https://community.hpe.com/t5/operating-system-hp-ux/usr-lib-tztab/m-p/3080021#M142421 yep it works Sun, 28 Sep 2003 11:44:32 GMT Aleksei_1 2003-09-28T11:44:32Z https://community.hpe.com/t5/operating-system-hp-ux/usr-lib-tztab/m-p/3080020#M142420 if I make any changes in /usr/lib/tztab about time in which system clocks should be changed to DST will it work?<BR />for example, if i put in EET-2EETDST section month not 9 but 10 will it change time in october not in september? Sun, 28 Sep 2003 10:39:11 GMT https://community.hpe.com/t5/operating-system-hp-ux/usr-lib-tztab/m-p/3080020#M142420 Aleksei_1 2003-09-28T10:39:11Z https://community.hpe.com/t5/operating-system-hp-ux/usr-lib-tztab/m-p/3080021#M142421 yep it works Sun, 28 Sep 2003 11:44:32 GMT https://community.hpe.com/t5/operating-system-hp-ux/usr-lib-tztab/m-p/3080021#M142421 Aleksei_1 2003-09-28T11:44:32Z https://community.hpe.com/t5/operating-system-hp-ux/usr-lib-tztab/m-p/3080022#M142422 /usr/lib/tztab is a very nifty file. HP-UX uses the rules in this file to translate the computer's internal time clock (which is always GMT or more accurately, UTC or Zulu time). HP-UX never jumps the internal time, only the representation after translating it through $TZ which points to tztab. Since daylight saving is a political, not an astronomical concept, there is never an exact definition even within a single country (the U.S. has a 'funny' timezone glitch in Indiana) so tztab allows you to create any daylight saving rules you need.<BR /> <BR />Note that the kernel has a timezone and dst parameter which are used for daemons or other non-standard programs. The timezone value is in minutes west of GMT and dst has about 6 (not nearly enough) predefined settings. Luckily, no major database vendors or other production applications bypass $TZ but it is useful to set these too. Sun, 28 Sep 2003 12:14:54 GMT https://community.hpe.com/t5/operating-system-hp-ux/usr-lib-tztab/m-p/3080022#M142422 Bill Hassell 2003-09-28T12:14:54Z