What does +1 means beside the date

• 4 December 2011 at 12:18pm
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  Guest: Sarah

  Unregistered user
  Anybody knows what does +1 means beside the date?
• 4 December 2011 at 5:52pm
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  Dover.UK.com

  Location: Dover
  Posts: 7
  Hi Sarah...
  
  The '+1' just indicates that the swim went over into the next day. There are some +2s and +3s in there aswell!