How to reproduce:

• In solr search tool
  • Search for News content type
  • Add start-date and end-date columns
• Modifiy the start-date to put it after the existing end-date
  • Save your modification
  • There is no error, the modification are saved => KO
• Modifiy the start-date AND the end-date with a start-date after the end-date
  • Save your modification
  • An error appears, you can't save the content => OK