Description GDateTime is a structure that combines a Gregorian date and time into a single structure. It provides many conversion and methods to manipulate dates and times. Time precision is provided down to microseconds and the time can range (proleptically) from 0001-01-01 00:00:00 to 9999-12-31 23:59:59.999999. GDateTime follows POSIX time in the sense that it is oblivious to leap seconds. GDateTime is an immutable object; once it has been created it cannot be modified further. All modifiers will create a new GDateTime. Nearly all such functions can fail due to the date or time going out of range, in which case NULL will be returned. GDateTime is reference counted: the reference count is increased by calling g_date_time_ref() and decreased by calling g_date_time_unref(). When the reference count drops to 0, the resources allocated by the GDateTime structure are released. Many parts of the API may produce non-obvious results. As an example, adding two months to January 31st will yield March 31st whereas adding one month and then one month again will yield either March 28th or March 29th. Also note that adding 24 hours is not always the same as adding one day (since days containing daylight savings time transitions are either 23 or 25 hours in length). GDateTime is available since GLib 2.26.