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| Description of updates to APIs that enable Windows-based applications to retrieve historically accurate time stamps |
This article describes updates to APIs that enable Windows-based applications to retrieve historically accurate time stamps.
Go to Microsoft's website for complete details: http://support.microsoft.com/kb/960417
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What time functions are updated? The following time functions are updated by this update:- SystemTimeToTzSpecificLocalTime() Converts a time in Coordinated Universal Time (UTC) to a specified time zone's corresponding local time.
- TzSpecificTimeToSystemTime() Converts a local time to a time in Coordinated Universal Time (UTC).
Note
The functions that are listed here use a TIME_ZONE_INFORMATION
structure that specifies the START DATE and the END DATE for daylight
saving time (DST). By default, the current DST rules are used when no
such structure is provided.When to use these functions in an application
Most date and time stamps that are created and displayed in Windows and
in many applications are stored as UTC. Then, they are rendered in
local time by using system APIs. Examples of these include Windows file
time stamps, Outlook sent and received dates, and event logging time
stamps.
Not all built-in, Windows-based applications use these
newly updated APIs. However, they are available to all applications,
including third-party applications. These functions are useful in many
scenarios, such as a user auditing scenario in which the ability to use
DST rules for previous years on a current Windows service pack is
important.
Generally, if an application requires historically accurate time stamps, these functions should be used.
Go to Microsoft's website for complete details: http://support.microsoft.com/kb/960417
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Article Details
Last Updated
30th of October, 2009
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