Summary of DST in 2003 Worldwide
North America
| Country | Start of DST | End of DST |
| Bermuda | 2003-4-6 | 2003-10-26 |
| Canada | 2003-4-6 | 2003-10-26 |
| Cuba | 2003-4-6 | 2003-10-26 |
| Greenland | 2003-3-29 | 2003-10-25 |
| Mexico | 2003-4-6 | 2003-10-26 |
| Saint Pierre and Miquelon | 2003-4-6 | 2003-10-26 |
| The Bahamas | 2003-4-6 | 2003-10-26 |
| Turks and Caicos Islands | 2003-4-6 | 2003-10-26 |
| United States | 2003-4-6 | 2003-10-26 |
Oceania
| Country | Start of DST | End of DST |
| Australia | 2003-10-26 | 2003-3-30 |
| New Zealand | 2003-10-5 | 2003-3-16 |
South America
| Country | Start of DST | End of DST |
| Brazil | 2003-10-19 | 2003-2-15 |
| Chile | 2003-10-12 | 2003-3-8 |
| Falkland Islands | 2003-9-7 | 2003-4-20 |
| Paraguay | 2003-9-7 | 2003-4-5 |
Africa
| Country | Start of DST | End of DST |
| Burkina Faso | 2003-10-19 | 2003-2-15 |
| Egypt | 2003-4-25 | 2003-9-25 |
| Namibia | 2003-9-7 | 2003-4-6 |
Asia
| Country | Start of DST | End of DST |
| Armenia | 2003-3-30 | 2003-10-26 |
| Azerbaijan | 2003-3-30 | 2003-10-26 |
| Cyprus | 2003-3-30 | 2003-10-26 |
| Georgia | 2003-3-30 | 2003-10-25 |
| Iran | 2003-3-22 | 2003-9-21 |
| Iraq | 2003-4-1 | 2003-10-1 |
| Israel | 2003-3-28 | 2003-10-3 |
| Jordan | 2003-3-28 | 2003-10-24 |
| Kazakhstan | 2003-3-30 | 2003-10-26 |
| Kyrgyzstan | 2003-3-30 | 2003-10-26 |
| Lebanon | 2003-3-30 | 2003-10-25 |
| Mongolia | 2003-3-29 | 2003-9-27 |
| Nagorno-Karabakh | 2003-3-30 | 2003-10-26 |
| Northern Cyprus | 2003-3-30 | 2003-10-26 |
| Philippines | 2003-3-30 | 2003-10-26 |
| State of Palestine | 2003-4-18 | 2003-10-16 |
| Syria | 2003-4-1 | 2003-9-30 |
| Turkey | 2003-3-30 | 2003-10-26 |
Europe
| Country | Start of DST | End of DST |
| Albania | 2003-3-30 | 2003-10-26 |
| Andorra | 2003-3-30 | 2003-10-26 |
| Austria | 2003-3-30 | 2003-10-26 |
| Belarus | 2003-3-30 | 2003-10-26 |
| Belgium | 2003-3-30 | 2003-10-26 |
| Bosnia and Herzegovina | 2003-3-30 | 2003-10-26 |
| Bulgaria | 2003-3-30 | 2003-10-26 |
| Croatia | 2003-3-30 | 2003-10-26 |
| Czech Republic | 2003-3-30 | 2003-10-26 |
| Denmark | 2003-3-30 | 2003-10-26 |
| Estonia | 2003-3-30 | 2003-10-26 |
| Faroe Islands | 2003-3-30 | 2003-10-26 |
| Finland | 2003-3-30 | 2003-10-26 |
| France | 2003-3-30 | 2003-10-26 |
| Germany | 2003-3-30 | 2003-10-26 |
| Gibraltar | 2003-3-30 | 2003-10-26 |
| Greece | 2003-3-30 | 2003-10-26 |
| Guernsey | 2003-3-30 | 2003-10-26 |
| Hungary | 2003-3-30 | 2003-10-26 |
| Isle of Man | 2003-3-30 | 2003-10-26 |
| Italy | 2003-3-30 | 2003-10-26 |
| Jersey | 2003-3-30 | 2003-10-26 |
| Kosovo | 2003-3-30 | 2003-10-26 |
| Latvia | 2003-3-30 | 2003-10-26 |
| Liechtenstein | 2003-3-30 | 2003-10-26 |
| Lithuania | 2003-3-30 | 2003-10-26 |
| Luxembourg | 2003-3-30 | 2003-10-26 |
| Malta | 2003-3-30 | 2003-10-26 |
| Moldova | 2003-3-30 | 2003-10-26 |
| Montenegro | 2003-3-30 | 2003-10-26 |
| Netherlands | 2003-3-30 | 2003-10-26 |
| Norway | 2003-3-30 | 2003-10-26 |
| Poland | 2003-3-30 | 2003-10-26 |
| Portugal | 2003-3-30 | 2003-10-26 |
| Republic of Ireland | 2003-3-30 | 2003-10-26 |
| Republic of Macedonia | 2003-3-30 | 2003-10-26 |
| Romania | 2003-3-30 | 2003-10-26 |
| Russia | 2003-3-30 | 2003-10-26 |
| San Marino | 2003-3-30 | 2003-10-26 |
| Serbia | 2003-3-30 | 2003-10-26 |
| Slovakia | 2003-3-30 | 2003-10-26 |
| Slovenia | 2003-3-30 | 2003-10-26 |
| Spain | 2003-3-30 | 2003-10-26 |
| Svalbard | 2003-3-30 | 2003-10-26 |
| Sweden | 2003-3-30 | 2003-10-26 |
| Switzerland | 2003-3-30 | 2003-10-26 |
| Transnistria | 2003-3-30 | 2003-10-26 |
| Ukraine | 2003-3-30 | 2003-10-26 |
| United Kingdom | 2003-3-30 | 2003-10-26 |