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Reference.org
UTC offset
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<p>The UTC offset is the difference in hours and minutes between <a href="/facts/Coordinated_Universal_Time/2EnjfSyu">Coordinated Universal Time</a> (UTC) and the <a href="/facts/Standard_time/3dKMYnjM">standard time</a> at a particular place. This difference is expressed with respect to UTC and is generally shown in the format ±[hh]:[mm], ±[hh][mm], or ±[hh]. So if the time being described is two hours ahead of UTC (such as in <a href="/facts/Kigali/nrmQaxMX">Kigali</a>, <a href="/facts/Rwanda/UKR5UdKy">Rwanda</a> [approximately 30° E]), the UTC offset would be "+02:00", "+0200", or simply "+02". </p><p>By convention, every inhabited place in the world has a UTC offset that is a multiple of 15 minutes but the majority of offsets are stated in whole hours. There are many cases where the national <a href="/facts/Standard_time/3dKMYnjM">standard time</a> uses a UTC offset that is not defined solely by longitude. </p>