How does Linux handle DST ( daylight saving time)?
Hello
Can sombody please tell me how linux handles DST ( daylight saving time) ?
Does the time change instantly , ex: if is is 3'o clock does linux instantly swich to 2'o clock ?
No. Linux uses epoch time - the number of seconds since Jan 1, 1970. Look at the very top right of the pages here on UNIX.com. Look for UNIX time. Currently it is 1413986703 seconds.
There is something called the C runtime library - all of the commands in UNIX use that library. Because people use differing locale settings (alphabetic characters, names for months, different ways od doing daylight savings times etc.) the guys who put this together decided to use some library calls to change the UNIX epoch seconds into human readable time, including changes from standard to daylight time.
ctime() and strftime() are part of that library. The date command uses the library and provides a command line interface for times and dates.
So if you are in a country with no daylight/standard time change, then date knows about it through your locale and timezone settings.
Type
at the command line to see your settings.
Not always -- it can be globally set with a file, too, /etc/localtime, which you copy from a selection in /usr/share/localtime. I copied /usr/share/zoneinfo/Canada/Saskatchewan for instance. This gives my system a timezone without having a value set for TZ.
TZ is often used to override the global setting to operate in multiple regions... and sometimes for crude date math (subtracting a number of hours), etc.
Hi,
I have few doubt on daylight saving.
Can any one clarify the below points.
1) How to configure daylight saving(DLS) time ?
2) How to query DLS ?
3) If i set DLS(say some how) will it be autometically changed or user has to manually change system time ?
I got few info on net about... (3 Replies)
Hi,
I have one confusion regarding DST chnages which are going to happen after October. :confused: :confused:
I have few jobs on Autosys which run as per Japan Time. they shoudl not be affected by switiching off of DST time.
Our autosys instance server is based on UK which is running on... (0 Replies)
Hi folks,
I would like to read the start date and end date of the Daylight Saving Time for the given timezone in the given year. What's the function in C/C++ to read the start of the Daylight Saving date and end of Daylight saving date?
I'm using Linux 2.6.xx Kernel.
For Example, in... (4 Replies)
The daylight saving action is not working
Time zone was set for that Australia(parth) and issued reboot.
Now for DST, (Daylight Saving Time):
For 29 Oct 2006 (sunday) day, if set time is 1:59:00 than after 1 minute it will
become 3:00:00 as per DST . This was found to be happening.i.e DST... (1 Reply)
The daylight saving action is not working
Time zone was set for that Australia(parth) and issued reboot.
Now for DST, (Daylight Saving Time):
For 29 Oct 2006 (sunday) day, if set time is 1:59:00 than after 1 minute it will
become 3:00:00 as per DST . This was found to be happening.i.e DST... (1 Reply)
Hello!
I'm currently working on a climatological dataset that uses unix-timestamp and a real date like 28/03/2004 02:45:00 h. in spring the unix-timestamp follows its continuos mode but in the column of the real date the time jumps one hour forward (e.g. from 1:59:59 to 3:00:00). i think this is... (1 Reply)