This behavior occurs because of the way that Windows NT stores time/date stamp information. All time/dates displayed in Event Log events and files on NTFS partitions are computed as offsets to UTC (which is the same as Greenwich Mean Time [GMT]). When you select your time-zone from the Control Panel Date/Time applet, you are setting the value for UTC. The appropriate number of hours are then added or subtracted to/from the stored UTC value. This adjusted time is then displayed in any operation which reports local time (that is, NT Explorer [NT 4.0], File Manager, directory listings, and so on). When "Automatically Adjust for Daylight Saving Time" is selected, an additional hour is added to GMT during Daylight Saving Time (the first Sunday in April through the last Sunday in October).
ID articolo: 158588 - Ultima revisione: 26 feb 2007 - Revisione: 1