A time offset is defined by international convention as a number of hours and minutes from Coordinated Universal Time in Greenwich, England. Many time zones employ two time offsets, one for standard time and one for summer (see Daylight saving). It has been suggested that leap second be merged into this article or section. ... This page is about Greenwich in England. ... A time zone is a region of the Earth that has adopted the same standard time, usually referred to as the local time. ... Daylight saving time (also called DST, or Summer Time) is the local time a region is designated for a portion of the year, usually an hour forward from its standard official time. ...