Description:
------------
[Follow-up on bug 20382, after systematic testing for times returned that are on the days we asked for, but are not midnight or 1 AM, and then eliminating duplicates within a timezone. Note that there can be valid non-one-hour DST transitions (very rare, but they do happen), so there is a very good chance that at least some of these are bogus. However, 17 of the 26 do not appear to involve a DST or timezone transition, so these 17 would appear less likely to be bogus].

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<?php

print "TZ=America/Jujuy  - Is it OK for this to be 2 AM, rather than 1 AM as per most DST transitions?\n";
putenv("TZ=America/Jujuy");
$tStamp = mktime (17, 17, 17, 1, 7593, 1970);
print "tStamp=". date("l Y-m-d H:i:s T I", $tStamp). "\n";
$strtotime_tstamp = strtotime("Monday", $tStamp);
print "result=".date("l Y-m-d H:i:s T I", $strtotime_tstamp)."\n";
print "wanted=Monday            00:00:00\n\n";


print "TZ=Africa/Bujumbura - *Note*: Unexpected, as does not appear to have a DST or timezone transition.\n";
putenv("TZ=Africa/Bujumbura");
$tStamp = mktime (17, 17, 17, 1, 1, 1970);
print "tStamp=". date("l Y-m-d H:i:s T I", $tStamp). "\n";
$strtotime_tstamp = strtotime("Wednesday", $tStamp);
print "result=".date("l Y-m-d H:i:s T I", $strtotime_tstamp)."\n";
print "wanted=Wednesday            00:00:00\n\n";


print "TZ=Asia/Thimbu - Is it OK for this to be 0:30 AM?\n";
putenv("TZ=Asia/Thimbu");
$tStamp = mktime (17, 17, 17, 1, 6476, 1970);
print "tStamp=". date("l Y-m-d H:i:s T I", $tStamp). "\n";
$strtotime_tstamp = strtotime("Thursday", $tStamp);
print "result=".date("l Y-m-d H:i:s T I", $strtotime_tstamp)."\n";
print "wanted=Thursday            00:00:00\n\n";


print "TZ=Indian/Cocos - Is it OK for this to be 6:30 AM? Note: does not appear to have a DST or timezone transition.\n";
putenv("TZ=Indian/Cocos");
$tStamp = mktime (17, 17, 17, 1, 1, 1970);
print "tStamp=". date("l Y-m-d H:i:s T I", $tStamp). "\n";
$strtotime_tstamp = strtotime("Thursday", $tStamp);
print "result=".date("l Y-m-d H:i:s T I", $strtotime_tstamp)."\n";
print "wanted=Thursday            00:00:00\n\n";


print "TZ=Africa/Lubumbashi - Is it OK for this to be 2 AM? Note: does not appear to have a DST or timezone transition.\n";
putenv("TZ=Africa/Lubumbashi");
$tStamp = mktime (17, 17, 17, 1, 1, 1970);
print "tStamp=". date("l Y-m-d H:i:s T I", $tStamp). "\n";
$strtotime_tstamp = strtotime("Saturday", $tStamp);
print "result=".date("l Y-m-d H:i:s T I", $strtotime_tstamp)."\n";
print "wanted=Saturday            00:00:00\n\n";


print "TZ=Asia/Kashgar - Is it OK for this to be 3 AM?\n";
putenv("TZ=Asia/Kashgar");
$tStamp = mktime (17, 17, 17, 1, 3767, 1970);
print "tStamp=". date("l Y-m-d H:i:s T I", $tStamp). "\n";
$strtotime_tstamp = strtotime("Thursday", $tStamp);
print "result=".date("l Y-m-d H:i:s T I", $strtotime_tstamp)."\n";
print "wanted=Thursday            00:00:00\n\n";


print "TZ=Indian/Christmas - Is it OK for this to be 7 AM?  Note: does not appear to have a DST or timezone transition.\n";
putenv("TZ=Indian/Christmas");
$tStamp = mktime (17, 17, 17, 1, 1, 1970);
print "tStamp=". date("l Y-m-d H:i:s T I", $tStamp). "\n";
$strtotime_tstamp = strtotime("Sunday", $tStamp);
print "result=".date("l Y-m-d H:i:s T I", $strtotime_tstamp)."\n";
print "wanted=Sunday            00:00:00\n\n";


print "TZ=America/Santo_Domingo - Is it OK for this to be 0:30 AM?\n";
putenv("TZ=America/Santo_Domingo");
$tStamp = mktime (17, 17, 17, 1, 291, 1970);
print "tStamp=". date("l Y-m-d H:i:s T I", $tStamp). "\n";
$strtotime_tstamp = strtotime("Sunday", $tStamp);
print "result=".date("l Y-m-d H:i:s T I", $strtotime_tstamp)."\n";
print "wanted=Sunday            00:00:00\n\n";


print "TZ=Pacific/Truk - Is it OK for this to be 10 AM?  Note: does not appear to have a DST or timezone transition.\n";
putenv("TZ=Pacific/Truk");
$tStamp = mktime (17, 17, 17, 1, 1, 1970);
print "tStamp=". date("l Y-m-d H:i:s T I", $tStamp). "\n";
$strtotime_tstamp = strtotime("Tuesday", $tStamp);
print "result=".date("l Y-m-d H:i:s T I", $strtotime_tstamp)."\n";
print "wanted=Tuesday            00:00:00\n\n";


print "TZ=Pacific/Ponape - Is it OK for this to be 11 AM?  Note: does not appear to have a DST or timezone transition.\n";
putenv("TZ=Pacific/Ponape");
$tStamp = mktime (17, 17, 17, 1, 1, 1970);
print "tStamp=". date("l Y-m-d H:i:s T I", $tStamp). "\n";
$strtotime_tstamp = strtotime("Monday", $tStamp);
print "result=".date("l Y-m-d H:i:s T I", $strtotime_tstamp)."\n";
print "wanted=Monday            00:00:00\n\n";


print "TZ=Asia/Tbilisi - Is it OK for this to be 2 AM?\n";
putenv("TZ=Asia/Tbilisi");
$tStamp = mktime (17, 17, 17, 1, 12863, 1970);
print "tStamp=". date("l Y-m-d H:i:s T I", $tStamp). "\n";
$strtotime_tstamp = strtotime("Sunday", $tStamp);
print "result=".date("l Y-m-d H:i:s T I", $strtotime_tstamp)."\n";
print "wanted=Sunday            00:00:00\n\n";


print "TZ=America/Scoresbysund - Is it OK for this to be 2 AM?\n";
putenv("TZ=America/Scoresbysund");
$tStamp = mktime (17, 17, 17, 1, 4099, 1970);
print "tStamp=". date("l Y-m-d H:i:s T I", $tStamp). "\n";
$strtotime_tstamp = strtotime("Sunday", $tStamp);
print "result=".date("l Y-m-d H:i:s T I", $strtotime_tstamp)."\n";
print "wanted=Sunday            00:00:00\n\n";


print "TZ=America/Guyana - Is it OK for this to be 0:45 AM?  Note: does not appear to have a DST or timezone transition.\n";
putenv("TZ=America/Guyana");
$tStamp = mktime (17, 17, 17, 1, 2031, 1970);
print "tStamp=". date("l Y-m-d H:i:s T I", $tStamp). "\n";
$strtotime_tstamp = strtotime("Thursday", $tStamp);
print "result=".date("l Y-m-d H:i:s T I", $strtotime_tstamp)."\n";
print "wanted=Thursday            00:00:00\n\n";


print "TZ=Asia/Tehran - Is it OK for this to be 0:30 AM? Note: does not appear to have a DST or timezone transition.\n";
putenv("TZ=Asia/Tehran");
$tStamp = mktime (17, 17, 17, 1, 2855, 1970);
print "tStamp=". date("l Y-m-d H:i:s T I", $tStamp). "\n";
$strtotime_tstamp = strtotime("Tuesday", $tStamp);
print "result=".date("l Y-m-d H:i:s T I", $strtotime_tstamp)."\n";
print "wanted=Tuesday            00:00:00\n\n";


print "TZ=Pacific/Tarawa - Is it OK for this to be Midday? Note: does not appear to have a DST or timezone transition.\n";     
putenv("TZ=Pacific/Tarawa");
$tStamp = mktime (17, 17, 17, 1, 1, 1970);
print "tStamp=". date("l Y-m-d H:i:s T I", $tStamp). "\n";
$strtotime_tstamp = strtotime("Monday", $tStamp);
print "result=".date("l Y-m-d H:i:s T I", $strtotime_tstamp)."\n";
print "wanted=Monday            00:00:00\n\n";


print "TZ=Africa/Monrovia - Is it OK for this to be 00:44:30 AM? (Strange time).\n";
putenv("TZ=Africa/Monrovia");
$tStamp = mktime (17, 17, 17, 1, 845, 1970);
print "tStamp=". date("l Y-m-d H:i:s T I", $tStamp). "\n";
$strtotime_tstamp = strtotime("Monday", $tStamp);
print "result=".date("l Y-m-d H:i:s T I", $strtotime_tstamp)."\n";
print "wanted=Monday            00:00:00\n\n";


print "TZ=Asia/Katmandu - Is it OK for this to 0:15 AM?.\n";
putenv("TZ=Asia/Katmandu");
$tStamp = mktime (17, 17, 17, 1, 5838, 1970);
print "tStamp=". date("l Y-m-d H:i:s T I", $tStamp). "\n";
$strtotime_tstamp = strtotime("Wednesday", $tStamp);
print "result=".date("l Y-m-d H:i:s T I", $strtotime_tstamp)."\n";
print "wanted=Wednesday            00:00:00\n\n";         


print "TZ=Pacific/Nauru - Is it OK for this to be 0:30? No DST or timezone transition.\n";
putenv("TZ=Pacific/Nauru");
$tStamp = mktime (17, 17, 17, 1, 3401, 1970);
print "tStamp=". date("l Y-m-d H:i:s T I", $tStamp). "\n";
$strtotime_tstamp = strtotime("Tuesday", $tStamp);
print "result=".date("l Y-m-d H:i:s T I", $strtotime_tstamp)."\n";
print "wanted=Tuesday            00:00:00\n\n";           


print "TZ=Pacific/Niue - Is it OK for this to be 0:30 AM? No DST or timezone transition.\n";
putenv("TZ=Pacific/Niue");
$tStamp = mktime (17, 17, 17, 1, 3189, 1970);
print "tStamp=". date("l Y-m-d H:i:s T I", $tStamp). "\n";
$strtotime_tstamp = strtotime("Sunday", $tStamp);
print "result=".date("l Y-m-d H:i:s T I", $strtotime_tstamp)."\n";
print "wanted=Sunday            00:00:00\n\n";            


print "TZ=Pacific/Port_Moresby - Is it OK for this to be 10 AM? No DST or timezone transition.\n";
putenv("TZ=Pacific/Port_Moresby");
$tStamp = mktime (17, 17, 17, 1, 1, 1970);   
print "tStamp=". date("l Y-m-d H:i:s T I", $tStamp). "\n";
$strtotime_tstamp = strtotime("Thursday", $tStamp); 
print "result=".date("l Y-m-d H:i:s T I", $strtotime_tstamp)."\n";
print "wanted=Thursday            00:00:00\n\n";          


print "TZ=America/Miquelon - Is it OK for this to be 2 AM ?\n";
putenv("TZ=America/Miquelon");
$tStamp = mktime (17, 17, 17, 1, 3767, 1970);
print "tStamp=". date("l Y-m-d H:i:s T I", $tStamp). "\n";
$strtotime_tstamp = strtotime("Thursday", $tStamp);
print "result=".date("l Y-m-d H:i:s T I", $strtotime_tstamp)."\n";
print "wanted=Thursday            00:00:00\n\n";


print "TZ=Pacific/Palau - Is it OK for this to be 9 AM? No DST or timezone transition.\n";
putenv("TZ=Pacific/Palau");   
$tStamp = mktime (17, 17, 17, 1, 1, 1970);   
print "tStamp=". date("l Y-m-d H:i:s T I", $tStamp). "\n";
$strtotime_tstamp = strtotime("Saturday", $tStamp);
print "result=".date("l Y-m-d H:i:s T I", $strtotime_tstamp)."\n";
print "wanted=Saturday            00:00:00\n\n";


print "TZ=Pacific/Funafuti - Is it OK for this to be midday?  Note: does not appear to have a DST or timezone transition.\n";
putenv("TZ=Pacific/Funafuti");
$tStamp = mktime (17, 17, 17, 1, 1, 1970);
print "tStamp=". date("l Y-m-d H:i:s T I", $tStamp). "\n";
$strtotime_tstamp = strtotime("Wednesday", $tStamp);
print "result=".date("l Y-m-d H:i:s T I", $strtotime_tstamp)."\n";
print "wanted=Wednesday            00:00:00\n\n";


print "TZ=Pacific/Wake - Is it OK for this to be midday?  Note: does not appear to have a DST or timezone transition.\n";
putenv("TZ=Pacific/Wake");
$tStamp = mktime (17, 17, 17, 1, 1, 1970);
print "tStamp=". date("l Y-m-d H:i:s T I", $tStamp). "\n";
$strtotime_tstamp = strtotime("Tuesday", $tStamp);
print "result=".date("l Y-m-d H:i:s T I", $strtotime_tstamp)."\n";
print "wanted=Tuesday            00:00:00\n\n";


print "TZ=Pacific/Wallis - Is it OK for this to be midday?  Note: does not appear to have a DST or timezone transition.\n";
putenv("TZ=Pacific/Wallis");
$tStamp = mktime (17, 17, 17, 1, 1, 1970);
print "tStamp=". date("l Y-m-d H:i:s T I", $tStamp). "\n";
$strtotime_tstamp = strtotime("Tuesday", $tStamp);
print "result=".date("l Y-m-d H:i:s T I", $strtotime_tstamp)."\n";
print "wanted=Tuesday            00:00:00\n\n";


print "TZ=America/Paramaribo - Is it OK for this to be 0:30 AM?  Note: does not appear to have a DST or timezone transition.\n";
putenv("TZ=America/Paramaribo");
$tStamp = mktime (17, 17, 17, 1, 5381, 1970);
print "tStamp=". date("l Y-m-d H:i:s T I", $tStamp). "\n";
$strtotime_tstamp = strtotime("next Monday", $tStamp);
print "result=".date("l Y-m-d H:i:s T I", $strtotime_tstamp)."\n";
print "wanted=Monday            00:00:00\n\n";

?>
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Output on my Debian 3.0r6 Linux system, versus expected output:

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ludo:~/tmp/php-5.1-dev/php5-200506201830/sapi/cli# ./php ~/test/possibly-invalid-non-one-hour-DST-timezone-shifts.php 
TZ=America/Jujuy  - Is it OK for this to be 2 AM, rather than 1 AM as per most DST transitions?
tStamp=Monday 1990-10-15 17:17:17 ART 0
result=Monday 1990-10-22 02:00:00 ARST 1
wanted=Monday            00:00:00

TZ=Africa/Bujumbura - *Note*: Unexpected, as does not appear to have a DST or timezone transition.
tStamp=Thursday 1970-01-01 17:17:17 CAT 0
result=Wednesday 1970-01-07 02:00:00 CAT 0
wanted=Wednesday            00:00:00

TZ=Asia/Thimbu - Is it OK for this to be 0:30 AM?
tStamp=Thursday 1987-09-24 17:17:17 IST 0
result=Thursday 1987-10-01 00:30:00 BTT 0
wanted=Thursday            00:00:00

TZ=Indian/Cocos - Is it OK for this to be 6:30 AM? Note: does not appear to have a DST or timezone transition.
tStamp=Thursday 1970-01-01 17:17:17 CCT 0
result=Thursday 1970-01-08 06:30:00 CCT 0
wanted=Thursday            00:00:00

TZ=Africa/Lubumbashi - Is it OK for this to be 2 AM? Note: does not appear to have a DST or timezone transition.
tStamp=Thursday 1970-01-01 17:17:17 CAT 0
result=Saturday 1970-01-03 02:00:00 CAT 0
wanted=Saturday            00:00:00

TZ=Asia/Kashgar - Is it OK for this to be 3 AM?
tStamp=Thursday 1980-04-24 17:17:17 KAST 0
result=Thursday 1980-05-01 03:00:00 CST 0
wanted=Thursday            00:00:00

TZ=Indian/Christmas - Is it OK for this to be 7 AM?  Note: does not appear to have a DST or timezone transition.
tStamp=Thursday 1970-01-01 17:17:17 CXT 0
result=Sunday 1970-01-04 07:00:00 CXT 0
wanted=Sunday            00:00:00

TZ=America/Santo_Domingo - Is it OK for this to be 0:30 AM?
tStamp=Sunday 1970-10-18 17:17:17 EST 0
result=Sunday 1970-10-25 00:30:00 EHDT 1
wanted=Sunday            00:00:00

TZ=Pacific/Truk - Is it OK for this to be 10 AM?  Note: does not appear to have a DST or timezone transition.
tStamp=Thursday 1970-01-01 17:17:17 TRUT 0
result=Tuesday 1970-01-06 10:00:00 TRUT 0
wanted=Tuesday            00:00:00

TZ=Pacific/Ponape - Is it OK for this to be 11 AM?  Note: does not appear to have a DST or timezone transition.
tStamp=Thursday 1970-01-01 17:17:17 PONT 0
result=Monday 1970-01-05 11:00:00 PONT 0
wanted=Monday            00:00:00

TZ=Asia/Tbilisi - Is it OK for this to be 2 AM?
tStamp=Sunday 2005-03-20 17:17:17 GET 0
result=Sunday 2005-03-27 02:00:00 GEST 1
wanted=Sunday            00:00:00

TZ=America/Scoresbysund - Is it OK for this to be 2 AM?
tStamp=Sunday 1981-03-22 17:17:17 CGT 0
result=Sunday 1981-03-29 02:00:00 EGST 1
wanted=Sunday            00:00:00

TZ=America/Guyana - Is it OK for this to be 0:45 AM?  Note: does not appear to have a DST or timezone transition.
tStamp=Thursday 1975-07-24 17:17:17 GYT 0
result=Thursday 1975-07-31 00:45:00 GYT 0
wanted=Thursday            00:00:00

TZ=Asia/Tehran - Is it OK for this to be 0:30 AM? Note: does not appear to have a DST or timezone transition.
tStamp=Tuesday 1977-10-25 17:17:17 IRT 0
result=Tuesday 1977-11-01 00:30:00 IRT 0
wanted=Tuesday            00:00:00

TZ=Pacific/Tarawa - Is it OK for this to be Midday? Note: does not appear to have a DST or timezone transition.
tStamp=Thursday 1970-01-01 17:17:17 GILT 0
result=Monday 1970-01-05 12:00:00 GILT 0
wanted=Monday            00:00:00

TZ=Africa/Monrovia - Is it OK for this to be 00:44:30 AM? (Strange time).
tStamp=Monday 1972-04-24 17:17:17 LRT 0
result=Monday 1972-05-01 00:44:30 GMT 0
wanted=Monday            00:00:00

TZ=Asia/Katmandu - Is it OK for this to 0:15 AM?.
tStamp=Wednesday 1985-12-25 17:17:17 IST 0
result=Wednesday 1986-01-01 00:15:00 NPT 0
wanted=Wednesday            00:00:00

TZ=Pacific/Nauru - Is it OK for this to be 0:30? No DST or timezone transition.
tStamp=Tuesday 1979-04-24 17:17:17 NRT 0
result=Tuesday 1979-05-01 00:30:00 NRT 0
wanted=Tuesday            00:00:00

TZ=Pacific/Niue - Is it OK for this to be 0:30 AM? No DST or timezone transition.
tStamp=Sunday 1978-09-24 17:17:17 NUT 0
result=Sunday 1978-10-01 00:30:00 NUT 0
wanted=Sunday            00:00:00

TZ=Pacific/Port_Moresby - Is it OK for this to be 10 AM? No DST or timezone transition.
tStamp=Thursday 1970-01-01 17:17:17 PGT 0
result=Thursday 1970-01-08 10:00:00 PGT 0
wanted=Thursday            00:00:00

TZ=America/Miquelon - Is it OK for this to be 2 AM ?
tStamp=Thursday 1980-04-24 17:17:17 AST 0
result=Thursday 1980-05-01 02:00:00 PMDT 1
wanted=Thursday            00:00:00

TZ=Pacific/Palau - Is it OK for this to be 9 AM? No DST or timezone transition.
tStamp=Thursday 1970-01-01 17:17:17 PWT 0
result=Saturday 1970-01-03 09:00:00 PWT 0
wanted=Saturday            00:00:00

TZ=Pacific/Funafuti - Is it OK for this to be midday?  Note: does not appear to have a DST or timezone transition.
tStamp=Thursday 1970-01-01 17:17:17 TVT 0
result=Wednesday 1970-01-07 12:00:00 TVT 0
wanted=Wednesday            00:00:00

TZ=Pacific/Wake - Is it OK for this to be midday?  Note: does not appear to have a DST or timezone transition.
tStamp=Thursday 1970-01-01 17:17:17 WAKT 0
result=Tuesday 1970-01-06 12:00:00 WAKT 0
wanted=Tuesday            00:00:00

TZ=Pacific/Wallis - Is it OK for this to be midday?  Note: does not appear to have a DST or timezone transition.
tStamp=Thursday 1970-01-01 17:17:17 WFT 0
result=Tuesday 1970-01-06 12:00:00 WFT 0
wanted=Tuesday            00:00:00

TZ=America/Paramaribo - Is it OK for this to be 0:30 AM?  Note: does not appear to have a DST or timezone transition.
tStamp=Monday 1984-09-24 17:17:17 SRT 0
result=Monday 1984-10-01 00:30:00 SRT 0
wanted=Monday            00:00:00

ludo:~/tmp/php-5.1-dev/php5-200506201830/sapi/cli# 
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