As the 13th of September 1998 was the day before the 14th of September 1998, then the difference is minus one day.
September 14, 1998 fell on a Monday.
The Avengers - 1998 was released on: Israel: 13 August 1998 Canada: 14 August 1998 Ireland: 14 August 1998 Malaysia: 14 August 1998 South Africa: 14 August 1998 Sweden: 14 August 1998 UK: 14 August 1998 USA: 14 August 1998 France: 19 August 1998 Singapore: 20 August 1998 Belgium: 26 August 1998 Germany: 27 August 1998 Austria: 28 August 1998 Brazil: 28 August 1998 Switzerland: 28 August 1998 (German speaking region) Netherlands: 3 September 1998 Finland: 4 September 1998 Portugal: 4 September 1998 Philippines: 9 September 1998 (Manila) Taiwan: 11 September 1998 Thailand: 11 September 1998 Slovenia: 17 September 1998 Denmark: 18 September 1998 Greece: 23 September 1998 Philippines: 23 September 1998 (Davao) New Zealand: 24 September 1998 Mexico: 25 September 1998 Spain: 25 September 1998 Kuwait: 30 September 1998 Turkey: 2 October 1998 Japan: 3 October 1998 South Korea: 3 October 1998 Slovakia: 8 October 1998 Poland: 9 October 1998 Hungary: 15 October 1998 Italy: 30 October 1998 Australia: 5 November 1998 Estonia: 6 November 1998 Iceland: 13 November 1998 Indonesia: 28 November 1998 (Jakarta) Argentina: 20 January 1999 (video premiere)
September 13-14 1814 September 13-14 1814
Monday
As the World Turns - 1956 1998-09-14 was released on: USA: 14 September 1998
Politically Incorrect - 1993 1998-09-14 was released on: USA: 14 September 1998
All My Children - 1970 1998-09-14 was released on: USA: 14 September 1998
Such a Long Journey - 1998 was released on: Canada: 13 September 1998 (Toronto International Film Festival) (premiere) New Zealand: 14 July 1999 (Auckland Film Festival) UK: 15 October 1999 USA: 24 March 2000 (limited) Iceland: 21 November 2004 (Reykjavik International Film Festival)
The Charlie Rose Show - 1991 1998-09-14 was released on: USA: 14 September 1998
Rude Awakening - 1998 Telltale Heart 3-13 was released on: USA: 14 September 2000 France: 5 May 2002 Hungary: 11 January 2009
1998 was 14 years ago
Hollywood Squares - 1998 was released on: USA: 14 September 1998