Here is a very useful script for auto timezone update ( will enable location service) and time update from JAMF Nation:
https://jamfnation.jamfsoftware.com/discussion.html?id=13723
#!/bin/sh #Use "/usr/sbin/systemsetup -listtimezones" to see a list of available list time zones. #This script is meant to be used with Casper. # $4 variable should be filled with the TimeZone information (ie: America/Chicago, America/New_York ) # $5 variable should be filled with the TimeServer information (ie: time.apple.com ) TimeZone="$4" TimeServer="$5" ############# Pause for network services ############# /bin/sleep 10 ###################################################### #Disable network time /usr/sbin/systemsetup -setusingnetworktime off #Set an initial time zone /usr/sbin/systemsetup -settimezone "$TimeZone" #Set specific time server /usr/sbin/systemsetup -setnetworktimeserver "$TimeServer" # enable location services /bin/launchctl unload /System/Library/LaunchDaemons/com.apple.locationd.plist uuid=`ioreg -rd1 -c IOPlatformExpertDevice | awk -F'"' '/IOPlatformUUID/{print $4}'` /usr/bin/defaults write /private/var/db/locationd/Library/Preferences/ByHost/com.apple.locationd."$uuid" LocationServicesEnabled -int 1 /usr/bin/defaults write /private/var/db/locationd/Library/Preferences/ByHost/com.apple.locationd.notbackedup."$uuid" LocationServicesEnabled -int 1 /usr/sbin/chown -R _locationd:_locationd /var/db/locationd /bin/launchctl load /System/Library/LaunchDaemons/com.apple.locationd.plist # set time zone automatically using current location /usr/bin/defaults write /Library/Preferences/com.apple.timezone.auto Active -bool true #Re-enable network time /usr/sbin/systemsetup -setusingnetworktime on #Detect the timezone /usr/sbin/systemsetup -gettimezone #Get the time from time server /usr/sbin/systemsetup -getnetworktimeserver exit 0