Date format Conversion

[John Smith]

I need to convert "20050930" to "9/30/2005 12:00:00.000 AM" using Java
Strings and (perhaps?) regular expressions.

The idea is to match 2005 as the year, and put it under the [yyyy] part
of mm/dd/yyyy, then match the next 2 digits of mm, then the next 2
digits of dd, etc. I need to scan the "20050930" string 1 character at
a time.

Should I use regular expressions? Or is there a simpler method?

Examples will also be appreciated.

 

[Paul Hamaker]

Simpler method ? Yes,
http://javalessons.com/cgi-bin/ui/java-swing.cgi?1cd=dte&sid=ao789
line 22

 

[camiller]

Here is an example I had handy where I am parsing out a date in the
format MM/DD/YYYY to get the parts. You should be able to adapt it to
your use. dateField, day, month, and year are Strings:

day = dateField.substring(3,5);
month = dateField.substring(0,2);
year = dateField.substring(6,10);

 

[IchBin]

I need to convert "20050930" to "9/30/2005 12:00:00.000 AM" using Java
Strings and (perhaps?) regular expressions.

The idea is to match 2005 as the year, and put it under the [yyyy] part
of mm/dd/yyyy, then match the next 2 digits of mm, then the next 2
digits of dd, etc. I need to scan the "20050930" string 1 character at
a time.

Should I use regular expressions? Or is there a simpler method?

Examples will also be appreciated.

How about something like this:

Format formatter = new SimpleDateFormat("MM/dd/yyyy HH:mm:ss.SSS aaa");
String var = "20050930";
String formattedDate = formatter.format(
new Date(var.substring(4,6)
+"/"+var.substring(6,8)
+"/"+var.substring(0,4)));
--

Thanks in Advance...
IchBin, Pocono Lake, Pa, USA
http://weconsultants.servebeer.com/JHackerAppManager
__________________________________________________________________________

'If there is one, Knowledge is the "Fountain of Youth"'
-William E. Taylor, Regular Guy (1952-)

 

[Roedy Green]

The idea is to match 2005 as the year, and put it under the [yyyy] part
of mm/dd/yyyy, then match the next 2 digits of mm, then the next 2
digits of dd, etc. I need to scan the "20050930" string 1 character at
a time.

Hava a look at SimpleDateFormat.parse

Those jobs I am lazy and tend do the code with character handling
rather than try to decode somebody's documentation on how to use their
more complex tool.

It may or may not handle variable width fields. Let us know what you
find out.

 

[tom fredriksen]

Here is an example I had handy where I am parsing out a date in the
format MM/DD/YYYY to get the parts. You should be able to adapt it to
your use. dateField, day, month, and year are Strings:

day = dateField.substring(3,5);
month = dateField.substring(0,2);
year = dateField.substring(6,10);

That only works if you know the string to be of the exact format, if its
not then you have problems. so you need to add some code to verify the
data before it can be accepted. This code is already invented in f.ex in

SimpleDateFormat

/tom