The .* will match everything after the :, including the space and the time. To get just the date, be more specific than a wildcard that matches any character. Use this pattern:
#(\d{2}/\d{2}/\d{4})#
Capture group #1 will contain the date.
You tagged it as only regex and not php, but in PHP that would be:
preg_match('#(\d{2}/\d{2}/\d{4})#', $string_containing_the_sentence)
and the date will be assigned to $1.
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solved How to select a date using regex [closed]