This file is indexed.

/usr/share/kde4/apps/kstars/TZrules.dat is in kstars-data 4:4.8.4-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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#"US": DST starts on the first Sunday of April, reverts on the 
#      last Sunday of October (2:00 am).  Canada uses this 
#      rule as well.
US  Mar  2Sun  02:00  Nov  1Sun  02:00

#"MX": DST starts on the 1st Sunday of May, and switch back on 
#      the last Sunday of September (2:00 am). (Mexico)
MX  May  1Sun  02:00  Sep   Sun  02:00

#"EU": DST starts on the last Sunday of March, reverts on last 
#      Sunday of October (1:00 am)
EU  Mar   Sun  02:00  Oct   Sun  03:00

#"RU": Same as EU but changes at 2:00 instead of 1:00 (Russia)
RU  Mar   Sun  02:00  Oct   Sun  02:00

#"EE": Same as EU but changes at 0:00 instead of 1:00 (East Europe)
EE  Mar   Sun  00:00  Oct   Sun  02:00

#"CH": DST starts 2nd Sun in Apr, reverts 2nd Sun in Sept (0:00) 
#      (China; the dates are rather uncertain...)
CH  Apr  2Sun  00:00  Sep  2Sun  00:00

#"HK": DST starts 2nd Sun in May, reverts 3rd Sun in Oct (3:30) 
#      (Hong Kong)
HK  May  2Sun  03:30  Oct  3Sun  03:30

#"IR": DST starts Mar 21, reverts Sep 22 (0:00) (note: these
#      dates are approximate, since Iran doesn't use the 
#      Gregorian calendar.  Dates vary between March 20-21 and 
#      Sep 22-23)
IR  Mar    21  00:00  Sep    22  00:00

#"IQ": DST starts Apr 1, reverts Oct 1 (3:00). (Iraq)
IQ  Apr     1  03:00  Oct     1  00:00

#"ZN": DST starts Apr 1, reverts Oct 1 (1:00).  Israel has no
#      fixed law for start/end dates, so these are approximate.
ZN  Apr     1  01:00  Oct     1  00:00

#"JD": DST starts last Thu of Mar, reverts last Thu of Sep (0:00)
#      (Jordan)
JD  Mar   Thu  00:00  Sep   Thu  00:00

#"SK": DST starts 2nd Sun in May, reverts 2nd Sun in Oct (0:00)
#(South Korea)
SK  May  2Sun  00:00  Oct  2Sun  00:00

#"LB": DST starts last Sun in March, reverts last Sun in Oct (0:00)
#(Lebanon)
LB  Mar   Sun  00:00  Oct   Sun  00:00

#"SY": DST starts Apr 1, reverts Oct 1 (0:00). (Syria)
SY  Apr     1  00:00  Oct     1  00:00

#"TS": DST starts 1st Sun in Oct, reverts last Sun in Mar (2:00)
TS  Oct  1Sun  02:00  Mar   Sun  02:00

#"AU": DST starts last Sun in Oct, reverts last Sun in Mar (2:00)
AU  Oct   Sun  02:00  Mar   Sun  02:00

#"NZ": DST starts 1st Sun in Oct, reverts 3rd Sun in Mar (2:00)
NZ  Oct  1Sun  02:00  Mar  3Sun  02:00

#"CZ": DST starts 1st Sun in Oct, reverts 3rd Sun in Mar (2:45)
#      (used for Chatham, New Zealand)
CZ  Oct  1Sun  02:45  Mar  3Sun  02:45

#"TG": DST starts 1st Sunday in Nov, reverts last Sun in Jan (2:00)
#(Tonga)
TG  Nov  1Sun  02:00  Jan   Sun  02:00

#"BZ": DST starts 2nd Sun in Oct, reverts 3rd Sun in Feb (0:00)
#(Brazil)
BZ  Oct  2Sun  00:00  Feb  3Sun  00:00

#"CL": DST starts 2nd Sun in Oct, reverts 2nd Sun in Mar (4:00)
#(Chile)
CL  Oct  2Sun  04:00  Mar  2Sun  04:00

#"PY": DST starts 1st Sun in Oct, reverts 1st Sun in Mar (0:00)
#(Paraguay)
PY  Oct  1Sun  00:00  Mar  1Sun  00:00

#"EG": DST starts last Fri in Apr, reverts last Thu in Sep (0:00)
#(Egypt)
EG  Apr   Fri  00:00  Sep   Thu  00:00

#"NB": DST starts 1st Sun in Sep, reverts 1st Sun in Apr (2:00)
#(Namibia)
NB  Sep  1Sun  02:00  Apr  1Sun  02:00

#"FK": DST starts 1st Sun in Sep, reverts 3rd Sun in Apr (2:00)
#(Falkland Islands)
FK  Sep  1Sun  02:00  Apr  3Sun  02:00

#"--": no DST correction is used.
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