Dates for Drupal 7 and 8 end of life and Drupal 9 release(dri.es)
dri.es
Dates for Drupal 7 and 8 end of life and Drupal 9 release
https://dri.es/drupal-7-8-and-9
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The tldr is Drupal 7/8 end of life by November 2021 and Drupal 9 released before then.