Puppet Manifest to set the timezone in the system.

timezone.pp

file { '/etc/timezone':
        ensure => present,
        content => "Europe/Berlin\n",
}

exec { 'reconfigure-tzdata':
        user => root,
        group => root,
        command => '/usr/sbin/dpkg-reconfigure --frontend noninteractive tzdata',
}

notify { 'timezone-changed':
        message => 'Timezone was updated to Europe/Berlin',
}

File['/etc/timezone'] -> Exec['reconfigure-tzdata'] -> Notify['timezone-changed']