There are 2 types of ecards that you can send from 123greetings.com,
If you choose an ecard to be sent on the same date, then these ecards are delivered instantly and there is no time difference/ time zone that comes into effect.
If you choose an ecard to be sent at a later date, you will be provided with an option to select the country where the receiver is based. The ecard will be delivered so that the receiver gets the ecard early in the morning in his / her own timezone. Our postmaster does all the scheduling for you, so you need not do the math.
However, if you don't select a country, or are not provided an option to select a country (say when sending 50 cards at the same time), then these ecards are sent based on the sender's country.