Send emails without issue in UTC time diffrnet

Dear All

 

I have done an application which runs on C#. The application does hotel room booking send cancelation details. But I am having an issue in UTC time.

Example: Hotel in Sri Lanka and client in the USA. But application runs on Singapore server. These three countries time difference I am unable to send email exact date. email sending server in UTC time +8:00 and Hotel in UTC +5:30 and client in UTC -6:00.