39 lines
772 B
C++
39 lines
772 B
C++
// SPDX-License-Identifier: BSD-2-Clause
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// Copyright CM4all GmbH
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// author: Max Kellermann <mk@cm4all.com>
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#include "Zone.hxx"
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#ifdef _WIN32
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#include <profileapi.h>
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#include <sysinfoapi.h>
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#include <timezoneapi.h>
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#else
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#include <time.h>
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#endif
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int
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GetTimeZoneOffset() noexcept
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{
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#ifdef _WIN32
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TIME_ZONE_INFORMATION TimeZoneInformation;
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DWORD tzi = GetTimeZoneInformation(&TimeZoneInformation);
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int offset = -TimeZoneInformation.Bias * 60;
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if (tzi == TIME_ZONE_ID_STANDARD)
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offset -= TimeZoneInformation.StandardBias * 60;
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if (tzi == TIME_ZONE_ID_DAYLIGHT)
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offset -= TimeZoneInformation.DaylightBias * 60;
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return offset;
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#else
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time_t t = 1234567890;
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struct tm tm;
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tm.tm_isdst = 0;
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struct tm *p = &tm;
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gmtime_r(&t, p);
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return t - mktime(p);
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#endif
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}
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