 
 This variable is used to describe the timezone information that the locale will use.  To set TZ, use the SET 
 which has the following format: 
 
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  >>SETTZ=SSS>  
                       h                        
                         +Ĵ     :m                          
                                      :s                            
                                                                               
  >><  
     DDD                                
            ,sm,sw,sd,st,em,ew,ed,et,shift                                  
                                                                               
 
 
 The values for the TZ variable are defined below. The default values given are for the built-in "C" locale 
 defined by the ANSI C standard. 
 
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  Table 1. TZ Environment Variable Parameters                                  
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  VARIABLE      DESCRIPTION                                  DEFAULT VALUE    
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  SSS           Standard-timezone identifier.  It must be    EST              
                three characters, must begin with a letter,                   
                and can contain spaces.                                       
 Ĵ
  h, m, s       The variable h specifies the difference (in  5                
                hours) between the standard time zone and                     
                coordinated universal time (CUT), formerly                    
                Greenwich mean time (GMT).  You can                           
                optionally use m to specify minutes after                     
                the hour, and s to specify seconds after                      
                the minute.  A positive number denotes time                   
                zones west of the Greenwich meridian; a                       
                negative number denotes time zones east of                    
                the Greenwich meridian.  The number must be                   
                an integer value.                                             
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  DDD           Daylight saving time (DST) zone identifier.  EDT              
                It must be three characters, must begin                       
                with a letter, and can contain spaces.                        
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  sm            Starting month (1 to 12) of DST.             4                
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  sw            Starting week (-4 to 4) of DST.  Use nega-   1                
                tive numbers to count back from the last                      
                week of the month (-1) and positive numbers                   
                to count from the first week (1).                             
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  sd            Starting day of DST.                         0                
                0 to 6 if sw != 0                                             
                1 to 31 if sw = 0                                             
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  st            Starting time (in seconds) of DST.           3600            
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  em            Ending month (1 to 12) of DST.               10              
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  ew            Ending week (-4 to 4) of DST.  Use negative  -1              
                numbers to count back from the last week of                   
                the month (-1) and positive numbers to                        
                count from the first week (1).                                
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  ed            Ending day of DST.                           0                
                0 to 6 if ew != 0                                             
                1 to 31 if ew = 0                                             
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  et            Ending time of DST (in seconds).             7200            
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  shift         Amount of time change (in seconds).          3600            
 
 
 For example: 

    SET TZ=CST6CDT
 
 sets the standard time zone to CST, the daylight saving time zone to CDT, and sets a difference of 6 hours 
 between CST and CUT. It does not set any values for the start and end date of daylight saving time or the time 
 shifted. 

 When TZ is not present, the default is EST5EDT, the "C" locale value. When only the standard time zone is 
 specified, the default value of n (difference in hours from GMT) is 0 instead of 5. 

 If you give values for any of sm, sw, sd, st, em, ew, ed, et, or shift, you must give values for all of them. the 
 entire statement is considered not valid, and the time zone information is not changed. 

 The value of TZ can be accessed and changed by the tzset function. For more information on tzset, see the C 
 Library Reference. 

