Java Data Format Error [closed]

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Any Clues on how to fix this:

SimpleDateFormat df = new SimpleDateFormat("yyyy/mm/dd hh:24mi:ss");

Exception:

Exception in thread "main" java.lang.IllegalArgumentException: Illegal pattern character 'i'
at java.text.SimpleDateFormat.compile(SimpleDateFormat.java:696)
at java.text.SimpleDateFormat.initialize(SimpleDateFormat.java:515)
at java.text.SimpleDateFormat.<init>(SimpleDateFormat.java:464)
at java.text.SimpleDateFormat.<init>(SimpleDateFormat.java:445)
at CopyEJ.CopyEJ.main(CopyEJ.java:105)

what are you trying to do? what do you expect 'i' format character to do? — MK.
– MK., Commented Jun 28, 2013 at 13:23
Your date pattern looks like Oracle database and not like Java... — Uwe Plonus
– Uwe Plonus, Commented Jun 28, 2013 at 13:26

Jan Dörrenhaus · Accepted Answer · 2013-06-28 13:25:18Z

7

Your pattern string is not following the java standard. This should work:

SimpleDateFormat df = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");

answered Jun 28, 2013 at 13:25

Jan Dörrenhaus

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AlexWien · Accepted Answer · 2013-06-28 15:38:50Z

5

Your date format pattern string contains the invalid sequence 24mi.

change to:

SimpleDateFormat("yyyy/MM/dd HH:mm:ss");

note: the Big letter "HH" means 24 hours: e.g 23:59:00
while "hh" is 12 hours format: 11:59:00

edited Jun 28, 2013 at 15:38

answered Jun 28, 2013 at 13:26

AlexWien

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mtk · Accepted Answer · 2013-06-28 13:39:14Z

As pointed by others, the pattern string is not correct, and can be as showed by others "yyyy/MM/dd HH:mm:ss".

Refer the java documentation for looking up the available pattern letters that could be used for formatting a date.

Snippet from the above link

Letter  Date or Time Component  Presentation    Examples
G   Era designator  Text    AD
y   Year    Year    1996; 96
M   Month in year   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 in week     Text    Tuesday; Tue
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

Ruchira Gayan Ranaweera · Accepted Answer · 2013-06-28 13:33:57Z

1

If you want hours in 24 hour format Use this

    DateFormat df=new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
    Date dd=new Date();
    System.out.println(df.format(dd));

answered Jun 28, 2013 at 13:33

Ruchira Gayan Ranaweera

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Basil Bourque · Accepted Answer · 2025-07-23 21:56:28Z

java.time

Updating for the java.time classes that supplanted the terribly-flawed legacy date-time classes SimpleDateFormat, Date, Calendar, etc.

Your formatting pattern was wrong on two counts:

Ignoring case-sensitivity (mm versus MM)
Invalid formatting codes (I)

The formatting codes is java.time are similar, but not exactly the same as the legacy classes. Be sure to study the Javadoc carefully.

DateTimeFormatter f = DateTimeFormatter.ofPattern ( "uuuu/MM/dd HH:mm:ss" ) ;

Capture the current moment.

ZoneId z = ZoneId.of ( "America/Edmonton" ) ;  // Or ZoneId.systemDefault()
ZonedDateTime zdt = ZonedDateTime.now ( z ) ;

Use that formatter to generate text.

String output = zdt.format ( f ) ;

See this code run at Ideone.com.

2025/07/23 15:55:24

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