IIS log time is in GMT/UTC, how to change to local time?
Jul 26, 2025 am 04:04 AM
The default logging time of IIS is UTC, which can be converted to local time by modifying the registry, using PowerShell scripts, or log analysis tools. 1. Modify the registry to IIS 6-7 UseLocalTime value to 1 and restart IIS; 2. Use PowerShell scripts to read the log and convert the time fields; 3. Use tools such as LogParser to automatically convert the time during import. Pay attention to backing up the registry, confirming that the server time zone is correct, and keeping the time uniform in a multi-server environment.
The default time for logging in IIS is GMT/UTC. This may cause some trouble if the server is not in the local time zone when troubleshooting problems or analyzing access behavior. Fortunately, there is a way to make the IIS log time display as your local time.
Modify registry settings (for IIS 6 and above)
If you are using older versions of IIS (such as IIS 6 and 7), you can change the time zone of the log time by modifying the registry.
- Open Registry Editor (regedit)
- Find the path:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W3SVC\Parameters - Create a new DWORD value, name it
UseLocalTime, set the value to1 - Restart the IIS service to make the changes take effect
This method works for most traditional IIS versions, but does not work with some updated versions of IIS 10, as Microsoft removes support for UseLocalTime in subsequent versions.
Convert log time using PowerShell scripts
If you don't want or cannot modify the server settings, another way is to use a script to convert the time to local time after the log is generated. For example, using PowerShell:
Get-Content C:\inetpub\logs\LogFiles\W3SVC1\u_ex231001.log | ForEach-Object {
if ($_ -match '^#') {
$_
} else {
$fields = $_.Split(' ')
$utcTime = [datetime]::ParseExact("$($fields[0]) $($fields[1])", "yyyy-MM-dd HH:mm:ss", $null)
$localTime = $utcTime.ToLocalTime()
$fields[0] = $localTime.ToString("yyyy-MM-dd")
$fields[1] = $localTime.ToString("HH:mm:ss")
$fields -join ' '
}
} This script reads the log file, recognizes the time field, converts it from UTC to local time, and then outputs the processed content. You can save it as a .ps1 file to run regularly, or integrate it into the log analysis process.
Automatic time conversion using log analysis tool
If you use log analysis tools such as LogParser, ELK, Splunk, or Graylog, these tools usually support time conversion when importing logs. For example, in LogParser, you can use a statement like this:
SELECT TO_LOCALTIME(TO_TIMESTAMP(date, time)) AS LocalTime, * FROM ex231001.log
This way you can see the local time in the query results without modifying the original log file.
Things to note
- Be sure to back up the registry before modifying it
- Make sure the server's time zone settings are correct, otherwise it may not be accurate even if converted to "local time".
- If it is a multi-server environment, it is important to unify the time format and time zone to avoid confusion when troubleshooting problems
Basically these methods. Different versions of IIS support methods are slightly different, just choose the one that is most suitable for your current environment.
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