Converting Date & Time To UTC

Hi All

I need help trying to convert a Date and Time column from AEST (Melbourne, Australia) into UTC

For example:

Local time AEST
Start: 12 Jul 2021 4:00 AM
End: 12 Jul 2021 6:00 AM

UTC time:
Start 11 Jul 2021 6:00 PM
End: 11 Jul 2021 8:00 PM

Thank you!