Is there a way to view a log showing "Which users have logged into my device with date and time?

Similar questions have been asked in the past. The single bay My Cloud units officially do not have such a feature. Unofficially one may be able to look at the log(s) and devine some of that information. One can use the forum search feature, magnifying glass icon upper right, to find various past discussions. Here are a few:

https://community.wd.com/t/wd-user-access-logs/201194/

https://community.wd.com/t/does-access-log-exist-for-my-cloud/149045

https://community.wd.com/t/user-access-log/182193