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wiki:time_zone [2011/06/06 12:25] – Guywiki:time_zone [2012/12/01 05:31] (current) – Last revision reverted. (Would lead to different result) tinypoodle
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 I'd just like to expand a bit on the use of the 'tz' boot code to specify the local time zone (including the provision of daylight saving information). Please note that this is an alternative to copying a file to '/etc/localtime' and not to be used in conjunction with that approach. I'd just like to expand a bit on the use of the 'tz' boot code to specify the local time zone (including the provision of daylight saving information). Please note that this is an alternative to copying a file to '/etc/localtime' and not to be used in conjunction with that approach.
  
-(1) In the case of no daylight saving the boot code simply needs the name of the timezone and the offset to UTC. Example India:+==== Without Daylight Saving ==== 
 + 
 +In the case of no daylight saving the boot code simply needs the name of the timezone and the offset to UTC. Example India:
     tz=IST-5:30    i.e. India is 5h30 "ahead" of UTC, AFAIK 'IST' stands for "India Standard Time"     tz=IST-5:30    i.e. India is 5h30 "ahead" of UTC, AFAIK 'IST' stands for "India Standard Time"
  
-(2) Things get a bit more varied with daylight saving. The TZ definition now also adds the name of the timezone during daylight saving and the details when daylight saving starts and ends. Example France:+==== With Daylight Saving ====
  
-tz=CET-1CEST,M3.5.0,M10.5.0/3  with the following components:+Things get a bit more varied with daylight saving. The TZ definition now also adds the name of the timezone during daylight saving and the details when daylight saving starts and ends. Example France:
  
-      CET                                               timezone name during standard time (i.e. "Central European Time") +  tz=CET-1CEST,M3.5.0,M10.5.0/3  with the following components: 
-             -1                                            offset during standard time (i.e. 1h "ahead") +     CET                         timezone name during standard time (i.e. "Central European Time") 
-                CEST                                   timezone name during daylight saving (i.e. "Central European Summer Time") +        -1                       offset during standard time (i.e. 1h "ahead") 
-                              3                            start of daylight saving: the month (i.e. March) +          CEST                   timezone name during daylight saving (i.e. "Central European Summer Time") 
-                                5                          the week (i.e. last) +                3                start of daylight saving: the month (i.e. March) 
-                                  0                        the day (i.e. Sunday) +                  5              the week (i.e. last) 
-                                          10             end of daylight saving: the month (i.e. October) +                    0            the day (i.e. Sunday) 
-                                                5         the week (i.e. last) +                       10        end of daylight saving: the month (i.e. October) 
-                                                   0      the day (i.e. Sunday) +                          5      the week (i.e. last) 
-                                                      3   the time (i.e. 03:00:00)+                            0    the day (i.e. Sunday) 
 +                              3  the time (i.e. 03:00:00)
                                                                                                                
 Please note: Since no time is specified for the start of CEST the default value of 02:00:00 will be used.  Please note: Since no time is specified for the start of CEST the default value of 02:00:00 will be used. 
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