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Home/ Questions/Q 1033041
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Editorial Team
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Editorial Team
Asked: May 16, 20262026-05-16T14:10:23+00:00 2026-05-16T14:10:23+00:00

Is there a easy way in Windows (using Delphi, not .NET) to convert UTC

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Is there a easy way in Windows (using Delphi, not .NET) to convert UTC times to a local time, with daylight saving adjustments.

Data goes back 12 years, so needs to take account of changes in DST start/end dates over that time.

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  1. Editorial Team
    Editorial Team
    2026-05-16T14:10:24+00:00Added an answer on May 16, 2026 at 2:10 pm

    Funny, a very similar question appeared yesterday on LinkedIn.

    This is the answer I gave there:

    Time Zones are somewhat fluid,
    especially when Daylight Saving Time
    starts/finishes.

    This database (
    http://en.wikipedia.org/wiki/Tz_database
    ) defines the time zones, and it
    changes sometimes, so you need an
    update mechanism as well.

    There is a .NET implementation that
    you could wrap, or use as a base:
    http://www.codeproject.com/KB/locale/zoneinfo_dotnet_api.aspx

    I’m not sure how up to date this
    Delphi implementation is:
    http://sourceforge.net/projects/delphitz/

    Let us know your final implementation.

    Edit:
    The project mentioned above seems empty, so I searched further and found the Delphi TimeZone Database project to be still active.

    –jeroen

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