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timezone.d
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timezone.d
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// Written in the D programming language
/++
$(SCRIPT inhibitQuickIndex = 1;)
$(DIVC quickindex,
$(BOOKTABLE,
$(TR $(TH Category) $(TH Functions))
$(TR $(TD Time zones) $(TD
$(LREF TimeZone)
$(LREF UTC)
$(LREF LocalTime)
$(LREF PosixTimeZone)
$(LREF WindowsTimeZone)
$(LREF SimpleTimeZone)
))
$(TR $(TD Utilities) $(TD
$(LREF clearTZEnvVar)
$(LREF parseTZConversions)
$(LREF setTZEnvVar)
$(LREF TZConversions)
))
))
License: $(HTTP www.boost.org/LICENSE_1_0.txt, Boost License 1.0).
Authors: $(HTTP jmdavisprog.com, Jonathan M Davis)
Source: $(PHOBOSSRC std/datetime/timezone.d)
+/
module std.datetime.timezone;
import core.time : abs, convert, dur, Duration, hours, minutes;
import std.datetime.systime : Clock, stdTimeToUnixTime, SysTime;
import std.range.primitives : back, empty, front, isOutputRange, popFront;
import std.traits : isIntegral, isSomeString;
version (OSX)
version = Darwin;
else version (iOS)
version = Darwin;
else version (TVOS)
version = Darwin;
else version (WatchOS)
version = Darwin;
version (Windows)
{
import core.stdc.time : time_t;
import core.sys.windows.winbase;
import core.sys.windows.winsock2;
import std.windows.registry;
// Uncomment and run unittests to print missing Windows TZ translations.
// Please subscribe to Microsoft Daylight Saving Time & Time Zone Blog
// (https://blogs.technet.microsoft.com/dst2007/) if you feel responsible
// for updating the translations.
// version = UpdateWindowsTZTranslations;
}
else version (Posix)
{
import core.sys.posix.signal : timespec;
import core.sys.posix.sys.types : time_t;
}
version (StdUnittest) import std.exception : assertThrown;
/++
Represents a time zone. It is used with $(REF SysTime,std,datetime,systime)
to indicate the time zone of a $(REF SysTime,std,datetime,systime).
+/
abstract class TimeZone
{
public:
/++
The name of the time zone. Exactly how the time zone name is formatted
depends on the derived class. In the case of $(LREF PosixTimeZone), it's
the TZ Database name, whereas with $(LREF WindowsTimeZone), it's the
name that Windows chose to give the registry key for that time zone
(typically the name that they give $(LREF stdTime) if the OS is in
English). For other time zone types, what it is depends on how they're
implemented.
See_Also:
$(HTTP en.wikipedia.org/wiki/Tz_database, Wikipedia entry on TZ
Database)<br>
$(HTTP en.wikipedia.org/wiki/List_of_tz_database_time_zones, List of
Time Zones)
+/
@property string name() @safe const nothrow
{
return _name;
}
/++
Typically, the abbreviation (generally 3 or 4 letters) for the time zone
when DST is $(I not) in effect (e.g. PST). It is not necessarily unique.
However, on Windows, it may be the unabbreviated name (e.g. Pacific
Standard Time). Regardless, it is not the same as name.
+/
@property string stdName() @safe const nothrow
{
return _stdName;
}
/++
Typically, the abbreviation (generally 3 or 4 letters) for the time zone
when DST $(I is) in effect (e.g. PDT). It is not necessarily unique.
However, on Windows, it may be the unabbreviated name (e.g. Pacific
Daylight Time). Regardless, it is not the same as name.
+/
@property string dstName() @safe const nothrow
{
return _dstName;
}
/++
Whether this time zone has Daylight Savings Time at any point in time.
Note that for some time zone types it may not have DST for current dates
but will still return true for `hasDST` because the time zone did at
some point have DST.
+/
@property abstract bool hasDST() @safe const nothrow;
/++
Takes the number of hnsecs (100 ns) since midnight, January 1st, 1 A.D.
in UTC time (i.e. std time) and returns whether DST is effect in this
time zone at the given point in time.
Params:
stdTime = The UTC time that needs to be checked for DST in this time
zone.
+/
abstract bool dstInEffect(long stdTime) @safe const nothrow;
/++
Takes the number of hnsecs (100 ns) since midnight, January 1st, 1 A.D.
in UTC time (i.e. std time) and converts it to this time zone's time.
Params:
stdTime = The UTC time that needs to be adjusted to this time zone's
time.
+/
abstract long utcToTZ(long stdTime) @safe const nothrow;
/++
Takes the number of hnsecs (100 ns) since midnight, January 1st, 1 A.D.
in this time zone's time and converts it to UTC (i.e. std time).
Params:
adjTime = The time in this time zone that needs to be adjusted to
UTC time.
+/
abstract long tzToUTC(long adjTime) @safe const nothrow;
/++
Returns what the offset from UTC is at the given std time.
It includes the DST offset in effect at that time (if any).
Params:
stdTime = The UTC time for which to get the offset from UTC for this
time zone.
+/
Duration utcOffsetAt(long stdTime) @safe const nothrow
{
return dur!"hnsecs"(utcToTZ(stdTime) - stdTime);
}
// The purpose of this is to handle the case where a Windows time zone is
// new and exists on an up-to-date Windows box but does not exist on Windows
// boxes which have not been properly updated. The "date added" is included
// on the theory that we'll be able to remove them at some point in the
// the future once enough time has passed, and that way, we know how much
// time has passed.
private static string _getOldName(string windowsTZName) @safe pure nothrow
{
switch (windowsTZName)
{
case "Belarus Standard Time": return "Kaliningrad Standard Time"; // Added 2014-10-08
case "Russia Time Zone 10": return "Magadan Standard Time"; // Added 2014-10-08
case "Russia Time Zone 11": return "Magadan Standard Time"; // Added 2014-10-08
case "Russia Time Zone 3": return "Russian Standard Time"; // Added 2014-10-08
default: return null;
}
}
// Since reading in the time zone files could be expensive, most unit tests
// are consolidated into this one unittest block which minimizes how often
// it reads a time zone file.
@system unittest
{
import core.exception : AssertError;
import std.conv : to;
import std.file : exists, isFile;
import std.format : format;
import std.path : chainPath;
import std.stdio : writefln;
import std.typecons : tuple;
version (Posix) alias getTimeZone = PosixTimeZone.getTimeZone;
else version (Windows) alias getTimeZone = WindowsTimeZone.getTimeZone;
version (Posix) scope(exit) clearTZEnvVar();
static immutable(TimeZone) testTZ(string tzName,
string stdName,
string dstName,
Duration utcOffset,
Duration dstOffset,
bool north = true)
{
scope(failure) writefln("Failed time zone: %s", tzName);
version (Posix)
{
immutable tz = PosixTimeZone.getTimeZone(tzName);
assert(tz.name == tzName);
}
else version (Windows)
{
immutable tz = WindowsTimeZone.getTimeZone(tzName);
assert(tz.name == stdName);
}
immutable hasDST = dstOffset != Duration.zero;
//assert(tz.stdName == stdName); //Locale-dependent
//assert(tz.dstName == dstName); //Locale-dependent
assert(tz.hasDST == hasDST);
import std.datetime.date : DateTime;
immutable stdDate = DateTime(2010, north ? 1 : 7, 1, 6, 0, 0);
immutable dstDate = DateTime(2010, north ? 7 : 1, 1, 6, 0, 0);
auto std = SysTime(stdDate, tz);
auto dst = SysTime(dstDate, tz);
auto stdUTC = SysTime(stdDate - utcOffset, UTC());
auto dstUTC = SysTime(stdDate - utcOffset + dstOffset, UTC());
assert(!std.dstInEffect);
assert(dst.dstInEffect == hasDST);
assert(tz.utcOffsetAt(std.stdTime) == utcOffset);
assert(tz.utcOffsetAt(dst.stdTime) == utcOffset + dstOffset);
assert(cast(DateTime) std == stdDate);
assert(cast(DateTime) dst == dstDate);
assert(std == stdUTC);
version (Posix)
{
setTZEnvVar(tzName);
static void testTM(scope const SysTime st)
{
import core.stdc.time : tm;
import core.sys.posix.time : localtime_r;
time_t unixTime = st.toUnixTime();
tm osTimeInfo = void;
localtime_r(&unixTime, &osTimeInfo);
tm ourTimeInfo = st.toTM();
assert(ourTimeInfo.tm_sec == osTimeInfo.tm_sec);
assert(ourTimeInfo.tm_min == osTimeInfo.tm_min);
assert(ourTimeInfo.tm_hour == osTimeInfo.tm_hour);
assert(ourTimeInfo.tm_mday == osTimeInfo.tm_mday);
assert(ourTimeInfo.tm_mon == osTimeInfo.tm_mon);
assert(ourTimeInfo.tm_year == osTimeInfo.tm_year);
assert(ourTimeInfo.tm_wday == osTimeInfo.tm_wday);
assert(ourTimeInfo.tm_yday == osTimeInfo.tm_yday);
assert(ourTimeInfo.tm_isdst == osTimeInfo.tm_isdst);
assert(ourTimeInfo.tm_gmtoff == osTimeInfo.tm_gmtoff);
assert(to!string(ourTimeInfo.tm_zone) == to!string(osTimeInfo.tm_zone));
}
testTM(std);
testTM(dst);
// Apparently, right/ does not exist on Mac OS X. I don't know
// whether or not it exists on FreeBSD. It's rather pointless
// normally, since the Posix standard requires that leap seconds
// be ignored, so it does make some sense that right/ wouldn't
// be there, but since PosixTimeZone _does_ use leap seconds if
// the time zone file does, we'll test that functionality if the
// appropriate files exist.
if (chainPath(PosixTimeZone.defaultTZDatabaseDir, "right", tzName).exists)
{
auto leapTZ = PosixTimeZone.getTimeZone("right/" ~ tzName);
assert(leapTZ.name == "right/" ~ tzName);
//assert(leapTZ.stdName == stdName); //Locale-dependent
//assert(leapTZ.dstName == dstName); //Locale-dependent
assert(leapTZ.hasDST == hasDST);
auto leapSTD = SysTime(std.stdTime, leapTZ);
auto leapDST = SysTime(dst.stdTime, leapTZ);
assert(!leapSTD.dstInEffect);
assert(leapDST.dstInEffect == hasDST);
assert(leapSTD.stdTime == std.stdTime);
assert(leapDST.stdTime == dst.stdTime);
// Whenever a leap second is added/removed,
// this will have to be adjusted.
//enum leapDiff = convert!("seconds", "hnsecs")(25);
//assert(leapSTD.adjTime - leapDiff == std.adjTime);
//assert(leapDST.adjTime - leapDiff == dst.adjTime);
}
}
return tz;
}
import std.datetime.date : DateTime;
auto dstSwitches = [/+America/Los_Angeles+/ tuple(DateTime(2012, 3, 11), DateTime(2012, 11, 4), 2, 2),
/+America/New_York+/ tuple(DateTime(2012, 3, 11), DateTime(2012, 11, 4), 2, 2),
///+America/Santiago+/ tuple(DateTime(2011, 8, 21), DateTime(2011, 5, 8), 0, 0),
/+Europe/London+/ tuple(DateTime(2012, 3, 25), DateTime(2012, 10, 28), 1, 2),
/+Europe/Paris+/ tuple(DateTime(2012, 3, 25), DateTime(2012, 10, 28), 2, 3),
/+Australia/Adelaide+/ tuple(DateTime(2012, 10, 7), DateTime(2012, 4, 1), 2, 3)];
import std.datetime.date : DateTimeException;
version (Posix)
{
version (FreeBSD) enum utcZone = "Etc/UTC";
else version (NetBSD) enum utcZone = "UTC";
else version (DragonFlyBSD) enum utcZone = "UTC";
else version (linux) enum utcZone = "UTC";
else version (Darwin) enum utcZone = "UTC";
else version (Solaris) enum utcZone = "UTC";
else static assert(0, "The location of the UTC timezone file on this Posix platform must be set.");
auto tzs = [testTZ("America/Los_Angeles", "PST", "PDT", dur!"hours"(-8), dur!"hours"(1)),
testTZ("America/New_York", "EST", "EDT", dur!"hours"(-5), dur!"hours"(1)),
//testTZ("America/Santiago", "CLT", "CLST", dur!"hours"(-4), dur!"hours"(1), false),
testTZ("Europe/London", "GMT", "BST", dur!"hours"(0), dur!"hours"(1)),
testTZ("Europe/Paris", "CET", "CEST", dur!"hours"(1), dur!"hours"(1)),
// Per www.timeanddate.com, it should be "CST" and "CDT",
// but the OS insists that it's "CST" for both. We should
// probably figure out how to report an error in the TZ
// database and report it.
testTZ("Australia/Adelaide", "CST", "CST",
dur!"hours"(9) + dur!"minutes"(30), dur!"hours"(1), false)];
testTZ(utcZone, "UTC", "UTC", dur!"hours"(0), dur!"hours"(0));
assertThrown!DateTimeException(PosixTimeZone.getTimeZone("hello_world"));
}
else version (Windows)
{
auto tzs = [testTZ("Pacific Standard Time", "Pacific Standard Time",
"Pacific Daylight Time", dur!"hours"(-8), dur!"hours"(1)),
testTZ("Eastern Standard Time", "Eastern Standard Time",
"Eastern Daylight Time", dur!"hours"(-5), dur!"hours"(1)),
//testTZ("Pacific SA Standard Time", "Pacific SA Standard Time",
//"Pacific SA Daylight Time", dur!"hours"(-4), dur!"hours"(1), false),
testTZ("GMT Standard Time", "GMT Standard Time",
"GMT Daylight Time", dur!"hours"(0), dur!"hours"(1)),
testTZ("Romance Standard Time", "Romance Standard Time",
"Romance Daylight Time", dur!"hours"(1), dur!"hours"(1)),
testTZ("Cen. Australia Standard Time", "Cen. Australia Standard Time",
"Cen. Australia Daylight Time",
dur!"hours"(9) + dur!"minutes"(30), dur!"hours"(1), false)];
testTZ("Greenwich Standard Time", "Greenwich Standard Time",
"Greenwich Daylight Time", dur!"hours"(0), dur!"hours"(0));
assertThrown!DateTimeException(WindowsTimeZone.getTimeZone("hello_world"));
}
else
assert(0, "OS not supported.");
foreach (i; 0 .. tzs.length)
{
auto tz = tzs[i];
immutable spring = dstSwitches[i][2];
immutable fall = dstSwitches[i][3];
auto stdOffset = SysTime(dstSwitches[i][0] + dur!"days"(-1), tz).utcOffset;
auto dstOffset = stdOffset + dur!"hours"(1);
// Verify that creating a SysTime in the given time zone results
// in a SysTime with the correct std time during and surrounding
// a DST switch.
foreach (hour; -12 .. 13)
{
import std.exception : enforce;
auto st = SysTime(dstSwitches[i][0] + dur!"hours"(hour), tz);
immutable targetHour = hour < 0 ? hour + 24 : hour;
static void testHour(SysTime st, int hour, string tzName, size_t line = __LINE__)
{
enforce(st.hour == hour,
new AssertError(format("[%s] [%s]: [%s] [%s]", st, tzName, st.hour, hour),
__FILE__, line));
}
void testOffset1(Duration offset, bool dstInEffect, size_t line = __LINE__)
{
AssertError msg(string tag)
{
return new AssertError(format("%s [%s] [%s]: [%s] [%s] [%s]",
tag, st, tz.name, st.utcOffset, stdOffset, dstOffset),
__FILE__, line);
}
enforce(st.dstInEffect == dstInEffect, msg("1"));
enforce(st.utcOffset == offset, msg("2"));
enforce((st + dur!"minutes"(1)).utcOffset == offset, msg("3"));
}
if (hour == spring)
{
testHour(st, spring + 1, tz.name);
testHour(st + dur!"minutes"(1), spring + 1, tz.name);
}
else
{
testHour(st, targetHour, tz.name);
testHour(st + dur!"minutes"(1), targetHour, tz.name);
}
if (hour < spring)
testOffset1(stdOffset, false);
else
testOffset1(dstOffset, true);
st = SysTime(dstSwitches[i][1] + dur!"hours"(hour), tz);
testHour(st, targetHour, tz.name);
// Verify that 01:00 is the first 01:00 (or whatever hour before the switch is).
if (hour == fall - 1)
testHour(st + dur!"hours"(1), targetHour, tz.name);
if (hour < fall)
testOffset1(dstOffset, true);
else
testOffset1(stdOffset, false);
}
// Verify that converting a time in UTC to a time in another
// time zone results in the correct time during and surrounding
// a DST switch.
bool first = true;
auto springSwitch = SysTime(dstSwitches[i][0] + dur!"hours"(spring), UTC()) - stdOffset;
auto fallSwitch = SysTime(dstSwitches[i][1] + dur!"hours"(fall), UTC()) - dstOffset;
// https://issues.dlang.org/show_bug.cgi?id=3659 makes this necessary.
auto fallSwitchMinus1 = fallSwitch - dur!"hours"(1);
foreach (hour; -24 .. 25)
{
auto utc = SysTime(dstSwitches[i][0] + dur!"hours"(hour), UTC());
auto local = utc.toOtherTZ(tz);
void testOffset2(Duration offset, size_t line = __LINE__)
{
AssertError msg(string tag)
{
return new AssertError(format("%s [%s] [%s]: [%s] [%s]", tag, hour, tz.name, utc, local),
__FILE__, line);
}
import std.exception : enforce;
enforce((utc + offset).hour == local.hour, msg("1"));
enforce((utc + offset + dur!"minutes"(1)).hour == local.hour, msg("2"));
}
if (utc < springSwitch)
testOffset2(stdOffset);
else
testOffset2(dstOffset);
utc = SysTime(dstSwitches[i][1] + dur!"hours"(hour), UTC());
local = utc.toOtherTZ(tz);
if (utc == fallSwitch || utc == fallSwitchMinus1)
{
if (first)
{
testOffset2(dstOffset);
first = false;
}
else
testOffset2(stdOffset);
}
else if (utc > fallSwitch)
testOffset2(stdOffset);
else
testOffset2(dstOffset);
}
}
}
protected:
/++
Params:
name = The name of the time zone.
stdName = The abbreviation for the time zone during std time.
dstName = The abbreviation for the time zone during DST.
+/
this(string name, string stdName, string dstName) @safe immutable pure
{
_name = name;
_stdName = stdName;
_dstName = dstName;
}
private:
immutable string _name;
immutable string _stdName;
immutable string _dstName;
}
/++
A TimeZone which represents the current local time zone on
the system running your program.
This uses the underlying C calls to adjust the time rather than using
specific D code based off of system settings to calculate the time such as
$(LREF PosixTimeZone) and $(LREF WindowsTimeZone) do. That also means that
it will use whatever the current time zone is on the system, even if the
system's time zone changes while the program is running.
+/
final class LocalTime : TimeZone
{
public:
/++
$(LREF LocalTime) is a singleton class. $(LREF LocalTime) returns its
only instance.
+/
static immutable(LocalTime) opCall() @trusted pure nothrow
{
alias FuncType = immutable(LocalTime) function() @safe pure nothrow;
return (cast(FuncType)&singleton)();
}
version (StdDdoc)
{
/++
In principle, this is the name of the local time zone. However,
this always returns the empty string. This is because time zones
cannot be uniquely identified by the attributes given by the
OS (such as the `stdName` and `dstName`), and neither Posix systems
nor Windows systems provide an easy way to get the TZ Database name
of the local time zone.
See_Also:
$(HTTP en.wikipedia.org/wiki/Tz_database, Wikipedia entry on TZ
Database)<br>
$(HTTP en.wikipedia.org/wiki/List_of_tz_database_time_zones, List
of Time Zones)
+/
@property override string name() @safe const nothrow;
}
/++
Typically, the abbreviation (generally 3 or 4 letters) for the time zone
when DST is $(I not) in effect (e.g. PST). It is not necessarily unique.
However, on Windows, it may be the unabbreviated name (e.g. Pacific
Standard Time). Regardless, it is not the same as name.
This property is overridden because the local time of the system could
change while the program is running and we need to determine it
dynamically rather than it being fixed like it would be with most time
zones.
+/
@property override string stdName() @trusted const nothrow
{
version (Posix)
{
import core.stdc.time : tzname;
import std.conv : to;
try
return to!string(tzname[0]);
catch (Exception e)
assert(0, "to!string(tzname[0]) failed.");
}
else version (Windows)
{
TIME_ZONE_INFORMATION tzInfo;
GetTimeZoneInformation(&tzInfo);
// Cannot use to!string() like this should, probably due to bug
// https://issues.dlang.org/show_bug.cgi?id=5016
//return to!string(tzInfo.StandardName);
wchar[32] str;
foreach (i, ref wchar c; str)
c = tzInfo.StandardName[i];
string retval;
try
{
foreach (dchar c; str)
{
if (c == '\0')
break;
retval ~= c;
}
return retval;
}
catch (Exception e)
assert(0, "GetTimeZoneInformation() returned invalid UTF-16.");
}
}
@safe unittest
{
version (FreeBSD)
{
// A bug on FreeBSD 9+ makes it so that this test fails.
// https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=168862
}
else version (NetBSD)
{
// The same bug on NetBSD 7+
}
else
{
assert(LocalTime().stdName !is null);
version (Posix)
{
scope(exit) clearTZEnvVar();
setTZEnvVar("America/Los_Angeles");
assert(LocalTime().stdName == "PST");
setTZEnvVar("America/New_York");
assert(LocalTime().stdName == "EST");
}
}
}
/++
Typically, the abbreviation (generally 3 or 4 letters) for the time zone
when DST $(I is) in effect (e.g. PDT). It is not necessarily unique.
However, on Windows, it may be the unabbreviated name (e.g. Pacific
Daylight Time). Regardless, it is not the same as name.
This property is overridden because the local time of the system could
change while the program is running and we need to determine it
dynamically rather than it being fixed like it would be with most time
zones.
+/
@property override string dstName() @trusted const nothrow
{
version (Posix)
{
import core.stdc.time : tzname;
import std.conv : to;
try
return to!string(tzname[1]);
catch (Exception e)
assert(0, "to!string(tzname[1]) failed.");
}
else version (Windows)
{
TIME_ZONE_INFORMATION tzInfo;
GetTimeZoneInformation(&tzInfo);
// Cannot use to!string() like this should, probably due to bug
// https://issues.dlang.org/show_bug.cgi?id=5016
//return to!string(tzInfo.DaylightName);
wchar[32] str;
foreach (i, ref wchar c; str)
c = tzInfo.DaylightName[i];
string retval;
try
{
foreach (dchar c; str)
{
if (c == '\0')
break;
retval ~= c;
}
return retval;
}
catch (Exception e)
assert(0, "GetTimeZoneInformation() returned invalid UTF-16.");
}
}
@safe unittest
{
// tzname, called from dstName, isn't set by default for Musl.
version (CRuntime_Musl)
assert(LocalTime().dstName is null);
else
assert(LocalTime().dstName !is null);
version (Posix)
{
scope(exit) clearTZEnvVar();
version (FreeBSD)
{
// A bug on FreeBSD 9+ makes it so that this test fails.
// https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=168862
}
else version (NetBSD)
{
// The same bug on NetBSD 7+
}
else
{
setTZEnvVar("America/Los_Angeles");
assert(LocalTime().dstName == "PDT");
setTZEnvVar("America/New_York");
assert(LocalTime().dstName == "EDT");
}
}
}
/++
Whether this time zone has Daylight Savings Time at any point in time.
Note that for some time zone types it may not have DST for current
dates but will still return true for `hasDST` because the time zone
did at some point have DST.
+/
@property override bool hasDST() @trusted const nothrow
{
version (Posix)
{
static if (is(typeof(daylight)))
return cast(bool)(daylight);
else
{
try
{
import std.datetime.date : Date;
auto currYear = (cast(Date) Clock.currTime()).year;
auto janOffset = SysTime(Date(currYear, 1, 4), cast(immutable) this).stdTime -
SysTime(Date(currYear, 1, 4), UTC()).stdTime;
auto julyOffset = SysTime(Date(currYear, 7, 4), cast(immutable) this).stdTime -
SysTime(Date(currYear, 7, 4), UTC()).stdTime;
return janOffset != julyOffset;
}
catch (Exception e)
assert(0, "Clock.currTime() threw.");
}
}
else version (Windows)
{
TIME_ZONE_INFORMATION tzInfo;
GetTimeZoneInformation(&tzInfo);
return tzInfo.DaylightDate.wMonth != 0;
}
}
@safe unittest
{
LocalTime().hasDST;
version (Posix)
{
scope(exit) clearTZEnvVar();
setTZEnvVar("America/Los_Angeles");
assert(LocalTime().hasDST);
setTZEnvVar("America/New_York");
assert(LocalTime().hasDST);
setTZEnvVar("UTC");
assert(!LocalTime().hasDST);
}
}
/++
Takes the number of hnsecs (100 ns) since midnight, January 1st, 1 A.D.
in UTC time (i.e. std time) and returns whether DST is in effect in this
time zone at the given point in time.
Params:
stdTime = The UTC time that needs to be checked for DST in this time
zone.
+/
override bool dstInEffect(long stdTime) @trusted const nothrow
{
import core.stdc.time : tm;
time_t unixTime = stdTimeToUnixTime(stdTime);
version (Posix)
{
import core.sys.posix.time : localtime_r;
tm timeInfo = void;
localtime_r(&unixTime, &timeInfo);
return cast(bool)(timeInfo.tm_isdst);
}
else version (Windows)
{
import core.stdc.time : localtime;
// Apparently Windows isn't smart enough to deal with negative time_t.
if (unixTime >= 0)
{
tm* timeInfo = localtime(&unixTime);
if (timeInfo)
return cast(bool)(timeInfo.tm_isdst);
}
TIME_ZONE_INFORMATION tzInfo;
GetTimeZoneInformation(&tzInfo);
return WindowsTimeZone._dstInEffect(&tzInfo, stdTime);
}
}
@safe unittest
{
auto currTime = Clock.currStdTime;
LocalTime().dstInEffect(currTime);
}
/++
Returns hnsecs in the local time zone using the standard C function
calls on Posix systems and the standard Windows system calls on Windows
systems to adjust the time to the appropriate time zone from std time.
Params:
stdTime = The UTC time that needs to be adjusted to this time zone's
time.
See_Also:
`TimeZone.utcToTZ`
+/
override long utcToTZ(long stdTime) @trusted const nothrow
{
version (Solaris)
return stdTime + convert!("seconds", "hnsecs")(tm_gmtoff(stdTime));
else version (Posix)
{
import core.stdc.time : tm;
import core.sys.posix.time : localtime_r;
time_t unixTime = stdTimeToUnixTime(stdTime);
tm timeInfo = void;
localtime_r(&unixTime, &timeInfo);
return stdTime + convert!("seconds", "hnsecs")(timeInfo.tm_gmtoff);
}
else version (Windows)
{
TIME_ZONE_INFORMATION tzInfo;
GetTimeZoneInformation(&tzInfo);
return WindowsTimeZone._utcToTZ(&tzInfo, stdTime, hasDST);
}
}
@safe unittest
{
LocalTime().utcToTZ(0);
}
/++
Returns std time using the standard C function calls on Posix systems
and the standard Windows system calls on Windows systems to adjust the
time to UTC from the appropriate time zone.
See_Also:
`TimeZone.tzToUTC`
Params:
adjTime = The time in this time zone that needs to be adjusted to
UTC time.
+/
override long tzToUTC(long adjTime) @trusted const nothrow
{
version (Posix)
{
import core.stdc.time : tm;
import core.sys.posix.time : localtime_r;
time_t unixTime = stdTimeToUnixTime(adjTime);
immutable past = unixTime - cast(time_t) convert!("days", "seconds")(1);
tm timeInfo = void;
localtime_r(past < unixTime ? &past : &unixTime, &timeInfo);
immutable pastOffset = timeInfo.tm_gmtoff;
immutable future = unixTime + cast(time_t) convert!("days", "seconds")(1);
localtime_r(future > unixTime ? &future : &unixTime, &timeInfo);
immutable futureOffset = timeInfo.tm_gmtoff;
if (pastOffset == futureOffset)
return adjTime - convert!("seconds", "hnsecs")(pastOffset);
if (pastOffset < futureOffset)
unixTime -= cast(time_t) convert!("hours", "seconds")(1);
unixTime -= pastOffset;
localtime_r(&unixTime, &timeInfo);
return adjTime - convert!("seconds", "hnsecs")(timeInfo.tm_gmtoff);
}
else version (Windows)
{
TIME_ZONE_INFORMATION tzInfo;
GetTimeZoneInformation(&tzInfo);
return WindowsTimeZone._tzToUTC(&tzInfo, adjTime, hasDST);
}
}
@safe unittest
{
import core.exception : AssertError;
import std.format : format;
import std.typecons : tuple;
assert(LocalTime().tzToUTC(LocalTime().utcToTZ(0)) == 0);
assert(LocalTime().utcToTZ(LocalTime().tzToUTC(0)) == 0);
assert(LocalTime().tzToUTC(LocalTime().utcToTZ(0)) == 0);
assert(LocalTime().utcToTZ(LocalTime().tzToUTC(0)) == 0);
version (Posix)
{
scope(exit) clearTZEnvVar();
import std.datetime.date : DateTime;
auto tzInfos = [tuple("America/Los_Angeles", DateTime(2012, 3, 11), DateTime(2012, 11, 4), 2, 2),
tuple("America/New_York", DateTime(2012, 3, 11), DateTime(2012, 11, 4), 2, 2),
//tuple("America/Santiago", DateTime(2011, 8, 21), DateTime(2011, 5, 8), 0, 0),
tuple("Atlantic/Azores", DateTime(2011, 3, 27), DateTime(2011, 10, 30), 0, 1),
tuple("Europe/London", DateTime(2012, 3, 25), DateTime(2012, 10, 28), 1, 2),
tuple("Europe/Paris", DateTime(2012, 3, 25), DateTime(2012, 10, 28), 2, 3),
tuple("Australia/Adelaide", DateTime(2012, 10, 7), DateTime(2012, 4, 1), 2, 3)];
foreach (i; 0 .. tzInfos.length)
{
import std.exception : enforce;
auto tzName = tzInfos[i][0];
setTZEnvVar(tzName);
immutable spring = tzInfos[i][3];
immutable fall = tzInfos[i][4];
auto stdOffset = SysTime(tzInfos[i][1] + dur!"hours"(-12)).utcOffset;
auto dstOffset = stdOffset + dur!"hours"(1);
// Verify that creating a SysTime in the given time zone results
// in a SysTime with the correct std time during and surrounding
// a DST switch.
foreach (hour; -12 .. 13)
{
auto st = SysTime(tzInfos[i][1] + dur!"hours"(hour));
immutable targetHour = hour < 0 ? hour + 24 : hour;
static void testHour(SysTime st, int hour, string tzName, size_t line = __LINE__)
{
enforce(st.hour == hour,
new AssertError(format("[%s] [%s]: [%s] [%s]", st, tzName, st.hour, hour),
__FILE__, line));
}
void testOffset1(Duration offset, bool dstInEffect, size_t line = __LINE__)
{
AssertError msg(string tag)
{
return new AssertError(format("%s [%s] [%s]: [%s] [%s] [%s]",
tag, st, tzName, st.utcOffset, stdOffset, dstOffset),
__FILE__, line);
}