Parsing String to Date without using SimpleDateFormat?

Question

I am developing a spring application and in one of my controller i have following lines to parse from string to date and format the parsed date to required format. But again i need to parse back formatted string into date without using any SimpleDateFormat, so is it possible to do so ?

SimpleDateFormat dateFormat = new SimpleDateFormat("MM-dd-yyyy");
SimpleDateFormat dateFormat2 = new SimpleDateFormat("yyyy-MM-dd");

Date pick=dateFormat.parse(request.getParameter("pickDate"));
String pick_date=dateFormat2.format(pick);

You should avoid using SimpleDataFormat, because It's not thread-safe. — OQJF, Mar 26 '13 at 04:54
then you can have a local date format object, instead of sharing one across threads — Arun P Johny, Mar 26 '13 at 04:56
@AbhinavSarkar, there is no problem with it. But just I need to know how that can be done without using any Date Formatters that's it. — Kishan_KP, Mar 26 '13 at 05:00
Well then you shall reimplement something like it (maybe with fixed patterns) yourself. — Amir Pashazadeh, Mar 26 '13 at 05:08

Pragnani · Accepted Answer · 2013-03-26T05:19:31.913

5

Edit:

I found in the wikipedia that china has the locale yyyy-MM-dd. check this reference date format by country set locale to China you'll get the required date format

Try this

String d1="12-27-2010";
    Stirng[] splitdata=d1.split("-");

   int month=Integer.parseInt(splitdata[0]);
 int day=Integer.parseInt(splitdata[1]);
int year=Integer.parseInt(splitdata[2]);

Calender cal=Calender.getInstance(Locale.CHINA);
cal.set(year,month,day);
Date d=cal.getTime();

This should work

If you know your data format you can do that. by using simple string operations

Ex: if your data format is

MM-dd-yyyy

then you can convert to yyyy-MM-dd like this

String d1="12-27-2010";
Stirng[] splitdata=d1.split("-");

String s2= splitdate[2]+"-"+splitdate[0]+"-"+splitdate[1];

edited Mar 26 '13 at 05:19

answered Mar 26 '13 at 04:59

Pragnani

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But how you will parse it back to Date?. 's2' in your example is just string not Date object. – Kishan_KP Mar 26 '13 at 05:04
@WannabeGeek Sorry for the late reply and also wrong answer. I will get back to you in a min – Pragnani Mar 26 '13 at 05:13
I appreciate your effort, thanks for the answer. I will try your answer and get back to you. – Kishan_KP Mar 26 '13 at 05:19

score 0 · Answer 2 · answered Mar 26 '13 at 04:52

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You can use Concatenation Operator(+) for that

answered Mar 26 '13 at 04:52

Abdul Manaf

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score -2 · Answer 3 · answered Mar 26 '13 at 04:46

-2

Yes possible; just write the code to do the parsing. Should not be that difficult ...

answered Mar 26 '13 at 04:46

Amit

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how to do it without using SimpleDateFormat? – Kishan_KP Mar 26 '13 at 04:50
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just like how you program any other stuff. Pick up the string, break it up, 'read' the string, make a date out of it. I mean if you are NOT to use the inbuilt libraries of the language, you got to implement it yourself. Whoever wrote SimpleDateFormat did write the parsing code. You can write something similar. And a web search should yield you sample code as well. But it is most of the time a futile exercise .... difficult to get it right. What exactly is the problem with SimpleDateFormat ? – Amit Mar 26 '13 at 04:53

Parsing String to Date without using SimpleDateFormat?

3 Answers3