Timezone handling routines. More...

Typedefs
typedef struct _icaltimezone	icaltimezone
	An opaque struct representing a timezone. We declare this here to avoid a circular dependancy.

Functions
void	free_zone_directory (void)

void	icaltimezone_array_append_from_vtimezone (icalarray timezones, icalcomponent child)

void	icaltimezone_array_free (icalarray *timezones)

icalarray *	icaltimezone_array_new (void)

void	icaltimezone_convert_time (struct icaltimetype tt, icaltimezone from_zone, icaltimezone *to_zone)

icaltimezone *	icaltimezone_copy (icaltimezone *originalzone)

int	icaltimezone_dump_changes (icaltimezone zone, int max_year, FILE fp)
	Outputs a list of timezone changes for the given timezone to the given file, up to the maximum year given. More...

void	icaltimezone_expand_vtimezone (icalcomponent comp, int end_year, icalarray changes)

void	icaltimezone_free (icaltimezone *zone, int free_struct)
	Frees all memory used for the icaltimezone. More...

void	icaltimezone_free_builtin_timezones (void)
	Releases builtin timezone memory.

icaltimezone *	icaltimezone_get_builtin_timezone (const char *location)
	Returns a single builtin timezone, given its Olson city name.

icaltimezone *	icaltimezone_get_builtin_timezone_from_offset (int offset, const char *tzname)
	Returns a single builtin timezone, given its offset from UTC.

icaltimezone *	icaltimezone_get_builtin_timezone_from_tzid (const char *tzid)
	Returns a single builtin timezone, given its TZID.

icalarray *	icaltimezone_get_builtin_timezones (void)
	Returns an icalarray of icaltimezone structs, one for each builtin timezone. More...

int	icaltimezone_get_builtin_tzdata (void)

icalcomponent *	icaltimezone_get_component (icaltimezone *zone)
	Returns the VTIMEZONE component of a timezone.

const char *	icaltimezone_get_display_name (icaltimezone *zone)
	Returns the timezone name to display to the user. More...

double	icaltimezone_get_latitude (icaltimezone *zone)
	Returns the latitude of a builtin timezone.

const char *	icaltimezone_get_location (icaltimezone *zone)

char *	icaltimezone_get_location_from_vtimezone (icalcomponent *component)
	Gets the LOCATION or X-LIC-LOCATION property from a VTIMEZONE.

double	icaltimezone_get_longitude (icaltimezone *zone)
	Returns the longitude of a builtin timezone.

const char *	icaltimezone_get_tzid (icaltimezone *zone)

const char *	icaltimezone_get_tznames (icaltimezone *zone)

char *	icaltimezone_get_tznames_from_vtimezone (icalcomponent *component)
	Gets the TZNAMEs used for the last STANDARD & DAYLIGHT components in a VTIMEZONE. More...

int	icaltimezone_get_utc_offset (icaltimezone zone, struct icaltimetype tt, int *is_daylight)
	Calculates the UTC offset of a given local time in the given timezone. More...

int	icaltimezone_get_utc_offset_of_utc_time (icaltimezone zone, struct icaltimetype tt, int *is_daylight)
	Calculates the UTC offset of a given UTC time in the given timezone. More...

icaltimezone *	icaltimezone_get_utc_timezone (void)
	Returns the UTC timezone.

icaltimezone *	icaltimezone_new (void)
	Creates a new icaltimezone.

void	icaltimezone_release_zone_tab (void)

void	icaltimezone_set_builtin_tzdata (int set)

int	icaltimezone_set_component (icaltimezone zone, icalcomponent comp)
	Sets the VTIMEZONE component of an icaltimezone, initializing the tzid, location & tzname fields. More...

void	icaltimezone_set_tzid_prefix (const char *new_prefix)

void	icaltimezone_truncate_vtimezone (icalcomponent *vtz, icaltimetype start, icaltimetype end, int ms_compatible)

const char *	icaltimezone_tzid_prefix (void)

void	set_zone_directory (const char *path)

Detailed Description

Timezone handling routines.

Function Documentation

◆ free_zone_directory()

void free_zone_directory ( void )

Frees the memory dedicated to the zonefile directory

◆ icaltimezone_dump_changes()

int icaltimezone_dump_changes	(	icaltimezone *	zone,
		int	max_year,
		FILE *	fp
	)

Outputs a list of timezone changes for the given timezone to the given file, up to the maximum year given.

We compare this output with the output from 'vzic –dump-changes' to make sure that we are consistent. (vzic is the Olson timezone database to VTIMEZONE converter.)

The output format is:

 Zone-Name [tab] Date [tab] Time [tab] UTC-Offset

The Date and Time fields specify the time change in UTC.

The UTC Offset is for local (wall-clock) time. It is the amount of time to add to UTC to get local time.

◆ icaltimezone_free()

void icaltimezone_free	(	icaltimezone *	zone,
		int	free_struct
	)

Frees all memory used for the icaltimezone.

Parameters

zone	The icaltimezone to be freed
free_struct	Whether to free the icaltimezone struct as well

◆ icaltimezone_get_builtin_timezones()

icalarray* icaltimezone_get_builtin_timezones ( void )

Returns an icalarray of icaltimezone structs, one for each builtin timezone.

This will load and parse the zones.tab file to get the timezone names and their coordinates. It will not load the VTIMEZONE data for any timezones.

◆ icaltimezone_get_display_name()

const char* icaltimezone_get_display_name ( icaltimezone * zone )

Returns the timezone name to display to the user.

We prefer to use the Olson city name, but fall back on the TZNAME, or finally the TZID. We don't want to use "" as it may be wrongly interpreted as a floating time. Do not free the returned string.

◆ icaltimezone_get_location()

const char* icaltimezone_get_location ( icaltimezone * zone )

Returns the city name of a timezone.

◆ icaltimezone_get_tzid()

const char* icaltimezone_get_tzid ( icaltimezone * zone )

Returns the TZID of a timezone.

◆ icaltimezone_get_tznames()

const char* icaltimezone_get_tznames ( icaltimezone * zone )

Returns the TZNAME properties used in the latest STANDARD and DAYLIGHT components. If they are the same it will return just one, e.g. "LMT". If they are different it will format them like "EST/EDT". Note that this may also return NULL.

◆ icaltimezone_get_tznames_from_vtimezone()

char* icaltimezone_get_tznames_from_vtimezone ( icalcomponent * component )

Gets the TZNAMEs used for the last STANDARD & DAYLIGHT components in a VTIMEZONE.

If both STANDARD and DAYLIGHT components use the same TZNAME, it returns that. If they use different TZNAMEs, it formats them like "EST/EDT". The returned string should be freed by the caller.

◆ icaltimezone_get_utc_offset()

int icaltimezone_get_utc_offset	(	icaltimezone *	zone,
		struct icaltimetype *	tt,
		int *	is_daylight
	)

Calculates the UTC offset of a given local time in the given timezone.

It is the number of seconds to add to UTC to get local time. The is_daylight flag is set to 1 if the time is in daylight-savings time.

◆ icaltimezone_get_utc_offset_of_utc_time()

int icaltimezone_get_utc_offset_of_utc_time	(	icaltimezone *	zone,
		struct icaltimetype *	tt,
		int *	is_daylight
	)

Calculates the UTC offset of a given UTC time in the given timezone.

It is the number of seconds to add to UTC to get local time. The is_daylight flag is set to 1 if the time is in daylight-savings time.

◆ icaltimezone_set_component()

int icaltimezone_set_component	(	icaltimezone *	zone,
		icalcomponent *	comp
	)

Sets the VTIMEZONE component of an icaltimezone, initializing the tzid, location & tzname fields.

Returns: 1 on success or 0 on failure, i.e. no TZID was found.

◆ icaltimezone_set_tzid_prefix()

void icaltimezone_set_tzid_prefix ( const char * new_prefix )

Sets the prefix to be used for tzid's generated from system tzdata. Must be globally unique (such as a domain name owned by the developer of the calling application), and begin and end with forward slashes. Do not change or de-allocate the string buffer after calling this.

◆ set_zone_directory()

void set_zone_directory ( const char * path )

Sets the directory to look for the zonefiles

Typedefs

Functions