lucky date for signing a contract

When I look up a lucky date on the calendar on the website, I always wonder if I need to adjust the date for the time difference. For example, Beijing China is 7am on the 6/24 now, and it's 4pm on 6/23 here in California. I'm about to sign a contract, and according to the calendar on the website, it's not good to sign a contract on 6/24. Maybe I should just wait till 6/25, but it's good to know how to read the calendar correctly. Thank you so much,