Digital Clock UK timings

[font=Arial]Sir,[/font]
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[font=Arial] I am working as a Web Designer and presently i am working on one Project where i have to put a Digital Clock of UK. I designed the Digital clock with summer time (Present is Summer season) but when winter comes it should show the winter time .[/font]
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[font=Arial]I am not able to write the script. Can you help me?[/font]
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[font=Arial]I want the clock should show the winter and summer time according to the season changes.[/font]
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[font=Arial]Thanking you,[/font]
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[font=Arial]Yours sincerely,[/font]
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[font=Arial]Chitra Ramgire[/font]