Cash back activities

Wanna ask when Cash back activities start to count?

The event image has shown in game, received the event mail and Forum said start from 21st,

It means start at 21st 0:00 am server time right?

But on the login in page, it shows start at 6:00am,(shown as photo)

Which time is right?

I have already purchased 28 matal packages after 21st 0:00am server time,

Will it count?

My ally and I have spent a lot already... I think a lot of people did. who can I ask 😱😱