Product:
Planning Analytics 2.0.5
Microsoft Windows server 2016

Problem:
When open the tm1server.log file, the time is 2 hour off the local time or so. This is because default all tm1 logging is done in GMT time.

Solution:
Create a tm1s-log.properties file with below content and place it in same folder as your tm1s.cfg file.

#
# Enable INFO level logging through the shared memory appender, by default. The server # will write informational messages, as well as errors and warnings to the log file.
#

log4j.logger.TM1=INFO, S1

# S1 is set to be a SharedMemoryAppender
log4j.appender.S1=org.apache.log4j.SharedMemoryAppender
# Specify the size of the shared memory segment
log4j.appender.S1.MemorySize=5 MB
# Specify the max filesize
log4j.appender.S1.MaxFileSize=100 MB
# Specify the max backup index
log4j.appender.S1.MaxBackupIndex=20
# Specify GMT or Local timezone
log4j.appender.S1.TimeZone=Local
# adds info about process locks to the tm1 server log file
Log4j.logger.TM1.Lock.Exception=DEBUG

More Information:

https://www-01.ibm.com/support/docview.wss?uid=swg22003062

http://www.tquate.com/blog/configuring-and-enabling-logging-tm1/
https://exploringtm1.com/changing-tm1-server-log-time-zone-stamp/
https://www-01.ibm.com/support/docview.wss?uid=swg21459102