2006-02-13  Vincent Celier  <celier@adacore.com>

	* a-direct.adb (Duration_To_Time, OS_Time_To_Long_Integer): New
	Unchecked_Conversion functions.
	(Modification_Time): Use direct conversion of OS_Time to Calendar time
	when OpenVMS returns False.

	* a-dirval-mingw.adb, a-dirval-vms.adb, a-dirval.ads,
	a-dirval.adb (OpenVMS): New Boolean function

From-SVN: r111051