I.M tips on campaign launch

Here's a tip that I would like to share before launching any campaigns. If I am going to launch a campaign now in the US, how will I know if it is the right timing and effective to do it now? What I will do now is to check the timing in USA. Here's how I do it:
I will scroll down to the bottom right of my desktop screen.

Change date and time settings.

Once I click change time zone, I can see the actual timings in various countries.

So if I launch a campaign here now in Singapore, but target audience are US traffic. The timing will be 12:34AM (15 hours behind). Do you think there will be enough activities and impressions for your campaign? You can use this method for other countries as well! Cheers!