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Full Discussion: Winter/Summer time change
Top Forums UNIX for Dummies Questions & Answers Winter/Summer time change Post 55796 by bcheaib on Monday 20th of September 2004 08:27:57 AM
Old 09-20-2004
Question Winter/Summer time change

Reliant Unix.

Our branch in Syria has a Unix Server running our company application.
Usually the the time is changed not in a fixed date.....but around end of October and beginning of November.

The night of the summer winter time change last year...we put the server in singel user mode, then we change the /etc/TIMEZONE file to:
TZ=GMT-2Syria and we booted, and after that the time was added one hour...GREAT. One week later we were surprised that the time was added again one hour automatically (according to the Asian summber winter time it seems....!!!) so we had to shutdown the server again and put the TZ as GMT-3Syria.
For this year and after some investigation we decided to do the following:
Next month we will have time change from summer time which is [GMT + 3] in local
time to winter time [GMT + 2], this time change will be done by changing the TZ
parameter in the /etc/TIMEZONE and reboot the system the suggested TZ is:
TZ=Syr-2SyrDST,M4.1.5/04:00:00,M10.1.5/05:00:00
With this TZ the time will be changed from GMT+2 to GMT+3 on the first Friday from April at 04:00:00AM (from 04:00:00 to 05:00:00) and from the GMT+3 to GMT+2 on the first Friday from October at 05:00:00AM (from 05:00:00 to 04:00:00), my question is:

- Is the above mentioned TZ parameter with the description correct?
- With the above mentioned TZ is there any configuration file involved in the time change and the daylight saving control?
- Can we guarantee that the time won't be changed automatically with the local time zone if we implement the above mentioned TZ?

Sorry if this was very boring....
 

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date(1) 						      General Commands Manual							   date(1)

Name
       date - print date and time

Syntax
       date [-c | -u] [ +format ] [[yy[mm[dd]]]hhmm[.ss][-[-]tttt][z]]

Description
       If no argument is given, or if the argument begins with +, the current date and time are printed.  Otherwise, the current date is set.  The
       first mm is the month number; dd is the day number in the month; hh is the hour number (24 hour clock); the second mm is the minute number;
       .ss  the second; -[-]tttt is the minutes west of Greenwich; a positive number means your time zone is west of Greenwich (for example, North
       and South America) and a negative number means it is east of Greenwich (for example Europe); z is a one letter code indicating the dst cor-
       rection mode (n=none, u=usa, a=australian, w=western europe, m=middle europe, e=eastern europe); yy is the last 2 digits of the year number
       and is optional.  The following example sets the date to Oct 8, 12:45 AM:
       date 10080045
       The current year is the default if no year is mentioned.  The system operates in GMT.  The takes care of the conversion to and  from  local
       standard and daylight time.

       If  the	argument begins with +, the output of is under the control of the user.  The format for the output is similar to that of the first
       argument to All output fields are of fixed size (zero padded if necessary).  Each field descriptor is preceded by % and is replaced in  the
       output by its corresponding value.  A single % is encoded by %%.  All other characters are copied to the output without change.	The string
       is always terminated with a new-line character.

Options
       -c     Perform operations using Coordinated Universal Time (UCT) instead of the default local time. The UCT does not use  leap  seconds	so
	      UCT is the same as GMT.

       -u     Perform operations using Greenwich Mean Time (GMT) instead of the default local time.

       + format
	      The following is a list of field Descriptors that can be used in the format (Note: date exits after processing format information) :

		 %a   Locale's abbreviated weekday name

		 %A   Locale's full weekday name

		 %b   Locale's abbreviated month name

		 %B   Locale's full month name

		 %c   Locale's date and time representation

		 %d   Day of month as a decimal number (01-31)

		 %D   Date (%m/%d/%y)

		 %h   Locale's abbreviated month name

		 %H   Hour as a decimal number (00-23)

		 %I   Hour as a decimal number (01-12)

		 %j   Day of year (001-366)

		 %m   Number of month (01-12)

		 %M   Minute number (00-59)

		 %n   Newline character

		 %p   Locale's equivalent to AM or PM

		 %r   Time in AM/PM notation

		 %S   Second number (00-59)

		 %t   Tab character

		 %T   Time (%H/%M/%S)

		 %U   Week number (00-53), Sunday as first day of week

		 %w   Weekday number (0[Sunday]-6)

		 %W   Week number (00-53), Monday as first day of week

		 %x   Locale's date representation

		 %X   Locale's time representation

		 %y   Year without century (00-99)

		 %Y   Year with century

		 %Z   Timezone name, no characters if no timezone

		 %%   %

Examples
       The following command line
       date +%m/%d/%y
       generates the following output
       04/02/89
       The following command line
       date +"DATE: %m/%d/%y%nTIME: %H:%M:%S"
       generates the following output
       DATE: 04/02/89
       TIME: 14:45:05
       The quotes (") are necessary because the format contains blank characters. Use single quotes (') to prevent interpretation by the shell.

Diagnostics
       Failed to set date: Not owner
	    You are not the super-user and you tryed to change the date.  Do not change the date while the system is running in multiuser mode.

Restrictions
       An attempt to set a date to before 1/1/1970 will result in the date being set to 1/1/1970.

Files
       /dev/kmem

																	   date(1)
All times are GMT -4. The time now is 04:45 PM.
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