Hi Jigar,
I got a bit lost in your explanation. But from what I understood your server time is UTC and your clients are in AEDT.
If this is the case you need to convert the date to utc before doing the check for the today's date. You do that with the timezone component.
You can look into this forge component to understand how to handle time zones.
If this is not the case can you explain me the differences from my assumptions.
Regards,
Marcelo