Subject: bug#31113: mcron ERROR: In procedure mktime:

From: Rutger Helling <[email-masked]>
Date: Tue, 10 Apr 2018 18:41:08 +0200

I had this problem too. 

Reverting commit cfbf6de18cc70d2e385feb5f61f9363f18e78ddf (gnu: mcron:
Update to 1.1 and deprecate "mcron2".) fixed it for me.