Calandar date error in data usage

[AC Question]

Since today, my cycle in data usage is getting an error. Usually is from the 16h to 15th of next month.
This month, when the cycle renew, the date that needed to be the 15h of October, this time was the date 31 December 1969. Anyone knows something about this? Is it a problem with the OS or is something else?

Thanks in advance!

 

[Itiamagu]

Since today, my cycle in data usage is getting an error. Usually is from the 16h to 15th of next month.
This month, when the cycle renew, the date that needed to be the 15h of October, this time was the date 31 December 1969. Anyone knows something about this? Is it a problem with the OS or is something else?

Thanks in advance!

Edit: It's Android 6.0.1 at a Nexus 5.