net.yura.mobile.util

Class DateParser

java.lang.Object

net.yura.mobile.util.DateParser

public class DateParser
extends java.lang.Object

This class implements somewhat of a subset of the J2SE Date class. However, since the semantics of parse() is slightly different (DateParser will not handle dates prior to 1/1/1970, amd to be able to provide methods that will set timezone and DST information, it is called DateParser.

Field Summary

Fields

Modifier and Type	Field and Description
protected int	day The day of the month represented by this date
protected int	hour The hour represented by this date
protected static int	local_tz The offset, in milliseconds, from GMT for the local time zone
protected int	milli The millisecond represented by this date
protected int	minute The minute represented by this date
protected int	month The month represented by this date
protected int	second The second represented by this date
protected int	tzoffset The offset, in milliseconds, from GMT represented by this date
protected int	year The year represented by this date

Constructor Summary

Constructors

Constructor and Description
DateParser(java.lang.String s) Allocates a DateParser object and initializes it so that it represents the date and time indicated by the string s, which is interpreted as if by the parse(java.lang.String) method.
DateParser(java.lang.String s, boolean iso) Allocates a DateParser object and initializes it so that it represents the date and time indicated by the string s, which is interpreted as if by the parse(java.lang.String) method.

Method Summary

Modifier and Type	Method and Description
int	getHour() Get the hour represented by this date.
int	getMinute() Get the minute represented by this date.
static long	parse(java.lang.String s) Attempts to interpret the string s as a representation of a date and time.
static long	parseISO(java.lang.String date) Parses a date string according to the ISO 8601 standard.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

year

protected int year

The year represented by this date

month

protected int month

The month represented by this date

day

protected int day

The day of the month represented by this date

hour

protected int hour

The hour represented by this date

minute

protected int minute

The minute represented by this date

second

protected int second

The second represented by this date

milli

protected int milli

The millisecond represented by this date

tzoffset

protected int tzoffset

The offset, in milliseconds, from GMT represented by this date

local_tz

protected static int local_tz

The offset, in milliseconds, from GMT for the local time zone

Constructor Detail

DateParser

public DateParser(java.lang.String s)

Allocates a DateParser object and initializes it so that it represents the date and time indicated by the string s, which is interpreted as if by the parse(java.lang.String) method.

Parameters:

s - a string representation of the date.

DateParser

public DateParser(java.lang.String s,
                  boolean iso)

Allocates a DateParser object and initializes it so that it represents the date and time indicated by the string s, which is interpreted as if by the parse(java.lang.String) method.

Parameters:

s - a string representation of the date.

Method Detail

parse

public static long parse(java.lang.String s)

Attempts to interpret the string s as a representation of a date and time. If the attempt is successful, the time indicated is returned represented as teh distance, measured in milliseconds, of that time from the epoch (00:00:00 GMT on January 1, 1970). If the attempt fails, an IllegalArgumentException is thrown.

It accepts many syntaxes; in particular, it recognizes the IETF standard date syntax: "Sat, 12 Aug 1995 13:30:00 GMT". It also understands the continental U.S. time-zone abbreviations, but for general use, a time-zone offset should be used: "Sat, 12 Aug 1995 13:30:00 GMT+0430" (4 hours, 30 minutes west of the Greenwich meridian). If no time zone is specified, the local time zone is assumed. GMT and UTC are considered equivalent.

The string s is processed from left to right, looking for data of interest. Any material in s that is within the ASCII parenthesis characters ( and ) is ignored. Parentheses may be nested. Otherwise, the only characters permitted within s are these ASCII characters:

 abcdefghijklmnopqrstuvwxyz
 ABCDEFGHIJKLMNOPQRSTUVWXYZ
 0123456789,+-:/

and whitespace characters.

A consecutive sequence of decimal digits is treated as a decimal number:

• If a number is preceded by + or - and a year has already been recognized, then the number is a time-zone offset. If the number is less than 24, it is an offset measured in hours. Otherwise, it is regarded as an offset in minutes, expressed in 24-hour time format without punctuation. A preceding - means a westward offset. Time zone offsets are always relative to UTC (Greenwich). Thus, for example, -5 occurring in the string would mean "five hours west of Greenwich" and +0430 would mean "four hours and thirty minutes east of Greenwich." It is permitted for the string to specify GMT, UT, or UTC redundantly-for example, GMT-5 or utc+0430.
• If a number is greater than 70, it is regarded as a year number. It must be followed by a space, comma, slash, or end of string.
• If the number is followed by a colon, it is regarded as an hour, unless an hour has already been recognized, in which case it is regarded as a minute.
• If the number is followed by a slash, it is regarded as a month (it is decreased by 1 to produce a number in the range 0 to 11), unless a month has already been recognized, in which case it is regarded as a day of the month.
• If the number is followed by whitespace, a comma, a hyphen, or end of string, then if an hour has been recognized but not a minute, it is regarded as a minute; otherwise, if a minute has been recognized but not a second, it is regarded as a second; otherwise, it is regarded as a day of the month.

A consecutive sequence of letters is regarded as a word and treated as follows:

• A word that matches AM, ignoring case, is ignored (but the parse fails if an hour has not been recognized or is less than 1 or greater than 12).
• A word that matches PM, ignoring case, adds 12 to the hour (but the parse fails if an hour has not been recognized or is less than 1 or greater than 12).
• Any word that matches any prefix of SUNDAY, MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, or SATURDAY, ignoring case, is ignored. For example, sat, Friday, TUE, and Thurs are ignored.
• Otherwise, any word that matches any prefix of JANUARY, FEBRUARY, MARCH, APRIL, MAY, JUNE, JULY, AUGUST, SEPTEMBER, OCTOBER, NOVEMBER, or DECEMBER, ignoring case, and considering them in the order given here, is recognized as specifying a month and is converted to a number (0 to 11). For example, aug, Sept, april, and NOV are recognized as months. So is Ma, which is recognized as MARCH, not MAY.
• Any word that matches GMT, UT, or UTC, ignoring case, is treated as referring to UTC.
• Any word that matches EST, CST, MST, or PST, ignoring case, is recognized as referring to the time zone in North America that is five, six, seven, or eight hours west of Greenwich, respectively. Any word that matches EDT, CDT, MDT, or PDT, ignoring case, is recognized as referring to the same time zone, respectively, during daylight saving time.

Once the entire string s has been scanned, it is converted to a time result in one of two ways. If a time zone or time-zone offset has been recognized, then the year, month, day of month, hour, minute, and second are interpreted in UTC and then the time-zone offset is applied. Otherwise, the year, month, day of month, hour, minute, and second are interpreted in the local time zone.

Parameters:

s - a string to be parsed as a date.

Returns:

the distance in milliseconds from January 1, 1970, 00:00:00 GMT represented by the string argument. Note that this method will throw an IllegalArgumentException if the year indicated in s is less than 1583.

parseISO

public static long parseISO(java.lang.String date)

Parses a date string according to the ISO 8601 standard.

Parameters:

date - the date string in the format YYYY-MM-DDTHH:MM[:SS][[+|-] HH[MM]]

Returns:

the number of milliseconds elapsed since 1970-1-1 GMT to this date

Throws:

java.lang.IllegalArgumentException - if the format of the date string is incorrect or the date is invalid

getHour

public int getHour()

Get the hour represented by this date.

Returns:

The hour.

getMinute

public int getMinute()

Get the minute represented by this date.

Returns:

The minute.