The TZONES2U function converts a SAS datetime value to a UTC (Coordinated Universal Time) datetime value. In the example below, the time zone is set to America/Mexico City, and UTC is six hours ahead of Mexico City.

Mexico City ended the use of Daylight Savings Time in 2022, so the result below is incorrect by one hour. The Startdatetime1 variable is computed with the DHMS function. Then, the TZONES2U function adjusts the Startdatetime1 variable for Mexico City. Since SessionStartTime is set to 8:00, the newly computed Startdatetime1 value should be 14:00, which is six hours ahead. However, the computed Startdatetime1 value is 03JUL23:13:00:00.

Here is an example:

data _null_;
   CourseStartDate = '03JUL23'd;
   SessionStartTime = '08:00't;
   Timezone1 = 'America/Mexico_City';
   Startdatetime1 = tzones2u(dhms(CourseStartDate,0,0,SessionStartTime),timezone1);
   format CourseStartDate date9. SessionStartTime time. Startdatetime1 datetime.;
   put _all_;
run;

Click the Hot Fix tab in this note to access the hot fix for this issue.

Operating System and Release Information

Product Family	Product	System	Product Release		SAS Release
			Reported	Fixed*	Reported	Fixed*
SAS System	Base SAS	z/OS	9.4_M7
		z/OS 64-bit	9.4_M7
		Microsoft® Windows® for x64	9.4_M7
		Microsoft Windows 8 Enterprise 32-bit	9.4_M7
		Microsoft Windows 8 Enterprise x64	9.4_M7
		Microsoft Windows 8 Pro 32-bit	9.4_M7
		Microsoft Windows 8 Pro x64	9.4_M7
		Microsoft Windows 8.1 Enterprise 32-bit	9.4_M7
		Microsoft Windows 8.1 Enterprise x64	9.4_M7
		Microsoft Windows 8.1 Pro 32-bit	9.4_M7
		Microsoft Windows 8.1 Pro x64	9.4_M7
		Microsoft Windows 10	9.4_M7
		Microsoft Windows 11	9.4_M7
		Microsoft Windows 95/98	9.4_M7
		Microsoft Windows 2000 Advanced Server	9.4_M7
		Microsoft Windows 2000 Datacenter Server	9.4_M7
		Microsoft Windows 2000 Server	9.4_M7
		Microsoft Windows 2000 Professional	9.4_M7
		Microsoft Windows NT Workstation	9.4_M7
		Microsoft Windows Server 2003 Datacenter Edition	9.4_M7
		Microsoft Windows Server 2003 Enterprise Edition	9.4_M7
		Microsoft Windows Server 2003 Standard Edition	9.4_M7
		Microsoft Windows Server 2003 for x64	9.4_M7
		Microsoft Windows Server 2008	9.4_M7
		Microsoft Windows Server 2008 R2	9.4_M7
		Microsoft Windows Server 2008 for x64	9.4_M7
		Microsoft Windows Server 2012 Datacenter	9.4_M7
		Microsoft Windows Server 2012 R2 Datacenter	9.4_M7
		Microsoft Windows Server 2012 R2 Std	9.4_M7
		Microsoft Windows Server 2012 Std	9.4_M7
		Microsoft Windows Server 2016	9.4_M7
		Microsoft Windows Server 2019	9.4_M7
		Microsoft Windows Server 2022	9.4_M7
		Microsoft Windows XP Professional	9.4_M7
		Windows 7 Enterprise 32 bit	9.4_M7
		Windows 7 Enterprise x64	9.4_M7
		Windows 7 Home Premium 32 bit	9.4_M7
		Windows 7 Home Premium x64	9.4_M7
		Windows 7 Professional 32 bit	9.4_M7
		Windows 7 Professional x64	9.4_M7
		Windows 7 Ultimate 32 bit	9.4_M7
		Windows 7 Ultimate x64	9.4_M7
		Windows Millennium Edition (Me)	9.4_M7
		Windows Vista	9.4_M7
		Windows Vista for x64	9.4_M7
		64-bit Enabled AIX	9.4_M7
		64-bit Enabled Solaris	9.4_M7
		HP-UX IPF	9.4_M7
		Linux for x64	9.4_M7
		Solaris for x64	9.4_M7

* For software releases that are not yet generally available, the Fixed Release is the software release in which the problem is planned to be fixed.

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A fix for this issue for SAS Threaded Kernel Core Routines 9.4_M8 is available at:

https://tshf.sas.com/techsup/download/hotfix/HF2/L8Y.html#70271

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A fix for this issue for SAS Threaded Kernel Core Routines 9.4_M7 is available at:

https://tshf.sas.com/techsup/download/hotfix/HF2/I8E.html#70271

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Mexico City ended the use of Daylight Savings Time in 2022, so the TZONES2U function returns a value that is one hour different than expected.

Type:	Problem Note
Priority:	medium
Topic:	SAS Reference ==> Functions ==> Date and Time

Date Modified:	2023-07-28 09:05:13
Date Created:	2023-07-24 12:59:49