervalBase and by class TTimeIntervalMicroSeconds.
Time intervals can be added or subtracted, either to or from each other or
to or from points in time. Time interval classes exist because adding two
points in time or subtracting one point in time from another is not possible.
The Time class is a collection of time related utility
functions; for example, functions that check for leap years and return the
number of days in the month.
Care should be taken when
performing arithmetic operations on TTime s especially when
dealing with the last day in the month. For example: