PRB: LocalFileTimeToFileTime may not Return Correct UTC Time (180104)
The information in this article applies to:
- Microsoft Extended Messaging Application Programming Interface (MAPI)
This article was previously published under Q180104 SYMPTOMS
The LocalFileTimeToFileTime() function in Mapi.dll may not return the
correct time when the function is executed on a computer running Windows 95
or Windows NT.
CAUSE
The 16-bit version of the LocalFileTimeToFileTime function in Mapi.dll gets
time zone information from the Win.ini file instead of the registry.
RESOLUTION
The time zone information is not written to the Win.ini file in Windows 95
or Windows NT. However, you may add the time zone information to the
Win.ini file. The information to be added is at the following location in
the registry:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\TimeZoneInformation
You need to modify the Win.ini file by adding the following section:
The user needs to copy the values and data for each entry in the registry
key listed above to a separate line into this section of the Win.ini. The
end user should then have a Win.ini file that has the following section
with similar data as shown below:
[MAPI 1.0 Time Zone]
Bias=12c
StandardName=Eastern Standard Time
StandardBias=0
StandardStart=00000A00050002000000000000000000
DaylightName=Eastern Daylight Time
DaylightBias=ffffffc4
DaylightStart=00000400010002000000000000000000
ActiveTimeBias=12c
STATUS
This behavior is by design.
MORE INFORMATION
LocalFileTimeToFileTime() is used to convert a local file time to a file
time based on the Coordinated Universal Time (UTC). The function uses the
current computer settings for the time zone and daylight saving time.
| Modification Type: | Minor | Last Reviewed: | 8/18/2005 |
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| Keywords: | kbMsg kbprb KB180104 |
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