July 12, 2017. Just late enough to miss Athena (now fixed), but a full six weeks too late for Hel (still AWOL).
Level 55, 28 4th-tier 5*.
Toughest titan slain: 14* armored hydra
Toughest war opponent defeated: 7 Days Departed (today! Yeah, 7 Days Forever! 
)
There was an older thread on this, but I’ll refrain from necro’ing that one: How long have I played? / When did I install the game?
This post tells you how to find the info in iOS: How long have I played? / When did I install the game? - #9
And this one for Android: How long have I played? / When did I install the game? - #5