How to format date java
How to format date java
How to format date java
Date and Time Patterns
Date and time formats are specified by date and time pattern strings. Within date and time pattern strings, unquoted letters from ‘A’ to ‘Z’ and from ‘a’ to ‘z’ are interpreted as pattern letters representing the components of a date or time string. Text can be quoted using single quotes ( ‘ ) to avoid interpretation. «»» represents a single quote. All other characters are not interpreted; they’re simply copied into the output string during formatting or matched against the input string during parsing.
The following pattern letters are defined (all other characters from ‘A’ to ‘Z’ and from ‘a’ to ‘z’ are reserved):
For parsing, RFC 822 time zones are also accepted.
For parsing, «Z» is parsed as the UTC time zone designator. General time zones are not accepted.
If the number of pattern letters is 4 or more, IllegalArgumentException is thrown when constructing a SimpleDateFormat or applying a pattern.
SimpleDateFormat also supports localized date and time pattern strings. In these strings, the pattern letters described above may be replaced with other, locale dependent, pattern letters. SimpleDateFormat does not deal with the localization of text other than the pattern letters; that’s up to the client of the class.
Examples
Synchronization
Date formats are not synchronized. It is recommended to create separate format instances for each thread. If multiple threads access a format concurrently, it must be synchronized externally.
How to format date java
In addition to the format, formatters can be created with desired Locale, Chronology, ZoneId, and DecimalStyle.
The withLocale method returns a new formatter that overrides the locale. The locale affects some aspects of formatting and parsing. For example, the ofLocalizedDate provides a formatter that uses the locale specific date format.
The withChronology method returns a new formatter that overrides the chronology. If overridden, the date-time value is converted to the chronology before formatting. During parsing the date-time value is converted to the chronology before it is returned.
The withZone method returns a new formatter that overrides the zone. If overridden, the date-time value is converted to a ZonedDateTime with the requested ZoneId before formatting. During parsing the ZoneId is applied before the value is returned.
Predefined Formatters
| Formatter | Description | Example |
|---|---|---|
| ofLocalizedDate(dateStyle) | Formatter with date style from the locale | ‘2011-12-03’ |
| ofLocalizedTime(timeStyle) | Formatter with time style from the locale | ’10:15:30′ |
| ofLocalizedDateTime(dateTimeStyle) | Formatter with a style for date and time from the locale | ‘3 Jun 2008 11:05:30’ |
| ofLocalizedDateTime(dateStyle,timeStyle) | Formatter with date and time styles from the locale | ‘3 Jun 2008 11:05’ |
| BASIC_ISO_DATE | Basic ISO date | ‘20111203’ |
| ISO_LOCAL_DATE | ISO Local Date | ‘2011-12-03’ |
| ISO_OFFSET_DATE | ISO Date with offset | ‘2011-12-03+01:00’ |
| ISO_DATE | ISO Date with or without offset | ‘2011-12-03+01:00’; ‘2011-12-03’ |
| ISO_LOCAL_TIME | Time without offset | ’10:15:30′ |
| ISO_OFFSET_TIME | Time with offset | ’10:15:30+01:00′ |
| ISO_TIME | Time with or without offset | ’10:15:30+01:00′; ’10:15:30′ |
| ISO_LOCAL_DATE_TIME | ISO Local Date and Time | ‘2011-12-03T10:15:30’ |
| ISO_OFFSET_DATE_TIME | Date Time with Offset | 2011-12-03T10:15:30+01:00′ |
| ISO_ZONED_DATE_TIME | Zoned Date Time | ‘2011-12-03T10:15:30+01:00[Europe/Paris]’ |
| ISO_DATE_TIME | Date and time with ZoneId | ‘2011-12-03T10:15:30+01:00[Europe/Paris]’ |
| ISO_ORDINAL_DATE | Year and day of year | ‘2012-337’ |
| ISO_WEEK_DATE | Year and Week | 2012-W48-6′ |
| ISO_INSTANT | Date and Time of an Instant | ‘2011-12-03T10:15:30Z’ |
| RFC_1123_DATE_TIME | RFC 1123 / RFC 822 | ‘Tue, 3 Jun 2008 11:05:30 GMT’ |
Patterns for Formatting and Parsing
All letters ‘A’ to ‘Z’ and ‘a’ to ‘z’ are reserved as pattern letters. The following pattern letters are defined:
The count of pattern letters determines the format.
Number: If the count of letters is one, then the value is output using the minimum number of digits and without padding. Otherwise, the count of digits is used as the width of the output field, with the value zero-padded as necessary. The following pattern letters have constraints on the count of letters. Only one letter of ‘c’ and ‘F’ can be specified. Up to two letters of ‘d’, ‘H’, ‘h’, ‘K’, ‘k’, ‘m’, and ‘s’ can be specified. Up to three letters of ‘D’ can be specified.
Number/Text: If the count of pattern letters is 3 or greater, use the Text rules above. Otherwise use the Number rules above.
Fraction: Outputs the nano-of-second field as a fraction-of-second. The nano-of-second value has nine digits, thus the count of pattern letters is from 1 to 9. If it is less than 9, then the nano-of-second value is truncated, with only the most significant digits being output.
For example, ‘ppH’ outputs the hour-of-day padded on the left with spaces to a width of 2.
Any unrecognized letter is an error. Any non-letter character, other than ‘[‘, ‘]’, ‘<', '>‘, ‘#’ and the single quote will be output directly. Despite this, it is recommended to use single quotes around all characters that you want to output directly to ensure that future changes do not break your application.
Resolving
The resolve phase is controlled by two parameters, set on this class.
The withResolverFields(TemporalField. ) parameter allows the set of fields that will be resolved to be filtered before resolving starts. For example, if the formatter has parsed a year, month, day-of-month and day-of-year, then there are two approaches to resolve a date: (year + month + day-of-month) and (year + day-of-year). The resolver fields allows one of the two approaches to be selected. If no resolver fields are set then both approaches must result in the same date.
Class SimpleDateFormat
Date and Time Patterns
Date and time formats are specified by date and time pattern strings. Within date and time pattern strings, unquoted letters from ‘A’ to ‘Z’ and from ‘a’ to ‘z’ are interpreted as pattern letters representing the components of a date or time string. Text can be quoted using single quotes ( ‘ ) to avoid interpretation. «»» represents a single quote. All other characters are not interpreted; they’re simply copied into the output string during formatting or matched against the input string during parsing.
The following pattern letters are defined (all other characters from ‘A’ to ‘Z’ and from ‘a’ to ‘z’ are reserved):
For parsing, RFC 822 time zones are also accepted.
For parsing, «Z» is parsed as the UTC time zone designator. General time zones are not accepted.
If the number of pattern letters is 4 or more, IllegalArgumentException is thrown when constructing a SimpleDateFormat or applying a pattern.
SimpleDateFormat also supports localized date and time pattern strings. In these strings, the pattern letters described above may be replaced with other, locale dependent, pattern letters. SimpleDateFormat does not deal with the localization of text other than the pattern letters; that’s up to the client of the class.
Examples
Synchronization
Date formats are not synchronized. It is recommended to create separate format instances for each thread. If multiple threads access a format concurrently, it must be synchronized externally.
How to format date java
In addition to the format, formatters can be created with desired Locale, Chronology, ZoneId, and DecimalStyle.
The withLocale method returns a new formatter that overrides the locale. The locale affects some aspects of formatting and parsing. For example, the ofLocalizedDate provides a formatter that uses the locale specific date format.
The withChronology method returns a new formatter that overrides the chronology. If overridden, the date-time value is converted to the chronology before formatting. During parsing the date-time value is converted to the chronology before it is returned.
The withZone method returns a new formatter that overrides the zone. If overridden, the date-time value is converted to a ZonedDateTime with the requested ZoneId before formatting. During parsing the ZoneId is applied before the value is returned.
Predefined Formatters
| Formatter | Description | Example |
|---|---|---|
| ofLocalizedDate(dateStyle) | Formatter with date style from the locale | ‘2011-12-03’ |
| ofLocalizedTime(timeStyle) | Formatter with time style from the locale | ’10:15:30′ |
| ofLocalizedDateTime(dateTimeStyle) | Formatter with a style for date and time from the locale | ‘3 Jun 2008 11:05:30’ |
| ofLocalizedDateTime(dateStyle,timeStyle) | Formatter with date and time styles from the locale | ‘3 Jun 2008 11:05’ |
| BASIC_ISO_DATE | Basic ISO date | ‘20111203’ |
| ISO_LOCAL_DATE | ISO Local Date | ‘2011-12-03’ |
| ISO_OFFSET_DATE | ISO Date with offset | ‘2011-12-03+01:00’ |
| ISO_DATE | ISO Date with or without offset | ‘2011-12-03+01:00’; ‘2011-12-03’ |
| ISO_LOCAL_TIME | Time without offset | ’10:15:30′ |
| ISO_OFFSET_TIME | Time with offset | ’10:15:30+01:00′ |
| ISO_TIME | Time with or without offset | ’10:15:30+01:00′; ’10:15:30′ |
| ISO_LOCAL_DATE_TIME | ISO Local Date and Time | ‘2011-12-03T10:15:30’ |
| ISO_OFFSET_DATE_TIME | Date Time with Offset | ‘2011-12-03T10:15:30+01:00’ |
| ISO_ZONED_DATE_TIME | Zoned Date Time | ‘2011-12-03T10:15:30+01:00[Europe/Paris]’ |
| ISO_DATE_TIME | Date and time with ZoneId | ‘2011-12-03T10:15:30+01:00[Europe/Paris]’ |
| ISO_ORDINAL_DATE | Year and day of year | ‘2012-337’ |
| ISO_WEEK_DATE | Year and Week | ‘2012-W48-6’ |
| ISO_INSTANT | Date and Time of an Instant | ‘2011-12-03T10:15:30Z’ |
| RFC_1123_DATE_TIME | RFC 1123 / RFC 822 | ‘Tue, 3 Jun 2008 11:05:30 GMT’ |
Patterns for Formatting and Parsing
The count of pattern letters determines the format.
Number: If the count of letters is one, then the value is output using the minimum number of digits and without padding. Otherwise, the count of digits is used as the width of the output field, with the value zero-padded as necessary. The following pattern letters have constraints on the count of letters. Only one letter of ‘c’ and ‘F’ can be specified. Up to two letters of ‘d’, ‘H’, ‘h’, ‘K’, ‘k’, ‘m’, and ‘s’ can be specified. Up to three letters of ‘D’ can be specified.
Number/Text: If the count of pattern letters is 3 or greater, use the Text rules above. Otherwise use the Number rules above.
Fraction: Outputs the nano-of-second field as a fraction-of-second. The nano-of-second value has nine digits, thus the count of pattern letters is from 1 to 9. If it is less than 9, then the nano-of-second value is truncated, with only the most significant digits being output.
For example, ‘ppH’ outputs the hour-of-day padded on the left with spaces to a width of 2.
Any unrecognized letter is an error. Any non-letter character, other than ‘[‘, ‘]’, ‘<', '>‘, ‘#’ and the single quote will be output directly. Despite this, it is recommended to use single quotes around all characters that you want to output directly to ensure that future changes do not break your application.
Resolving
The resolve phase is controlled by two parameters, set on this class.
The withResolverFields(TemporalField. ) parameter allows the set of fields that will be resolved to be filtered before resolving starts. For example, if the formatter has parsed a year, month, day-of-month and day-of-year, then there are two approaches to resolve a date: (year + month + day-of-month) and (year + day-of-year). The resolver fields allows one of the two approaches to be selected. If no resolver fields are set then both approaches must result in the same date.
How to format a date in java?
How can change this date format «2011-09-07T00:00:00+02:00» into the «dd.MM.» i.e «07.09.»
Thanks in advance!
4 Answers 4
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here is a sample
edited the code:
Create a date format object from the above string
Parse into a date object, and reformat however you prefer.
For example (I haven’t tested this):
Your code needs a little correction on the following line
In place of (0,9) you need to enter (0,10) and you will be getting the desired output.
java.time
The Question and other Answers use old legacy classes that have proven to be troublesome and confusing. They have been supplanted by the java.time classes.
Your input string is in standard ISO 8601 format. These formats are used by default in java.time classes. So no need to specify a formatting pattern.
You can generate a String in your desired format.
MonthDay
You can generate a String in your desired format.
Источники информации:
- http://docs.oracle.com/javase/8/docs/api/java/time/format/DateTimeFormatter.html
- http://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/text/SimpleDateFormat.html
- http://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/time/format/DateTimeFormatter.html
- http://stackoverflow.com/questions/7631470/how-to-format-a-date-in-java