Formatting a date time string read from a csv file

[DosAtPython]

L.S.,

I'm rather new to python-programming. I'm trying to remove the time info from a date time string read from a csv-file. My impression is that to achieve this, I have to use the strptime() function.

The test-script i'm using:

from datetime import datetime

my_datetime ='2023-06-15 07:26:50'
my_date = datetime.strptime(my_datetime, '%Y-%m-%d' )
print(my_date)

The error message I get in line 4:

Error:
File "/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/_strptime.py", line 352, in _strptime
    raise ValueError("unconverted data remains: %s" %
ValueError: unconverted data remains:  07:26:50

What I want to achieve is that 'my_date' contains the string '2023-06-15' without the time info of 'my_datetime'.

Who can help me with this issue?
Thanks in advance