UNIX for Advanced & Expert Users

Hi! How ican change parameters for daylight, i mean, i want change the daylight on december first week. I've tried with /usr/lib/tztab but result unsuccessful.

What is your OS? Post the output of "uname -a".

HP-UX Telmex B.11.11 U 9000/785 2008376529 unlimited-user license

I have never this, but it looks like /usr/lib/tztab is the right file on HP-UX. Post your tztab entry and I will try it out.

# Greenwich Mean Time, British Summer Time
GMT0BST
0 3 25-31 3 1983-1984 0 BST-1
0 3 23-29 3 1985-1990 0 BST-1
0 3 25-31 3 1991-1995 0 BST-1
0 2 25-31 3 1996-2038 0 BST-1 <------
0 1 25-31 10 1983-1985 0 GMT0
0 1 23-29 10 1986-1994 0 GMT0
0 1 18-24 10 1995 0 GMT0
0 1 25-31 10 1996-2038 0 GMT0

We want set it to april first sunday .

thanks in advance

No wonder it didn't work for you. You forgot to change anything! The first 0 and 2 say that a change will happen at 2:00. The 25-31 and the 3 says a change will happen sometime March 25 through March 31. Then comes the year range. That final 0 says the change must happen on a Sunday.

So it looks like changing "25-31 3" to "1-7 4" should do it, if I understand what you want.

I only post the original tztab,

# Greenwich Mean Time, British Summer Time
GMT0BST
0 3 1-7 4 2005 0 BST-1
0 1 25-30 11 1996-2038 0 GMT0

for thisexample is set to change on first april sunday at 1:59, 2005 and
last november sunday.