I wonder exactly when the update on April 21st will start? I know Google is an Ireland-based company, does it start at 00:00 according to Ireland time? Does anyone have exact information?
Anything can happen at any moment 
The current time at Google’s headquarters is as below
08:13 Monday (PDT) - Mountain View, California, United States Time
The reason for announcing this update beforehand is that it is not an update aimed at those who mislead it or manipulate rankings
I would appreciate it if someone with detailed information about the update could write… explaining what should be done and how…