Qore Programming Language Reference Manual 0.8.8

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Qore::TimeZone Class Reference

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

## Public Member Functions
int | UTCOffset ()
| Returns the number of seconds east of UTC for the zone; negative numbers indicate a zone west of UTC. More...
| constructor (string region)
| Creates the TimeZone object based on the region name (ex: `"America/Chicago"`) More...
| constructor (softint seconds_east)
| Creates the TimeZone object based on the number of seconds east of UTC (3600 = UTC +01) More...
| copy ()
| Creates a copy of the TimeZone object. More...
date | date (softint secs, softint us=0)
| Returns the equivalent date in the time zone of the current object. More...
date | date (date d)
| Returns the equivalent date in the time zone of the current object. More...
date | date (string dtstr)
| Returns the equivalent date in the time zone of the current object. More...
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. More...
date | dateMs (softint ms)
| Returns a date in the object's zone based on an offsets in milliseconds from `1970-01-01Z`. More...
date | dateUs (softint us)
| Returns a date in the object's zone based on an offsets in microseconds from `1970-01-01Z`. More...
bool | hasDST ()
| Returns True if the zone has daylight saving's time rules, False if not. More...
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"`. More...

## Static Public Member Functions
static TimeZone | get ()
| Returns a TimeZone object for the current time zone. More...
static nothing | set (TimeZone zone)
| Sets the time zone for the current Program object from a TimeZone object. More...
static nothing | setRegion (string region)
| Sets the time zone for the current Program object from a time zone region name. More...
static nothing | setUTCOffset (softint seconds_east)
| Sets the time zone for the current Program object from an integer offset in seconds east of UTC. More...

## 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.

## Member Function Documentation

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 the region names correspond to registry entries under `HKEY_LOCAL_MACHINE SOFTWARE\Microsoft\Windows NT\CurrentVersion\Time Zones` (ex: `"Central Europe Standard Time"`)

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

Exceptions

  TZINFO-ERROR | Unable to read zoneinfo file; invalid file magic; error parsing zoneinfo file, etc

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:
  my TimeZone $tz(3600);

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

Creates a copy of the TimeZone object.

Example:
  my TimeZone $newzone = $tz.copy();

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:
  my date $dt = $tz.date($secs);

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

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

Since
  Qore 0.8.4

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:
  my 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

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:
  my date $dt = $tz.dateMs($offset_ms);

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:
  my date $dt = $tz.dateUs($offset_uss);

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:
  my TimeZone $tz = TimeZone::get();

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

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

Code Flags:
  CONSTANT

Example:
  my bool $hasdst = $tz.hasDST();

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:
  my string $region = $tz.region();

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:
  my TimeZone $tz("Europe/Prague");
  TimeZone::set($tz);

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 the region names correspond to registry entries under `HKEY_LOCAL_MACHINE SOFTWARE\Microsoft\Windows NT\CurrentVersion\Time Zones` (ex: `"Central` Europe Standard Time)

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

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);

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:
  my int $offset = $tz.UTCOffset();