Only Customer Support can help with this. Use the link to contact them. It is important that you write the date when your travel starts so that your request can be correctly prioritised.

https://eurail.zendesk.com/hc/en-001/requests/new

Its likely that 1 day later/eariler again?

That is why we always advize to NOT start it all untill you are in EUR and on that day. The system sets timings-and thus also sometimes dates, to that here in EUR at that time- IF you did that in India early morn it may still have been day before in EUR