Board Thread:Eureka Moments/@comment-30638141-20170203001442/@comment-92.18.198.152-20171219001516

Time travelling is just a matter of changing the time and/or date on your device. By this means you can replenish your energy, reset your trophies, reset your gift counters, reset your desk guardian - and thus collect bonuses and send gifts more often than the game would normally allow.

There is a very long thread relating to this somewhere on the forum. It contains some outdated info, but also very useful instructions.