Re: [ntp:questions] Can i control the NTP Sync?
Unruh wrote: [] ntp knows nothing about time zones. It gets the remote time in UTC. time zone info is all handled by your local machine. On unix/linux/.. (sensible machnes) the machine time is ALWAYS UTC. time routines do the translation using a file called /etc/localtime. On windows it is more difficult, since Microsoft has never heard of timezones, so you have to kludge it yourself. Exactly how your machine or your implimentation of ntp kludges it I do not know. No, you do not need to kludge it yourself with Windows - there is a set of routines built into Windows you can call if you wish to get local time, and a set of registry values provided and updated with Windows which allow it to keep local time in just the same way as other systems. If you have to intervene manually you are doing something wrong. Windows, like many modern OSes, works in UTC internally. David ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions
Re: [ntp:questions] Can i control the NTP Sync?
Unruh wrote: machnes) the machine time is ALWAYS UTC. time routines do the translation using a file called /etc/localtime. On windows it is more difficult, since Not all Unixes use the Olson package and some may use a different location for this file. Some Unixes, in current use, encode the rules in an environment variable, which needs to be changed when the rules change (but not when the clocks change), and thus an application restart. Earlier ones only allowed the base timezone offset to be changed but had the, historic, US timezone rules hardcoded. I think the original Unix did timezones only the kernel. You will have some problems in exchanging media between Unix systems if you don't run them on UTC, as file timestamps are stored in the POSIX encoding of UTC and converted to local time by the ls command, etc. Microsoft has never heard of timezones, so you have to kludge it yourself. Microsoft have supported timezones since Windows 9x or earlier and have reasonably proper support since Windows NT. For legacy reasons, they store wall clock time in the RTC hardware. Windows encodes the rules in the registry and the registry needs updating when the rules change, but I don't think you need an application restart. (Both the older Unix system and NT are limited to two changes and two offsets per year.) Exactly how your machine or your implimentation of ntp kludges it I do not know. More precisely, you always need to specify what OS you are using. Not specifying in an NTP context tends to imply Linux, but Linux tends to be leading edge and any recent one will use the Olson package. ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions
Re: [ntp:questions] Can i control the NTP Sync?
David Woolley wrote: David J Taylor wrote: it to keep local time in just the same way as other systems. If you have to intervene manually you are doing something wrong. Windows, like many modern OSes, works in UTC internally. Using UTC internally is, I think, only true of NT, and comes from its VMS heritage, rather than from its Windows one. Well, since 1992! NT 3.1, 3.5, 4, Windows 2000, XP , Vista etc! I'm not talking 16-bit Windows or DOS. I seem to remember that Windows 3.x was not timezone aware, and I think that Windows 9.x only has per system timezone information and works internally on local time. (Quite a few home users still use Windows 95 and some small businesses probably still do so - it might also be in embedded systems used by larger businesses.) 32-bit Windows such as 95/98/ME etc. all support the same time API, and use UTC internally. FAT and VFAT filesystems always use local time. I'm not sure about NTFS. NTFS and CDFS (I think) use UTC. Windows remains compatible when access the older file systes, as I hope would UNIX and its derivatives. Windows timezone handling is limited to a single pair of rules per timezone, with one (or zero) changes each way between two offsets. The Olson package, used on most Linuxes and modern Unixes, can record all historic and all future changes, even if they are not reducible to one, simple, rule. Whilst you can force, at least some, NT systems to treat the RTC as UTC, most system administrators don't even know this. It would be useful to have a record of leap seconds as well. Is that in the Olson package? For my own stuff - photos mainly - I stick with labelling in UTC time - no offsets at all. My wife prefers local time in the country taken. So her and my photos in Australia have names which are 11 hours (IIRC) different: 2008-08-13-0100-1234.jpg 2008-08-13-1200-1234.jpg Can be fun when you are looking at photos from three different cameras taking multiple shots of the same subject (a group of friends on the Sydney Harbour bridge walk), all on (sigh) slightly different time settings (even though precisely synched before leaving home). Cheers, David ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions
Re: [ntp:questions] Can i control the NTP Sync?
David Woolley [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] [...] Using UTC internally is, I think, only true of NT, ... Which, conveniently, is also the only Windows family that will run NTP. Groetjes, Maarten Wiltink ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions
[ntp:questions] Can i control the NTP Sync?
Dear Experts, I am thinking of using the NTP services, but I have one problem which is When the time zone change from summer to winter or from winter to summer So currently we have control on the local time and we changed manually when the time zone change, because we don’t change the local time on that machine even due the time zone changed if we have a running operation and we keep it this way until the ongoing job Finish. So the problem here if we have the NTP server sync to that machine the sync will force the local time to change, which will affect our operation. Any suggestion Regards, Sami _ News, entertainment and everything you care about at Live.com. Get it now! http://www.live.com/getstarted.aspx ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions
