Unit Timezone
From Ultibo.org
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Description
Ultibo Timezone Interface unit
Constants
Timezone specific constants
TIME_ZONE_* TIME_ZONE_ID_UNKNOWN = 0;
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TIME_ZONE_ID_STANDARD = 1;
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TIME_ZONE_ID_DAYLIGHT = 2;
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TIME_ZONE_ID_INVALID = DWORD($FFFFFFFF);
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Timezone signature
TIMEZONE_SIGNATURE_* TIMEZONE_SIGNATURE = $ED9A1BC3;
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Type definitions
System time
LPSYSTEMTIME = SysUtils.LPSYSTEMTIME;
SYSTEMTIME = SysUtils.SYSTEMTIME;
TSystemTime = SysUtils.TSystemTime;
PSystemTime = SysUtils.PSystemTime;
_SYSTEMTIME = SysUtils.SYSTEMTIME;
wYear:Word;
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wMonth:Word;
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wDayOfWeek:Word;
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wDay:Word;
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wHour:Word;
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wMinute:Word;
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wSecond:Word;
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wMilliseconds:Word;
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Timezone information
TIME_ZONE_INFORMATION = _TIME_ZONE_INFORMATION;
LPTIME_ZONE_INFORMATION = ^TIME_ZONE_INFORMATION;
TTimeZoneInformation = TIME_ZONE_INFORMATION;
PTimeZoneInformation = PTIME_ZONE_INFORMATION;
PTIME_ZONE_INFORMATION = ^TIME_ZONE_INFORMATION;
_TIME_ZONE_INFORMATION = record
Bias:LONG;
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StandardName:array [0..31] of WCHAR;
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StandardDate:SYSTEMTIME;
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StandardBias:LONG;
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DaylightName:array [0..31] of WCHAR;
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DaylightDate:SYSTEMTIME;
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DaylightBias:LONG;
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Timezone data
PTimezoneData = ^TTimezoneData;
TTimezoneData = record
Name:String[32];
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Description:String[64];
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Bias:LongInt;
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StandardName:String[32];
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StandardBias:LongInt;
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StandardStart:SYSTEMTIME;
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DaylightName:String[32];
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DaylightBias:LongInt;
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DaylightStart:SYSTEMTIME;
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Timezone enumeration callback
TTimezoneEnumerate = function(Timezone:PTimezoneEntry; Data:Pointer):LongWord;
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Timezone entry
PTimezoneEntry = ^TTimezoneEntry;
TTimezoneEntry = record
| Timezone Properties | |
Signature:LongWord;
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Signature for entry validation |
Name:array[0..TIMEZONE_NAME_LENGTH - 1] of Char;
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Timezone name |
Description:array[0..TIMEZONE_DESC_LENGTH - 1] of Char;
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Timezone description |
Bias:LongInt;
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StandardName:array[0..TIMEZONE_NAME_LENGTH - 1] of Char;
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Standard name |
StandardBias:LongInt;
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StandardStart:SYSTEMTIME;
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DaylightName:array[0..TIMEZONE_NAME_LENGTH - 1] of Char;
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Daylight name |
DaylightBias:LongInt;
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DaylightStart:SYSTEMTIME;
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| Internal Properties | |
Prev:PTimezoneEntry;
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Previous entry in Timezone table |
Next:PTimezoneEntry;
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Next entry in Timezone table |
Public variables
None defined
Function declarations
Initialization functions
procedure TimezoneInit;
Description: To be documented
| Note | None documented |
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Timezone functions
function TimezoneAdd(Data:PTimezoneData; Default:Boolean):LongWord;
Description: Add a Timezone from a timezone data block and to the Timezone table
| Note | None documented |
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function TimezoneDelete(Timezone:PTimezoneEntry):LongWord;
Description: To be documented
| Note | None documented |
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function TimezoneGetName(Timezone:PTimezoneEntry):String;
Description: To be documented
| Note | None documented |
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function TimezoneGetDescription(Timezone:PTimezoneEntry):String;
Description: To be documented
| Note | None documented |
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function TimezoneGetBias(Timezone:PTimezoneEntry):LongInt;
Description: To be documented
| Note | None documented |
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function TimezoneGetState(Timezone:PTimezoneEntry):LongWord; inline;
Description: Get the state of the supplied Timezone at the current date and time
| Timezone | The timezone entry to get the state for |
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| Return | The TIME_ZONE_ID_* constant representing the standard / daylight state of the timezone |
function TimezoneGetStateEx(Timezone:PTimezoneEntry; const DateTime:TDateTime):LongWord;
Description: Get the state of the supplied Timezone at the specified date and time
| Timezone | The timezone entry to get the state for |
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| DateTime | The date and time to get the state of the timezone at |
| Return | The TIME_ZONE_ID_* constant representing the standard / daylight state of the timezone |
function TimezoneGetActiveBias(Timezone:PTimezoneEntry):LongInt; inline;
Description: Get the bias (offset between UTC and Local) of the supplied Timezone at the current date and time
| Timezone | The timezone entry to get the bias for |
|---|---|
| Return | The bias in minutes offset between UTC and Local including any daylight bias if active |
function TimezoneGetActiveBiasEx(Timezone:PTimezoneEntry; const DateTime:TDateTime):LongInt;
Description: Get the bias (offset between UTC and Local) of the supplied Timezone at the specified date and time
| Timezone | The timezone entry to get the bias for |
|---|---|
| DateTime | The date and time to get the bias of the timezone at |
| Return | The bias in minutes offset between UTC and Local |
function TimezoneGetStandardName(Timezone:PTimezoneEntry):String;
Description: To be documented
| Note | None documented |
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function TimezoneGetStandardBias(Timezone:PTimezoneEntry):LongInt;
Description: To be documented
| Note | None documented |
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function TimezoneGetStandardDate(Timezone:PTimezoneEntry; Next:Boolean):TDateTime;
Description: To be documented
| Note | None documented |
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function TimezoneGetStandardStart(Timezone:PTimezoneEntry):SYSTEMTIME;
Description: To be documented
| Note | None documented |
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function TimezoneGetDaylightName(Timezone:PTimezoneEntry):String;
Description: To be documented
| Note | None documented |
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function TimezoneGetDaylightBias(Timezone:PTimezoneEntry):LongInt;
Description: To be documented
| Note | None documented |
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function TimezoneGetDaylightDate(Timezone:PTimezoneEntry; Next:Boolean):TDateTime;
Description: To be documented
| Note | None documented |
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function TimezoneGetDaylightStart(Timezone:PTimezoneEntry):SYSTEMTIME;
Description: To be documented
| Note | None documented |
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function TimezoneFind(const Name:String):PTimezoneEntry;
Description: To be documented
| Note | None documented |
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function TimezoneFindByStandard(const StandardName:String):PTimezoneEntry;
Description: To be documented
| Note | None documented |
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function TimezoneFindByDaylight(const DaylightName:String):PTimezoneEntry;
Description: To be documented
| Note | None documented |
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function TimezoneEnumerate(Callback:TTimezoneEnumerate; Data:Pointer):LongWord;
Description: To be documented
| Note | None documented |
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Timezone helper functions
function TimezoneGetCount:LongWord;
Description: Get the current timezone count
| Note | None documented |
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function TimezoneGetDefault:PTimezoneEntry;
Description: Get the current default timezone
| Note | None documented |
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function TimezoneSetDefault(Timezone:PTimezoneEntry):LongWord;
Description: Set the current default timezone
| Note | None documented |
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function TimezoneCheck(Timezone:PTimezoneEntry):PTimezoneEntry;
Description: Check if the supplied Timezone is in the Timezone table
| Note | None documented |
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function TimezoneUpdateOffset:LongWord;
Description: To be documented
| Note | None documented |
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function TimezoneUpdateEnvironment:LongWord;
Description: Update the TZ environment variable to represent the current timezone
function TimezoneStartToDateTime(const AStart:SYSTEMTIME; AYear:Word):TDateTime;
Description: Calculate the start date and time from the start date of a timezone
| Note | None documented |
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function TimezoneStartToDescription(const AStart:SYSTEMTIME):String;
Description: Get the description of the start date of a timezone
| Note | None documented |
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function TimezoneNameReplaceChar(const AName:String; AChar,AReplace:Char):String;
Description: Same as ReplaceChar in UltiboUtils, reproduced here to avoid including extra units
| Note | None documented |
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function TimezoneNameToAbbreviation(const AName:String):String;
Description: Get the abbreviation of a timezone name (eg Central Standard Time = CST)
| Note | None documented |
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