Java time format yyyy mm dd

Format Date to yyyy-MM-dd in java

In this post, we will see how to Format Date to yyyy-MM-dd in java.

There are multiple ways to format Date to yyyy-MM-dd in java. Let’s go through them.

Using DateTimeFormatter with LocalDate (Java 8)

To Format Date to yyyy-MM-dd in java:

• Create a LocalDateTime object.
• Use DateTimeFormatter.ofPattern() to specify the pattern yyyy-MM-dd
• Call format() method on DateTimeFormatter and pass LocalDateTime object
• Get result in String with date format yyyy-mm-dd .

Let’s see with the help of example:

Using SimpleDateFormat

To Format Date to yyyy-MM-dd in java:

• Create Date object
• Create SimpleDateFormat with pattern yyyy-MM-dd
• Call format() method on SimpleDateFormat and pass Date object
• Get result in String with date format yyyy-mm-dd.

Further reading:

How to get day name from date in java

Format LocalDateTime to String in Java

Using Calendar class

To Format Date to yyyy-MM-dd in java:

• Use Calendar’s setTime() method to set current date
• Use calendar class to get day, month and year using Calendar.get() methods.
• Create format yyyy-MM-dd using String concatenation.

This is not a recommended approach as it does not specify format explicitly and is more error prone.

Let’s see with the help of example:

String yyyymmddFormat = ( year ) + «-» + ( ( month < 10 ) ? "0" + month : month ) + "-" + ( ( day < 10 ) ? "0" + day : day ) ;

Note that we have added 1 after getting month using calendar.get(Calendar.MONTH) because it returns month from 0 to 11. 0 denotes January and 11 denotes December.

That’s all about how to Format Date to yyyy-MM-dd in java.

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Class SimpleDateFormat

SimpleDateFormat is a concrete class for formatting and parsing dates in a locale-sensitive manner. It allows for formatting (date → text), parsing (text → date), and normalization.

SimpleDateFormat allows you to start by choosing any user-defined patterns for date-time formatting. However, you are encouraged to create a date-time formatter with either getTimeInstance , getDateInstance , or getDateTimeInstance in DateFormat . Each of these class methods can return a date/time formatter initialized with a default format pattern. You may modify the format pattern using the applyPattern methods as desired. For more information on using these methods, see DateFormat .

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):

Chart shows pattern letters, date/time component, presentation, and examples.

Letter	Date or Time Component	Presentation	Examples
G	Era designator	Text	AD
y	Year	Year	1996 ; 96
Y	Week year	Year	2009 ; 09
M	Month in year (context sensitive)	Month	July ; Jul ; 07
L	Month in year (standalone form)	Month	July ; Jul ; 07
w	Week in year	Number	27
W	Week in month	Number	2
D	Day in year	Number	189
d	Day in month	Number	10
F	Day of week in month	Number	2
E	Day name in week	Text	Tuesday ; Tue
u	Day number of week (1 = Monday, . 7 = Sunday)	Number	1
a	Am/pm marker	Text	PM
H	Hour in day (0-23)	Number	0
k	Hour in day (1-24)	Number	24
K	Hour in am/pm (0-11)	Number	0
h	Hour in am/pm (1-12)	Number	12
m	Minute in hour	Number	30
s	Second in minute	Number	55
S	Millisecond	Number	978
z	Time zone	General time zone	Pacific Standard Time ; PST ; GMT-08:00
Z	Time zone	RFC 822 time zone	-0800
X	Time zone	ISO 8601 time zone	-08 ; -0800 ; -08:00

• Text: For formatting, 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. For parsing, both forms are accepted, independent of the number of pattern letters.

• For formatting, if the number of pattern letters is 2, the year is truncated to 2 digits; otherwise it is interpreted as a number.
• For parsing, if the number of pattern letters is more than 2, the year is interpreted literally, regardless of the number of digits. So using the pattern «MM/dd/yyyy», «01/11/12» parses to Jan 11, 12 A.D.
• For parsing with the abbreviated year pattern («y» or «yy»), SimpleDateFormat must interpret the abbreviated year relative to some century. It does this by adjusting dates to be within 80 years before and 20 years after the time the SimpleDateFormat instance is created. For example, using a pattern of «MM/dd/yy» and a SimpleDateFormat instance created on Jan 1, 1997, the string «01/11/12» would be interpreted as Jan 11, 2012 while the string «05/04/64» would be interpreted as May 4, 1964. During parsing, only strings consisting of exactly two digits, as defined by Character.isDigit(char) , will be parsed into the default century. Any other numeric string, such as a one digit string, a three or more digit string, or a two digit string that isn’t all digits (for example, «-1»), is interpreted literally. So «01/02/3» or «01/02/003» are parsed, using the same pattern, as Jan 2, 3 AD. Likewise, «01/02/-3» is parsed as Jan 2, 4 BC.

If week year ‘Y’ is specified and the calendar doesn’t support any week years, the calendar year ( ‘y’ ) is used instead. The support of week years can be tested with a call to getCalendar() . isWeekDateSupported() .

• Letter M produces context-sensitive month names, such as the embedded form of names. Letter M is context-sensitive in the sense that when it is used in the standalone pattern, for example, «MMMM», it gives the standalone form of a month name and when it is used in the pattern containing other field(s), for example, «d MMMM», it gives the format form of a month name. For example, January in the Catalan language is «de gener» in the format form while it is «gener» in the standalone form. In this case, «MMMM» will produce «gener» and the month part of the «d MMMM» will produce «de gener». If a DateFormatSymbols has been set explicitly with constructor SimpleDateFormat(String,DateFormatSymbols) or method setDateFormatSymbols(DateFormatSymbols) , the month names given by the DateFormatSymbols are used.
• Letter L produces the standalone form of month names.

GMTOffsetTimeZone: GMT Sign Hours : Minutes Sign: one of + - Hours: Digit Digit Digit Minutes: Digit Digit Digit: one of 0 1 2 3 4 5 6 7 8 9

Hours must be between 0 and 23, and Minutes must be between 00 and 59. The format is locale independent and digits must be taken from the Basic Latin block of the Unicode standard. For parsing, RFC 822 time zones are also accepted.

RFC822TimeZone: Sign TwoDigitHours Minutes TwoDigitHours: Digit Digit

ISO8601TimeZone: OneLetterISO8601TimeZone TwoLetterISO8601TimeZone ThreeLetterISO8601TimeZone OneLetterISO8601TimeZone: Sign TwoDigitHours Z TwoLetterISO8601TimeZone: Sign TwoDigitHours Minutes Z ThreeLetterISO8601TimeZone: Sign TwoDigitHours : Minutes Z

Examples

The following examples show how date and time patterns are interpreted in the U.S. locale. The given date and time are 2001-07-04 12:08:56 local time in the U.S. Pacific Time time zone.

Examples of date and time patterns interpreted in the U.S. locale

Date and Time Pattern	Result
«yyyy.MM.dd G ‘at’ HH:mm:ss z»	2001.07.04 AD at 12:08:56 PDT
«EEE, MMM d, »yy»	Wed, Jul 4, ’01
«h:mm a»	12:08 PM
«hh ‘o»clock’ a, zzzz»	12 o’clock PM, Pacific Daylight Time
«K:mm a, z»	0:08 PM, PDT
«yyyyy.MMMMM.dd GGG hh:mm aaa»	02001.July.04 AD 12:08 PM
«EEE, d MMM yyyy HH:mm:ss Z»	Wed, 4 Jul 2001 12:08:56 -0700
«yyMMddHHmmssZ»	010704120856-0700
«yyyy-MM-dd’T’HH:mm:ss.SSSZ»	2001-07-04T12:08:56.235-0700
«yyyy-MM-dd’T’HH:mm:ss.SSSXXX»	2001-07-04T12:08:56.235-07:00
«YYYY-‘W’ww-u»	2001-W27-3

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.

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