(PHP 5.5.0, PECL >= 3.0.0a2)
IntlCalendar::toDateTime — Convert an IntlCalendar into a DateTime object
此函数没有参数。
A DateTime object with the same timezone as this
object (though using PHP?s database instead of ICU?s) and the same time,
except for the smaller precision (second precision isntead of millisecond).
Returns FALSE
on failure.