Can system logs tell me when I closed my Macbook? I'm trying to figure out how late I've been working for the last few months.

Normally my old line manager would not have given me time in lieu. However she was fired last week and I now stand a chance of getting some time back from the company.

The best measurement of when I stop work is when I last close my macbook each day. Could I find this out from the sys logs?
The last message before I opened my MacBook this morning was

5/19/19 22:43:36.000 kernel[0]: AirPort_Brcm43xx::powerChange: System Sleep 


I'm not sure I closed it at that time exactly last night but it was close.

I've just run an experiment now and it took about 15 seconds from my last activity before I close the lid until that message appears.