When using calling time.Now() multiple times, they can cross
month boundary causing errors in calculations.
Change-Id: I66b5be7598f3bf475b4b5fe0dcce82eee55b3134
On servers with non-UTC it would have calculated a different month boundary.
If node joined in current month calculations will be related on amount of days node've been working.
Change-Id: Ie572b197f50c6cdff5a044a53dfb5b9138f82f24