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04-12-2007 08:32 AM
04-12-2007 08:32 AM
VMS Timezone/TDF Question
Hello all,
On 4/1/07 (date of the old DST change) our Oracle sysdate reported +1 hour ahead of the current VMS system time. We found the Time Differential Factor (TDF) was set to -6h instead of the correct -5h offset.
I found that Oracle's sysdate function uses TDF to calculate it's time, but shouldn't the Oracle sysdate have been 1 hour behind instead of 1 hour ahead??
Our AUTO_DLIGHT_SAV is set to "0" so no automatic change should have occurred. Setting the TDF correctly to -5h corrected the problem but sure doesn't seem like this could happen.
Version Info: We are running OpenVMS 7.3-1 and Oracle 8.1.6.
Anyone…Anyone…Bueller…Bueller??
On 4/1/07 (date of the old DST change) our Oracle sysdate reported +1 hour ahead of the current VMS system time. We found the Time Differential Factor (TDF) was set to -6h instead of the correct -5h offset.
I found that Oracle's sysdate function uses TDF to calculate it's time, but shouldn't the Oracle sysdate have been 1 hour behind instead of 1 hour ahead??
Our AUTO_DLIGHT_SAV is set to "0" so no automatic change should have occurred. Setting the TDF correctly to -5h corrected the problem but sure doesn't seem like this could happen.
Version Info: We are running OpenVMS 7.3-1 and Oracle 8.1.6.
Anyone…Anyone…Bueller…Bueller??
2 REPLIES 2
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04-12-2007 08:49 AM
04-12-2007 08:49 AM
Re: VMS Timezone/TDF Question
The calculation is based upon the value of the SYS$TIMEZONE_RULE logical. If you have applied the patch it will have a value of "EST5EDT4,M3.2.0/02,M11.1.0/02", if you haven't applies the patch it will have a value of "EST5EDT4,M4.1.0/02,M10.5.0/02".
(The example I gave is for the eastern timezone, the appropriate values get substituted for the first string in other timezones.)
(The example I gave is for the eastern timezone, the appropriate values get substituted for the first string in other timezones.)
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04-12-2007 12:27 PM
04-12-2007 12:27 PM
Re: VMS Timezone/TDF Question
Fix your TZs, and check your Oracle version as Oracle has/had its own DST, check your Java as it has/had its own DST, etc...
Details on this DST effort -- everything that has surfaced out of this particular little adventure -- are included at:
http://64.223.189.234/node/72
And DST-related materials are listed at:
http://64.223.189.234/taxonomy/term/57
Stephen Hoffman
HoffmanLabs LLC
Details on this DST effort -- everything that has surfaced out of this particular little adventure -- are included at:
http://64.223.189.234/node/72
And DST-related materials are listed at:
http://64.223.189.234/taxonomy/term/57
Stephen Hoffman
HoffmanLabs LLC
The opinions expressed above are the personal opinions of the authors, not of Hewlett Packard Enterprise. By using this site, you accept the Terms of Use and Rules of Participation.
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