Horde_ActiveSync_Timezone
in package
Utility functions for dealing with Microsoft ActiveSync's Timezone format.
Copyright 2009-2017 Horde LLC (http://www.horde.org/)
See the enclosed file LICENSE for license information. If you did not receive this file, see http://www.horde.org/licenses/gpl.
Code dealing with searching for a timezone identifier from an AS timezone blob inspired by code in the Tine20 Project (http://tine20.org).
Tags
Table of Contents
- $_startDate : Horde_Date
- Date to use as start date when iterating through offsets looking for a transition.
- getListOfTimezones() : array<string|int, mixed>
- Get the list of timezone identifiers that match the given offsets, having a preference for $expectedTimezone if it's present in the results.
- getOffsetsFromDate() : array<string|int, mixed>
- Create a offset hash suitable for use in ActiveSync transactions
- getOffsetsFromSyncTZ() : array<string|int, mixed>
- Convert a timezone from the ActiveSync base64 structure to a TZ offset hash.
- getSyncTZFromOffsets() : string
- Build an ActiveSync TZ blob given a TZ Offset hash.
- getTimezone() : string
- Attempt to guess the timezone identifier from the $offsets array.
- _chbo() : int
- Change the byte order of a number. Used to allow big endian machines to decode the timezone blobs, which are encoded in little endian order.
- _checkTimezone() : array<string|int, mixed>|bool
- Check if the given timezone matches the offsets and also evaluate the daylight saving time transitions for this timezone if necessary.
- _checkTransition() : bool
- Check if the given standardTransition and daylightTransition match to the given offsets.
- _generateOffsetsForTransition() : array<string|int, mixed>
- Calculate the offsets for the specified transition
- _getTransitions() : array<string|int, mixed>
- Get the transition data for moving from DST to STD time.
- _isNthOcurrenceOfWeekdayInMonth() : bool
- Test if the weekday of the given timestamp is the nth occurence of this weekday within its month, where '5' indicates the last occurrence even if there is less than five occurrences.
- _setDefaultStartDate() : mixed
- Set default value for $_startDate.
Properties
$_startDate
Date to use as start date when iterating through offsets looking for a transition.
protected
Horde_Date
$_startDate
Methods
getListOfTimezones()
Get the list of timezone identifiers that match the given offsets, having a preference for $expectedTimezone if it's present in the results.
public
getListOfTimezones(array<string|int, mixed>|string $offsets[, string $expectedTimezone = null ]) : array<string|int, mixed>
Parameters
- $offsets : array<string|int, mixed>|string
-
Either an offset array, or a AS timezone structure.
- $expectedTimezone : string = null
-
The expected timezone.
Return values
array<string|int, mixed> —An array of timezone identifiers
getOffsetsFromDate()
Create a offset hash suitable for use in ActiveSync transactions
public
static getOffsetsFromDate(Horde_Date $date) : array<string|int, mixed>
Parameters
- $date : Horde_Date
-
A date object representing the date to base the the tz data on.
Return values
array<string|int, mixed> —An offset hash.
getOffsetsFromSyncTZ()
Convert a timezone from the ActiveSync base64 structure to a TZ offset hash.
public
static getOffsetsFromSyncTZ(mixed $data) : array<string|int, mixed>
Parameters
- $data : mixed
Return values
array<string|int, mixed> —Hash of offset information
getSyncTZFromOffsets()
Build an ActiveSync TZ blob given a TZ Offset hash.
public
static getSyncTZFromOffsets(array<string|int, mixed> $offsets) : string
Parameters
- $offsets : array<string|int, mixed>
-
A TZ offset hash
Return values
string —A base64_encoded ActiveSync Timezone structure suitable for transmitting via wbxml.
getTimezone()
Attempt to guess the timezone identifier from the $offsets array.
public
getTimezone(array<string|int, mixed>|string $offsets[, string $expectedTimezone = null ]) : string
Parameters
- $offsets : array<string|int, mixed>|string
-
The timezone to check. Either an array of offsets or an activesynz tz blob.
- $expectedTimezone : string = null
-
The expected timezone. If not empty, and present in the results, will return.
Return values
string —The timezone identifier
_chbo()
Change the byte order of a number. Used to allow big endian machines to decode the timezone blobs, which are encoded in little endian order.
protected
static _chbo(int $num) : int
Parameters
- $num : int
-
The number to reverse.
Return values
int —The number, in the reverse byte order.
_checkTimezone()
Check if the given timezone matches the offsets and also evaluate the daylight saving time transitions for this timezone if necessary.
protected
_checkTimezone(DateTimeZone $timezone, array<string|int, mixed> $offsets) : array<string|int, mixed>|bool
Parameters
- $timezone : DateTimeZone
-
The timezone to check.
- $offsets : array<string|int, mixed>
-
The offsets to check.
Return values
array<string|int, mixed>|bool —An array of transition data or false if timezone does not match offset.
_checkTransition()
Check if the given standardTransition and daylightTransition match to the given offsets.
protected
_checkTransition(array<string|int, mixed> $std, array<string|int, mixed> $dst, array<string|int, mixed> $offsets) : bool
Parameters
- $std : array<string|int, mixed>
-
The Standard transition date.
- $dst : array<string|int, mixed>
-
The DST transition date.
- $offsets : array<string|int, mixed>
-
The offsets to check.
Return values
bool —_generateOffsetsForTransition()
Calculate the offsets for the specified transition
protected
static _generateOffsetsForTransition(array<string|int, mixed> $offsets, array<string|int, mixed> $transition, string $type) : array<string|int, mixed>
Parameters
- $offsets : array<string|int, mixed>
-
A TZ offset hash
- $transition : array<string|int, mixed>
-
A transition hash
- $type : string
-
Transition type - dst or std
Return values
array<string|int, mixed> —A populated offset hash
_getTransitions()
Get the transition data for moving from DST to STD time.
protected
static _getTransitions(DateTimeZone $timezone, Horde_Date $date) : array<string|int, mixed>
Parameters
- $timezone : DateTimeZone
-
The timezone to get the transition for
- $date : Horde_Date
-
The date to start from. Really only the year we are interested in is needed.
Return values
array<string|int, mixed> —An array containing the the STD and DST transitions
_isNthOcurrenceOfWeekdayInMonth()
Test if the weekday of the given timestamp is the nth occurence of this weekday within its month, where '5' indicates the last occurrence even if there is less than five occurrences.
protected
static _isNthOcurrenceOfWeekdayInMonth(int $timestamp, int $occurence) : bool
Parameters
- $timestamp : int
-
The timestamp to check.
- $occurence : int
-
1 to 5, where 5 indicates the final occurrence during the month if that day of the week does not occur 5 times
Return values
bool —_setDefaultStartDate()
Set default value for $_startDate.
protected
_setDefaultStartDate([array<string|int, mixed> $offsets = null ]) : mixed
Tries to guess the correct startDate depending on object property falls back to current date.
Parameters
- $offsets : array<string|int, mixed> = null
-
Offsets may be avaluated for a given start year