What are the release dates for Trigun - 1998 Roppyaku-oku dabudoru no otoko - 1.1?

What are the release dates for Trigun - 1998 Roppyaku-oku dabudoru no otoko - 1.1?
Trigun - 1998 Roppyaku-oku dabudoru no otoko - 1.1 was released on:

Japan: 1 April 1998
USA: 31 March 2003 (English version)