How to run a scheduler on different time zones like UTC, GMT, PST, MST, EST, CST etc..

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C#

.NET

webservice

I have a database of different users from different countries who had registered in our application. There might be the users having friends in different countries.

Say, there are 3 users A, B,C. A is in India, B is in San Francisco and C is in Italy and A, B, C all three are friends.

A's birthday is on 29/08/2014.
So, on 29/08/2014 at 12:00:00 AM (A's time zone), i need to send B & C the A's birthday notification via server with respect to A's time zone.

In case if i had chosen to run a scheduler everyday at 12:00:00 AM server time, it might not be the same as A's time zone. It might be few minutes before or after the A's time zone. But i need to send the notification only at A's time zone.

I need to achieve this functionality. I would be very glad if someone can please help me.

Please help me in achieving this functionality.

Thanks in advance.

Suresh