Subroutine to apply Daylight Bias to display time in local DST?

UK is currently 1 hour ahead of UTC due to Daylight Savings Time. When I check the Daylight Bias value from GetTimeZoneInformation it is currently开发者_如何学运维 -60. Does that mean that translating UTC to DST means DST = UTC + -1 * DaylightBias, ie negate and add?

I thought in this case for instance adding Daylight Bias to UTC is the correct operation, hence requiring DaylightBias to be 60 rather than -60.

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It's

UTC = DST + DaylightBias [for your specific timezone]

so yes, you would subtract the Bias from UTC to get local time.
Here's a quote from the MS glossary:

time zone bias: The positive, zero, or negative offset in minutes from Coordinated Universal Time (UTC). For example, Middle European Time (MET, GMT+01:00) has a time zone bias of "-60" because it is one hour ahead of UTC. Pacific Standard Time (PST, GMT-08:00) has a time zone bias of "+480" because it is eight hours behind UTC.