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void tzset(void);
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tzset()º¯ÊýʹÓû·¾³±äÁ¿TZµÄµ±Ç°ÉèÖðÑÖµ¸³¸øÈý¸öÈ«¾Ö±äÁ¿:daylight,timezoneºÍtzname¡£
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set TZ=tzn[+|-]hh[:mm[:ss]][dzn]
tzn£ºÈý×ÖÄ¸Ê±ÇøÃû,ÀýÈçPST,Äã±ØÐëÖ¸³ö±¾µØÊ±¼ä¾àUTCµÄÆ«ÒÆÁ¿¡£
hh£ºUTCÓë±¾µØÊ±¼äµÄʱ²î,ÈÎÑ¡´ø·ûºÅµÄ¡£
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ss£ºÃëÖÓ,ÓÃðºÅ(:)Óëmm·Ö¸ô¿ª¡£
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setenv("TZ", "GMT-8", 1);
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set TZ=GST-1GDT
set TZ=GST+1GDT
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timezone    UTCº


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