Juan, can you please check what is your JIRA server timezone and your Account profile's timezone configuration.
Reference: https://confluence.atlassian.com/jira/choosing-a-time-zone-236587466.html
Nice guess. A date that doesn't specify a time defaults to 00:00 hours. So, even a difference of just one hour between server's and user profile's time zones might produce those distinct dates.
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Are you using a custom field? How did you enter the date exactly: by using your keyboard or by selecting it on a calendar?
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