I have a data frame that looks like this:

[![enter image description here](https://i.stack.imgur.com/4dCkK.jpg)](https://i.stack.imgur.com/4dCkK.jpg)

How can I make a new data frame that contains only the minimum 'Time' values for a user on the same date?

So I want to have a data frame with the same structure, but only one 'Time' for a 'Date' for a user.

So it should be like this:

[![enter image description here](https://i.stack.imgur.com/Hwzco.jpg)](https://i.stack.imgur.com/Hwzco.jpg)