net.sf.saxon.number

Class NamedTimeZone

public class NamedTimeZone extends Object

This class attempts to identify a timezone name, given the date (including the time zone offset) and the country. The process is heuristic: sometimes there is more than one timezone that matches this information, sometimes there is none, but the class simply does its best. This is in support of the XSLT format-date() function.
Field Summary
static HashMap<String,List<String>>idForCountry
Method Summary
static intcivilTimeOffset(DateTimeValue date, String olsenName)
Get the civil time offset to be made to a given date/time in a given civil timezone.
static StringformatTimeZoneOffset(DateTimeValue timeValue)
Format a timezone in numeric form for example +03:00 (or Z for +00:00)
static StringgetOlsenTimeZoneName(DateTimeValue date, String country)
Try to identify a timezone name corresponding to a given date (including time zone) and a given country.
static StringgetTimeZoneNameForDate(DateTimeValue date, String country)
Try to identify a timezone name corresponding to a given date (including time zone) and a given country.
static BooleaninSummerTime(DateTimeValue date, String region)
Determine whether a given date/time is in summer time (daylight savings time) in a given region.
static voidtz(String country, String zoneId)
Register a timezone in use in a particular country.

Field Detail

idForCountry

static HashMap<String,List<String>> idForCountry

Method Detail

civilTimeOffset

public static int civilTimeOffset(DateTimeValue date, String olsenName)
Get the civil time offset to be made to a given date/time in a given civil timezone. For example, if the timezone is America/New_York, the civil time offset will be -5 hours (= 5 x 3600000 ms) during the winter and -4 hours (=4 x 3600000 ms) during the summer

Parameters: date the date/time in question. If this has no timezone, it is assumed to be in GMT. olsenName the Olsen name of the timezone, for example Europe/Lisbon

Returns: the civil time offset, in milliseconds, to be applied to the given date/time

formatTimeZoneOffset

public static String formatTimeZoneOffset(DateTimeValue timeValue)
Format a timezone in numeric form for example +03:00 (or Z for +00:00)

Parameters: timeValue the value whose timezone is to be formatted

Returns: the formatted timezone

getOlsenTimeZoneName

public static String getOlsenTimeZoneName(DateTimeValue date, String country)
Try to identify a timezone name corresponding to a given date (including time zone) and a given country. Note that this takes account of Java's calendar of daylight savings time changes in different countries. The returned value is the Olsen time zone name, for example "Pacific/Los_Angeles", followed by an asterisk (*) if the time is in daylight savings time in that timezone.

Parameters: date the dateTimeValue, including timezone country the country, as a two-letter code

Returns: the Olsen timezone name if a timezone with the given time displacement is in use in the country in question (on the appropriate date, if known). In this case an asterisk is appended to the result if the date/time is in daylight savings time. Otherwise, the formatted (numeric) timezone offset. If the dateTimeValue supplied has no timezone, return a zero-length string.

getTimeZoneNameForDate

public static String getTimeZoneNameForDate(DateTimeValue date, String country)
Try to identify a timezone name corresponding to a given date (including time zone) and a given country. Note that this takes account of Java's calendar of daylight savings time changes in different countries. The returned value is the convenional short timezone name, for example PDT for Pacific Daylight Time

Parameters: date the dateTimeValue, including timezone country the two-letter ISO country code

Returns: the short timezone name if a timezone with the given time displacement is in use in the country in question (on the appropriate date, if known). Otherwise, the formatted (numeric) timezone offset. If the dateTimeValue supplied has no timezone, return a zero-length string.

inSummerTime

public static Boolean inSummerTime(DateTimeValue date, String region)
Determine whether a given date/time is in summer time (daylight savings time) in a given region. This relies on the Java database of changes to daylight savings time. Since summer time changes are set by civil authorities the information is not necessarily reliable when applied to dates in the future.

Parameters: date the date/time in question region either the two-letter ISO country code, or an Olsen timezone name such as "America/New_York" or "Europe/Lisbon". If the country code denotes a country spanning several timezones, such as the US, then one of them is chosen arbitrarily.

Returns: true if the date/time is known to be in summer time in the relevant country; false if it is known not to be in summer time; null if there is no timezone or if no information is available for the specified region.

tz

static void tz(String country, String zoneId)
Register a timezone in use in a particular country. Note that some countries use multiple time zones

Parameters: country the two-character code for the country zoneId the Olsen timezone name for the timezone