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Qore::TimeZone Class Reference

The TimeZone class provides access to time zone functionality. More...

`#include <QC_TimeZone.dox.h>`

Inheritance diagram for Qore::TimeZone:
[legend]

## Public Member Functions

int | UTCOffset ()
| Returns the number of seconds east of UTC for the zone; negative numbers indicate a zone west of UTC.
| constructor (string region)
| Creates the TimeZone object based on the region name (ex: `"America/Chicago"`)
| constructor (softint seconds_east)
| Creates the TimeZone object based on the number of seconds east of UTC (3600 = UTC +01)
| copy ()
| Creates a copy of the TimeZone object.
date | date (softint secs, softint us=0)
| Returns the equivalent date in the time zone of the current object.
date | date (date d)
| Returns the equivalent date in the time zone of the current object.
date | date (string dtstr)
| Returns the equivalent date in the time zone of the current object.
date | date (string dtstr, string mask)
| Returns a date/time value in the current TimeZone corresponding to parsing a string argument according to a format mask.
date | dateMs (softint ms)
| Returns a date in the object's zone based on an offsets in milliseconds from `1970-01-01Z`.
date | dateUs (softint us)
| Returns a date in the object's zone based on an offsets in microseconds from `1970-01-01Z`.
bool | hasDST ()
| Returns True if the zone has daylight saving time rules, False if not.
string | region ()
| Returns the region name as a string; if the current zone is based on a UTC offset, then the UTC offset is returned as a string like `"+01:00"`.
Public Member Functions inherited from Qore::Serializable
| constructor ()
| The constructor does not perform any action; this class is just used to mark a class as serializable by inheriting this class.
| copy ()
| The copy constructor does not perform any action; this class is just used to mark a class as serializable by inheriting this class.
| serialize (OutputStream stream, *int flags)
| converts the object to binary data representing the object
binary | serialize (*int flags)
| converts the object to binary data representing the object
hash< SerializationInfo > | serializeToData (*int flags)
| converts the object to a serialization hash representing the object

## Static Public Member Functions

static TimeZone | get ()
| Returns a TimeZone object for the current time zone.
static nothing | set (TimeZone zone)
| Sets the time zone for the current Program object from a TimeZone object.
static nothing | setRegion (string region)
| Sets the time zone for the current Program object from a time zone region name.
static nothing | setUTCOffset (softint seconds_east)
| Sets the time zone for the current Program object from an integer offset in seconds east of UTC.
Static Public Member Functions inherited from Qore::Serializable
static auto | deserialize (InputStream stream, *int flags)
| Deserializes data produced with serialize() and returns the value represented by the data.
static auto | deserialize (binary bin, *int flags)
| Deserializes data produced with serialize() and returns the value represented by the data.
static auto | deserialize (string bin, *int flags)
| Deserializes data produced with serialize() and returns the value represented by the data.
static auto | deserialize (hash< SerializationInfo > data, *int flags)
| Deserializes data produced with serializeToData() and returns the value represented by the data.
static hash< SerializationInfo > | deserializeToData (InputStream stream, *int flags)
| Deserializes data produced with serialize() and returns the value represented by the data.
static hash< SerializationInfo > | deserializeToData (binary bin, *int flags)
| Deserializes data produced with serialize() and returns the value represented by the data.
static | serialize (auto val, OutputStream stream, *int flags)
| serializes the data and writes the serialized data to the given output stream
static binary | serialize (auto val, *int flags)
| serializes the data and returns the serialized data as a binary object
static hash< SerializationInfo > | serializeToData (auto val, *int flags)
| converts the value to a serialization hash representing the value

## Detailed Description

The TimeZone class provides access to time zone functionality.

TimeZone objects based on zoneinfo region files (on UNIX) or registry information (on Windows) can have daylight savings time information; those based on UTC offsets have none.

The TimeZone class supports data serialization; deserialization can fail if the object is based on a region that is not present on the target machine.

## Member Function Documentation

## constructor() [1/2]

Qore::TimeZone::constructor | ( | softint | seconds_east | ) |

Creates the TimeZone object based on the number of seconds east of UTC (3600 = UTC +01)

Parameters

  seconds_east | The number of seconds east of UTC for the time zone; for zones west of UTC, use negative numbers

Example:
  TimeZone tz(3600);

## constructor() [2/2]

Qore::TimeZone::constructor | ( | string | region | ) |

Creates the TimeZone object based on the region name (ex: `"America/Chicago"`)

Parameters

  region | The region name for the time zone (ex: `"America/Chicago"`); if the zoneinfo file for the region cannot be found or parsed (on UNIX) or if the registry entry cannot be found (on Windows), then an exception is thrown

Note
  On Windows zoneinfo region names (ex: `"Europe/Prague"`) are converted to registry entries under `HKEY_LOCAL_MACHINE SOFTWARE\Microsoft\Windows NT\CurrentVersion\Time Zones` (ex: `"Central Europe Standard Time"`); on Windows you can also pass a registry key directly (ex: `"Central Europe Standard Time"`) as the region, in this case it will be used to find the timezone info in registry, however the region name will then be converted to the first corresponding zoneinfo region according to alphabet (ex: `"Central Europe Standard Time"` -> `"Europe/Belgrade"`); if an absolute path to a file is given as the argument, then a zoneinfo file is read and parsed from the given location

Example:
  TimeZone tz("Europe/Prague");

Exceptions

  TZINFO-ERROR | Unable to read zoneinfo file; invalid file magic; error parsing zoneinfo file, etc
  ILLEGAL-FILESYSTEM-ACCESS | thrown if a path was passed for region and the Qore::PO_NO_FILESYSTEM sandboxing restriction is set

Since
  Qore 0.8.12 an absolute path to a zoneinfo file can be provided if the Qore::PO_NO_FILESYSTEM sandboxing restriction is not in place (checked at runtime if an absolute path is passed)

## copy()

Qore::TimeZone::copy | ( |  | ) |

Creates a copy of the TimeZone object.

Example:
  TimeZone newzone = tz.copy();

## date() [1/4]

date Qore::TimeZone::date | ( | date | d | ) |

Returns the equivalent date in the time zone of the current object.

Code Flags:
  CONSTANT

Parameters

  d | A date that will be used to create the date in the time zone of the objects; the same point in time will be returned but in the time zone of the object

Example:
  date dt = tz.date(2012-01-01T13:56:23+01:00);

## date() [2/4]

date Qore::TimeZone::date | ( | softint | secs,
|  | softint | us = 0 )

Returns the equivalent date in the time zone of the current object.

Code Flags:
  CONSTANT

Parameters

  secs | offset are in seconds from 1970-01-01Z
  us | offset are in microseconds from `1970-01-01Z`

Example:
  date dt = tz.date(secs);

## date() [3/4]

date Qore::TimeZone::date | ( | string | dtstr | ) |

Returns the equivalent date in the time zone of the current object.

Code Flags:
  CONSTANT

Parameters

  dtstr | The string to be used to return a date in the object's time zone

Example:
  date dt = tz.date("2012-01-01T13:56:23");

Since
  Qore 0.8.4

## date() [4/4]

date Qore::TimeZone::date | ( | string | dtstr,
|  | string | mask )

Returns a date/time value in the current TimeZone corresponding to parsing a string argument according to a format mask.

Code Flags:
  RET_VALUE_ONLY

Parameters

  dtstr | a string giving a date
  mask | the mask for the date value; see Date Mask Format for information on the format of the format mask

Returns
  the date/time value in the current TimeZone corresponding to parsing the dtstr string argument according to mask serving as a format mask

Example:
  TimeZone tz("Europe/London");
  printf("%y\n", tz.date("05/02/2012", "DD/MM/YYYY")); # outputs: 2012-02-05 00:00:00 Sun Z (GMT)

Exceptions

  DATE-CONVERT-ERROR | invalid mask specification

See also
  similar to but more useful than Qore::date(string, string)

Since
  Qore 0.8.6

## dateMs()

date Qore::TimeZone::dateMs | ( | softint | ms | ) |

Returns a date in the object's zone based on an offsets in milliseconds from `1970-01-01Z`.

Code Flags:
  CONSTANT

Parameters

  ms | an offsets in milliseconds from `1970-01-01Z`

Returns
  a date in the object's zone based on the given offsets in milliseconds from `1970-01-01Z`

Example:
  date dt = tz.dateMs(offset_ms);

## dateUs()

date Qore::TimeZone::dateUs | ( | softint | us | ) |

Returns a date in the object's zone based on an offsets in microseconds from `1970-01-01Z`.

Code Flags:
  CONSTANT

Parameters

  us | an offsets in microseconds from `1970-01-01Z`

Returns
  a date in the object's zone based on the given offsets in microseconds from `1970-01-01Z`

Example:
  date dt = tz.dateUs(offset_uss);

## get()

static TimeZone Qore::TimeZone::get | ( |  | ) |

static

Returns a TimeZone object for the current time zone.

Returns
  a TimeZone object for the current time zone

Code Flags:
  CONSTANT

Example:
  TimeZone tz = TimeZone::get();

## hasDST()

bool Qore::TimeZone::hasDST | ( |  | ) |

Returns True if the zone has daylight saving time rules, False if not.

TimeZone objects based on zoneinfo region files (on UNIX) or registry information (on Windows) can have (but do not necessarily have) daylight savings time information; those based on UTC offsets have none

Returns
  True if the current zone has daylight saving time rules, False if not

Code Flags:
  CONSTANT

Example:
  bool hasdst = tz.hasDST();

## region()

string Qore::TimeZone::region | ( |  | ) |

Returns the region name as a string; if the current zone is based on a UTC offset, then the UTC offset is returned as a string like `"+01:00"`.

Returns
  the region name as a string; if the current zone is based on a UTC offset, then the UTC offset is returned as a string like `"+01:00"`

Code Flags:
  CONSTANT

Example:
  string region = tz.region();

## set()

static nothing Qore::TimeZone::set | ( | TimeZone | zone | ) |

static

Sets the time zone for the current Program object from a TimeZone object.

Restrictions:
  Qore::PO_NO_LOCALE_CONTROL

Parameters

  zone | the time zone to set

Example:
  TimeZone tz("Europe/Prague");
  TimeZone::set(tz);

## setRegion()

static nothing Qore::TimeZone::setRegion | ( | string | region | ) |

static

Sets the time zone for the current Program object from a time zone region name.

Restrictions:
  Qore::PO_NO_LOCALE_CONTROL

Parameters

  region | the region name to set

Note
  On Windows you can use both zoneinfo region names (ex: `"Europe/Prague"`) as well as the Windows registry keys under `HKEY_LOCAL_MACHINE SOFTWARE\Microsoft\Windows NT\CurrentVersion\Time Zones` (ex: `"Central Europe Standard Time"`); note that in this case the Windows-style names will only be used to load the timezone info from registry and the name will then be converted to the first corresponding zoneinfo region according to alphabet (ex: `"Central Europe Standard Time"` -> `"Europe/Belgrade"`).

Example:
  TimeZone::setRegion("Europe/Prague");

## setUTCOffset()

static nothing Qore::TimeZone::setUTCOffset | ( | softint | seconds_east | ) |

static

Sets the time zone for the current Program object from an integer offset in seconds east of UTC.

Restrictions:
  Qore::PO_NO_LOCALE_CONTROL

Parameters

  seconds_east | the number of seconds east of UTC for the new time zone (negative numbers give seconds west of UTC)

Example:
  TimeZone::setUTCOffset(3600);

## UTCOffset()

int Qore::TimeZone::UTCOffset | ( |  | ) |

Returns the number of seconds east of UTC for the zone; negative numbers indicate a zone west of UTC.

Returns
  the number of seconds east of UTC for the zone; negative numbers indicate a zone west of UTC

Code Flags:
  CONSTANT

Example:
  int offset = tz.UTCOffset();