jdk.text.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):
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
Pattern letters are usually repeated, as their number determines the exact presentation:
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. Number: For formatting, the number of pattern letters is the minimum number of digits, and shorter numbers are zero-padded to this amount. For parsing, the number of pattern letters is ignored unless it's needed to separate two adjacent fields. Year: If the formatter's Calendar is the Gregorian calendar, the following rules are applied.
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.
Otherwise, calendar system specific forms are applied.
For both formatting and parsing, if the number of pattern
letters is 4 or more, a calendar specific long form is used. Otherwise, a calendar
specific short or abbreviated form
is used.
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().
Month: If the number of pattern letters is 3 or more, the month is interpreted as text; otherwise, it is interpreted as a number.
Letter M produces context-sensitive month names, such as the
embedded form of names. 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.
General time zone: Time zones are interpreted as text if they have names. For time zones representing a GMT offset value, the following syntax is used:
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.
RFC 822 time zone: For formatting, the RFC 822 4-digit time zone format is used:
RFC822TimeZone:
Sign TwoDigitHours Minutes
TwoDigitHours:
Digit Digit
TwoDigitHours must be between 00 and 23. Other definitions
are as for general time zones.
For parsing, general time zones are also
accepted.
ISO 8601 Time zone: The number of pattern letters designates the format for both formatting and parsing as follows:
ISO8601TimeZone:
OneLetterISO8601TimeZone
TwoLetterISO8601TimeZone
ThreeLetterISO8601TimeZone
OneLetterISO8601TimeZone:
Sign TwoDigitHours
Z
TwoLetterISO8601TimeZone:
Sign TwoDigitHours Minutes
Z
ThreeLetterISO8601TimeZone:
Sign TwoDigitHours : Minutes
Z
Other definitions are as for general time zones or
RFC 822 time zones.
For formatting, if the offset value from GMT is 0, "Z" is
produced. If the number of pattern letters is 1, any fraction of an hour
is ignored. For example, if the pattern is "X" and the time zone is
"GMT+05:30", "+05" is produced.
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
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.
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.
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):
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
Pattern letters are usually repeated, as their number determines the
exact presentation:
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.
Number:
For formatting, the number of pattern letters is the minimum
number of digits, and shorter numbers are zero-padded to this amount.
For parsing, the number of pattern letters is ignored unless
it's needed to separate two adjacent fields.
Year:
If the formatter's Calendar is the Gregorian
calendar, the following rules are applied.
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.
Otherwise, calendar system specific forms are applied.
For both formatting and parsing, if the number of pattern
letters is 4 or more, a calendar specific long form is used. Otherwise, a calendar
specific short or abbreviated form
is used.
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().
Month:
If the number of pattern letters is 3 or more, the month is
interpreted as text; otherwise,
it is interpreted as a number.
Letter M produces context-sensitive month names, such as the
embedded form of names. 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.
General time zone:
Time zones are interpreted as text if they have
names. For time zones representing a GMT offset value, the
following syntax is used:
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.
RFC 822 time zone:
For formatting, the RFC 822 4-digit time zone format is used:
RFC822TimeZone:
Sign TwoDigitHours Minutes
TwoDigitHours:
Digit Digit
TwoDigitHours must be between 00 and 23. Other definitions
are as for general time zones.
For parsing, general time zones are also
accepted.
ISO 8601 Time zone:
The number of pattern letters designates the format for both formatting
and parsing as follows:
ISO8601TimeZone:
OneLetterISO8601TimeZone
TwoLetterISO8601TimeZone
ThreeLetterISO8601TimeZone
OneLetterISO8601TimeZone:
Sign TwoDigitHours
Z
TwoLetterISO8601TimeZone:
Sign TwoDigitHours Minutes
Z
ThreeLetterISO8601TimeZone:
Sign TwoDigitHours : Minutes
Z
Other definitions are as for general time zones or
RFC 822 time zones.
For formatting, if the offset value from GMT is 0, "Z" is
produced. If the number of pattern letters is 1, any fraction of an hour
is ignored. For example, if the pattern is "X" and the time zone is
"GMT+05:30", "+05" is produced.
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
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.
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.->simple-date-formatclj
(->simple-date-format)(->simple-date-format pattern)(->simple-date-format pattern locale)Constructor.
Constructs a SimpleDateFormat using the given pattern and the default date format symbols for the given locale. Note: This constructor may not support all locales. For full coverage, use the factory methods in the DateFormat class.
pattern - the pattern describing the date and time format - java.lang.String
locale - the locale whose date format symbols should be used - java.util.Locale
throws: java.lang.NullPointerException - if the given pattern or locale is null
Constructor. Constructs a SimpleDateFormat using the given pattern and the default date format symbols for the given locale. Note: This constructor may not support all locales. For full coverage, use the factory methods in the DateFormat class. pattern - the pattern describing the date and time format - `java.lang.String` locale - the locale whose date format symbols should be used - `java.util.Locale` throws: java.lang.NullPointerException - if the given pattern or locale is null
apply-localized-patternclj
(apply-localized-pattern this pattern)Applies the given localized pattern string to this date format.
pattern - a String to be mapped to the new date and time format pattern for this format - java.lang.String
throws: java.lang.NullPointerException - if the given pattern is null
Applies the given localized pattern string to this date format. pattern - a String to be mapped to the new date and time format pattern for this format - `java.lang.String` throws: java.lang.NullPointerException - if the given pattern is null
apply-patternclj
(apply-pattern this pattern)Applies the given pattern string to this date format.
pattern - the new date and time pattern for this date format - java.lang.String
throws: java.lang.NullPointerException - if the given pattern is null
Applies the given pattern string to this date format. pattern - the new date and time pattern for this date format - `java.lang.String` throws: java.lang.NullPointerException - if the given pattern is null
cloneclj
(clone this)Creates a copy of this SimpleDateFormat. This also clones the format's date format symbols.
returns: a clone of this SimpleDateFormat - java.lang.Object
Creates a copy of this SimpleDateFormat. This also clones the format's date format symbols. returns: a clone of this SimpleDateFormat - `java.lang.Object`
equalsclj
(equals this obj)Compares the given object with this SimpleDateFormat for equality.
obj - the reference object with which to compare. - java.lang.Object
returns: true if the given object is equal to this
SimpleDateFormat - boolean
Compares the given object with this SimpleDateFormat for equality. obj - the reference object with which to compare. - `java.lang.Object` returns: true if the given object is equal to this SimpleDateFormat - `boolean`
formatclj
(format this date to-append-to pos)Formats the given Date into a date/time string and appends the result to the given StringBuffer.
date - the date-time value to be formatted into a date-time string. - java.util.Date
to-append-to - where the new date-time text is to be appended. - java.lang.StringBuffer
pos - the formatting position. On input: an alignment field, if desired. On output: the offsets of the alignment field. - java.text.FieldPosition
returns: the formatted date-time string. - java.lang.StringBuffer
throws: java.lang.NullPointerException - if the given date is null.
Formats the given Date into a date/time string and appends the result to the given StringBuffer. date - the date-time value to be formatted into a date-time string. - `java.util.Date` to-append-to - where the new date-time text is to be appended. - `java.lang.StringBuffer` pos - the formatting position. On input: an alignment field, if desired. On output: the offsets of the alignment field. - `java.text.FieldPosition` returns: the formatted date-time string. - `java.lang.StringBuffer` throws: java.lang.NullPointerException - if the given date is null.
format-to-character-iteratorclj
(format-to-character-iterator this obj)Formats an Object producing an AttributedCharacterIterator. You can use the returned AttributedCharacterIterator to build the resulting String, as well as to determine information about the resulting String.
Each attribute key of the AttributedCharacterIterator will be of type DateFormat.Field, with the corresponding attribute value being the same as the attribute key.
obj - The object to format - java.lang.Object
returns: AttributedCharacterIterator describing the formatted value. - java.text.AttributedCharacterIterator
throws: java.lang.NullPointerException - if obj is null.
Formats an Object producing an AttributedCharacterIterator. You can use the returned AttributedCharacterIterator to build the resulting String, as well as to determine information about the resulting String. Each attribute key of the AttributedCharacterIterator will be of type DateFormat.Field, with the corresponding attribute value being the same as the attribute key. obj - The object to format - `java.lang.Object` returns: AttributedCharacterIterator describing the formatted value. - `java.text.AttributedCharacterIterator` throws: java.lang.NullPointerException - if obj is null.
get-2-digit-year-startclj
(get-2-digit-year-start this)Returns the beginning date of the 100-year period 2-digit years are interpreted as being within.
returns: the start of the 100-year period into which two digit years are
parsed - java.util.Date
Returns the beginning date of the 100-year period 2-digit years are interpreted as being within. returns: the start of the 100-year period into which two digit years are parsed - `java.util.Date`
get-date-format-symbolsclj
(get-date-format-symbols this)Gets a copy of the date and time format symbols of this date format.
returns: the date and time format symbols of this date format - java.text.DateFormatSymbols
Gets a copy of the date and time format symbols of this date format. returns: the date and time format symbols of this date format - `java.text.DateFormatSymbols`
hash-codeclj
(hash-code this)Returns the hash code value for this SimpleDateFormat object.
returns: the hash code value for this SimpleDateFormat object. - int
Returns the hash code value for this SimpleDateFormat object. returns: the hash code value for this SimpleDateFormat object. - `int`
parseclj
(parse this text pos)Parses text from a string to produce a Date.
The method attempts to parse text starting at the index given by pos. If parsing succeeds, then the index of pos is updated to the index after the last character used (parsing does not necessarily use all characters up to the end of the string), and the parsed date is returned. The updated pos can be used to indicate the starting point for the next call to this method. If an error occurs, then the index of pos is not changed, the error index of pos is set to the index of the character where the error occurred, and null is returned.
This parsing operation uses the calendar to produce a Date. All of the calendar's date-time fields are cleared before parsing, and the calendar's default values of the date-time fields are used for any missing date-time information. For example, the year value of the parsed Date is 1970 with GregorianCalendar if no year value is given from the parsing operation. The TimeZone value may be overwritten, depending on the given pattern and the time zone value in text. Any TimeZone value that has previously been set by a call to setTimeZone may need to be restored for further operations.
text - A String, part of which should be parsed. - java.lang.String
pos - A ParsePosition object with index and error index information as described above. - java.text.ParsePosition
returns: A Date parsed from the string. In case of
error, returns null. - java.util.Date
throws: java.lang.NullPointerException - if text or pos is null.
Parses text from a string to produce a Date.
The method attempts to parse text starting at the index given by
pos.
If parsing succeeds, then the index of pos is updated
to the index after the last character used (parsing does not necessarily
use all characters up to the end of the string), and the parsed
date is returned. The updated pos can be used to
indicate the starting point for the next call to this method.
If an error occurs, then the index of pos is not
changed, the error index of pos is set to the index of
the character where the error occurred, and null is returned.
This parsing operation uses the calendar to produce a Date. All of the calendar's date-time fields are cleared before parsing, and the calendar's default
values of the date-time fields are used for any missing
date-time information. For example, the year value of the
parsed Date is 1970 with GregorianCalendar if
no year value is given from the parsing operation. The TimeZone value may be overwritten, depending on the given
pattern and the time zone value in text. Any TimeZone value that has previously been set by a call to
setTimeZone may need
to be restored for further operations.
text - A String, part of which should be parsed. - `java.lang.String`
pos - A ParsePosition object with index and error index information as described above. - `java.text.ParsePosition`
returns: A Date parsed from the string. In case of
error, returns null. - `java.util.Date`
throws: java.lang.NullPointerException - if text or pos is null.set-2-digit-year-startclj
(set-2-digit-year-start this start-date)Sets the 100-year period 2-digit years will be interpreted as being in to begin on the date the user specifies.
start-date - During parsing, two digit years will be placed in the range startDate to startDate 100 years. - java.util.Date
Sets the 100-year period 2-digit years will be interpreted as being in to begin on the date the user specifies. start-date - During parsing, two digit years will be placed in the range startDate to startDate 100 years. - `java.util.Date`
set-date-format-symbolsclj
(set-date-format-symbols this new-format-symbols)Sets the date and time format symbols of this date format.
new-format-symbols - the new date and time format symbols - java.text.DateFormatSymbols
throws: java.lang.NullPointerException - if the given newFormatSymbols is null
Sets the date and time format symbols of this date format. new-format-symbols - the new date and time format symbols - `java.text.DateFormatSymbols` throws: java.lang.NullPointerException - if the given newFormatSymbols is null
to-localized-patternclj
(to-localized-pattern this)Returns a localized pattern string describing this date format.
returns: a localized pattern string describing this date format. - java.lang.String
Returns a localized pattern string describing this date format. returns: a localized pattern string describing this date format. - `java.lang.String`
to-patternclj
(to-pattern this)Returns a pattern string describing this date format.
returns: a pattern string describing this date format. - java.lang.String
Returns a pattern string describing this date format. returns: a pattern string describing this date format. - `java.lang.String`
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