Running Clock in Excel with different Time Zone

Need running clock in Excel... in A1 I have put running clock which is taking current system time. However, I want to add running clocks for EST in B1 - CST in C1 and PST in D1. Any help much appreciated.

Atatching excel... if anyone can update in same and attach back, will be very thankful.

VB code I used to display current system running clock

Global clockOn As Boolean
Sub runClock()
Range("A1").Value = Now()
If clockOn = True Then
Application.OnTime Now + TimeValue("00:00:01"), "runClock"
End If
End Sub
Sub startClock()
clockOn = True
runClock
End Sub
Sub stopClock()
clockOn = False

End Sub