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Java example source code file (key_format.xml)
This example Java source code file (key_format.xml) is included in the alvinalexander.com
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The key_format.xml Java example source code
<?xml version="1.0" encoding="ISO-8859-1"?>
<document>
<properties>
<title>Java date and time API - Formatting
<author>Stephen Colebourne
</properties>
<body>
<section name="Formatting">
<p>
Joda-Time provides a comprehensive formatting system.
There are two layers:
</p>
<ul>
<li>High level - pre-packaged constant formatters
<li>Mid level - pattern-based, like SimpleDateFormat
<li>Low level - builder
</ul>
</section>
<section name="Constant and Localized formatting">
<p>
The class <code>ISODateTimeFormat
contains a large number of pre-defined formatters based on the ISO-8601
specification (although not all are fully compatible).
These handle many common cases.
</p>
<p>
The class <code>DateTimeFormat
contains an additional set of pre-defined formatters based on <code>Locale.
These "style-based" formatters handle the case where the application needs to
format a date-time in a manner appropriate to a particular global location.
</p>
</section>
<section name="Pattern-based formatting">
<p>
The class <code>DateTimeFormat
provides a single method <code>forPattern(String) that supports formatting by pattern.
These "pattern-based" formatters provide a similar approach to that of <code>SimpleDateFormat.
</p>
<p>
For example:
</p>
<source>
LocalDate date = LocalDate.now();
DateTimeFormatter fmt = DateTimeFormat.forPattern("d MMMM, yyyy");
String str = date.toString(fmt);
// might output "6 October, 2013"
</source>
<p>
The <a href="apidocs/org/joda/time/format/DateTimeFormat.html">pattern letters are:
</p>
<source>
Symbol Meaning Presentation Examples
------ ------- ------------ -------
G era text AD
C century of era (>=0) number 20
Y year of era (>=0) year 1996
x weekyear year 1996
w week of weekyear number 27
e day of week number 2
E day of week text Tuesday; Tue
y year year 1996
D day of year number 189
M month of year month July; Jul; 07
d day of month number 10
a halfday of day text PM
K hour of halfday (0~11) number 0
h clockhour of halfday (1~12) number 12
H hour of day (0~23) number 0
k clockhour of day (1~24) number 24
m minute of hour number 30
s second of minute number 55
S fraction of second number 978
z time zone text Pacific Standard Time; PST
Z time zone offset/id zone -0800; -08:00; America/Los_Angeles
' escape for text delimiter
'' single quote literal '
</source>
<p>
The count of pattern letters determine the format.
</p>
<p>
Text: If the number of pattern letters is 4 or more, the full form is used;
otherwise a short or abbreviated form is used if available.
Thus, "EEEE" might output "Monday" whereas "E" might output "Mon" (the short form of Monday).
</p>
<p>
Number: The minimum number of digits. Shorter numbers are zero-padded to this amount.
Thus, "HH" might output "09" whereas "H" might output "9" (for the hour-of-day of 9 in the morning).
</p>
<p>
Year: Numeric presentation for year and weekyear fields are handled specially.
For example, if the count of 'y' is 2, the year will be displayed as the zero-based
year of the century, which is two digits.
</p>
<p>
Month: 3 or over, use text, otherwise use number.
Thus, "MM" might output "03" whereas "MMM" might output "Mar" (the short form of March)
and "MMMM" might output "March".
</p>
<p>
Zone: 'Z' outputs offset without a colon, 'ZZ' outputs the offset with a colon, 'ZZZ' or more outputs the zone id.
</p>
<p>
Zone names: Time zone names ('z') cannot be parsed.
</p>
<p>
Any characters in the pattern that are not in the ranges of ['a'..'z'] and ['A'..'Z']
will be treated as quoted text. For instance, characters like ':', '.', ' ', '#' and '?'
will appear in the resulting time text even they are not embraced within single quotes.
</p>
</section>
<section name="Builder">
<p>
All formatting is ultimately built using
<code>DateTimeFormatterBuilder.
The builder allows a format pattern to be built up step by step, consisting of
literal, text, numeric, pattern and localized elements in any order.
Some facilities are only available via the builder.
</p>
<p>
For example, this will build a formatter consisting of the month and year:
</p>
<source>
DateTimeFormatter monthAndYear = new DateTimeFormatterBuilder()
.appendMonthOfYearText()
.appendLiteral(' ')
.appendYear(4, 4)
.toFormatter();
</source>
<p>
<br />
</p>
</section>
</body>
</document>
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