Userform Label in HH:MM to determine User Shift in Unload

My userform has Label1 that is the start time of a selected certain action. When the form is unloaded, I am trying to determine the shift by the start time of when the action began with the following code, but I dunno where I'm going wrong? I try to keep everything on the 24 hour clock. My result is a blank cell.

The userform accepts the input from the following code:

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This is the CommandButton1_Click code:

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Any help is much appreciated. Thanks ahead of time!

Luke