The World Clock – Time Zone Converter – results

At the specified time, local time in London was the same as Lisbon

LocationLocal timeTime zoneUTC offset
Lisbon (Portugal)Saturday, April 6, 2013 at 12:00:00 midnightWESTUTC+1 hour
London (United Kingdom - England)Saturday, April 6, 2013 at 12:00:00 midnightBSTUTC+1 hour
Corresponding UTC (GMT)Friday, April 5, 2013 at 23:00:00  

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Lisbon (Portugal)                 Saturday, April 6, 2013 at 12:00:00 midnight WEST UTC+1 hour 
London (United Kingdom - England) Saturday, April 6, 2013 at 12:00:00 midnight BST  UTC+1 hour 
Corresponding UTC (GMT)           Friday, April 5, 2013 at 23:00:00                            
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Glossary

Midnight
Midnight here means "The start of the day" rather than "end of day" (00:00 in 24-hour format)
UTC
Coordinated Universal Time - the international basis for other time zones.
Same time as for GMT (Greenwich Mean Time) and Zulu time.
Note that United Kingdom is not on GMT during summer.

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