Menu bar shows that macOS Sierra very frequently uses location services to check the time zone even though Setting Time Zone is disabled
I had the same issue on macOS 10.12.6. Give this a try:
- Under System Preferences > Date & Time > Time Zone: Uncheck "Set time zone automatically using current location"
- Disable location services completely
- Delete the file "/Library/Caches/com.apple.AutoTimeZone.plist"
- Reenable location services again
- Restart your computer
Does it solve your issue? Source