Google Calendar screams all over the world due to system failure

With ' Google Calendar ' provided by Google , a system failure occurs from around 23:00 on June 18, 2019 to around 2 on 19: 2019. The system went down worldwide, and even if it accessed, a 404 error would be returned. At the time of article creation, Google Calendar has already been restored.
G Suite Status Dashboard

[Update: Back to work!] Google Calendar is down, so forget about your next meeting and go to the beach instead
https://www.androidpolice.com/2019/06/18/google-calendar-is-down-so-forget-about-your-next-meeting-and-go-to-the-beach-instead/
Google Calendar is down, it's not just you — Update: It's back | TechCrunch
https://techcrunch.com/20019/06/18/google-calendar-is-down-its-not-just-you/
When I accessed calendar.google.com at around 23:22 on June 18, 2019, I received a 404 error. Although the Google Calendar app works at the local level, the ability to sync added events online has been completely stopped.
# googlecalendardown the world is coming to an end. NOOOOOOO! pic.twitter.com/jQCSSVuyPf
— Yaron Hadad (@ yaronhadad) June 18, 2019
At 23:39 on the same day, G Suite's official Twitter account announced that the Google Calendar system was down.
Please stay tuned for updates or follow here: https://t.co/2SGW3X1cQn Google Calendar is currently experiencing a service disruption.
— G Suite (@gsuite) June 18, 2019
The system down was affected in multiple regions around the world, and Japanese users also reported that 'the Google calendar can not be synchronized'.
I think that the calendar will not synchronize if I try to adjust the schedule of tomorrow,
— Jun CIO / CDO @ DX Promotion Committee (@SEntertainer) June 18, 2019
I think the problem of my terminal,
I tried on a variety of terminals such as smartphones and tablets are not synchronized, what is this? If I open my PC and think # Google Calendar
It was 404 or 503 ...
Is it down? # Googlecalendardown
The Google Calendar went down in Japan at around 23 o'clock in the middle of the night, but in Eastern Standard Time at around 9 o'clock in the morning when work starts in one day. Therefore, screams were heard from users who use Google Calendar to manage work schedule.
'I'm not upset. I'm calm. It's over. Goodbye.'
I am not panicking.
— Goffredo Puccetti (@goffredodotcom) June 18, 2019
I am calm.
It is over.
Goodbye. #Googlecalendar #googlecalendardown pic.twitter.com/RKaTmT26zZ
'Because Google Calendar is down, we will be late for today's meeting'
Me being late to all my meetings today because Google Calendar is down # google Calendar Down pic.twitter.com/LDstQwyvx0
— Elba Genao ????????? (@ElbaGenao) June 18, 2019
'Can I get bonus points if I can join a meeting without the help of Google Calendar?'
So do we get bonus points if we show up to meetings without the help of Google Calendar? # 404meetingnotfound
— Cathlene Silha (@ Cathlene Silha) June 18, 2019
'As part of Google's' Don't Be Evil 'code of conduct, Google has deleted the Google Calendar. You no longer need to attend meetings.'
As part of Google's 'Don't Be Evil' strategy they've deleted Google Calendar, you no longer have to attend meetings. Pic.twitter.com/AkvsX1qYSb
— Kevin Beaumont ???? (@GossiTheDog) June 18, 2019
The G Suite Status Dashboard will notify you at 1:40 on June 19, 2019 that 'the issue affecting most users of Google Calendar will be resolved on 20/19/19 2:40' On the same day, it was announced at 2:13 on the same day that 'The problem with Google Calendar has been resolved'. At the time of writing, Google has not clarified the specific cause of this system down.
in Web Service, Posted by log1i_yk