This new Gmail Labs feature is very useful if you ever work with people from different regions. You want to reply to them, but you want them to read this immediately while they’re in front of computer, instead of stack up on him mailbox, and only being read when they comeback tomorrow morning.
That’s how Sender Time Zone will be able to assist you.
Once you enable it from Gmail Labs , all emails in mailbox will have additional information called ‘sender-time’ once you ‘click ‘show detail’.
So now you know when this email has been sent and the time over there now. So do you still want to call them in the middle of the night??