convert Date to String with J2ME

[Molz]

Hi,
How can I convert a Date object into a String using J2ME?
Obviously toString() method doesn't works and there aren't classes
SimpleDateFormat and DateFormat.

Can yuo help me?

Thanks
Bye

 

[Erwin Moller]

Hi,
How can I convert a Date object into a String using J2ME?
Obviously toString() method doesn't works and there aren't classes
SimpleDateFormat and DateFormat.

according to the API toString() does work.

Are you sure you are not getting a nullpointerException??

 

[David Zimmerman]

Molz wrote:




according to the API toString() does work.

Are you sure you are not getting a nullpointerException??

Not all implementations use toString() to give a formatted version of
the date. Some just use the default Object.toString() which isn't
terriably useful.

OP: You'll have to do it by hand, IE format the day, month and year,
hour, minute and second and put them in a String as you need.

 

[joe zobkiw]

Hi,
How can I convert a Date object into a String using J2ME?
Obviously toString() method doesn't works and there aren't classes
SimpleDateFormat and DateFormat.

Can yuo help me?

Thanks
Bye

Date d = new Date();
System.out.println(d); // This works
System.out.println(d.toString()); // And this works

 

[Roedy Green]

How can I convert a Date object into a String using J2ME?
Obviously toString() method doesn't works and there aren't classes
SimpleDateFormat and DateFormat.

have at look at the toString method in BigDate. You can do it that
way.

http://mindprod.com/jgloss/bigdate.html

It is very little more work that using SimpleDateFormat

 

[David Zimmerman]

have at look at the toString method in BigDate. You can do it that
way.

Does BigDate work in J2ME?

 

[Roedy Green]

Does BigDate work in J2ME?

I would think it would. If not, you have the source so you could prune
out the conversion methods that use Date and Timezone.

You could also just see the technique. It is not rocket science to put
left zeros on numbers and string them together with punctuation.

 

[Molz]

Not all implementations use toString() to give a formatted version of

the date. Some just use the default Object.toString() which isn't
terriably useful.

In fact

OP: You'll have to do it by hand, IE format the day, month and year,
hour, minute and second and put them in a String as you need.

Yes but how I can do?

In J2ME there aren't methods getYear() getMonth() and getDate()

 

[Molz]

I would think it would. If not, you have the source so you could prune
out the conversion methods that use Date and Timezone.

You could also just see the technique. It is not rocket science to put
left zeros on numbers and string them together with punctuation.

Yes but BigDate haven't a constructor or an other method that takes a
Date object or a long (the # of milliseconds) as parameter to make a
BigDate object
Am I wrong?

 

[Molz]

Date d = new Date();
System.out.println(d); // This works
System.out.println(d.toString()); // And this works

Yes, they print

java.lang.object.Date@0

It is not really what I want.
They print the date only in java.sql.Date that rewrite method
toString(), but in J2ME there isn't this class

 

[David Zimmerman]

/**
* Create a string from the TimeOfDay portion of a time/date as
hh::mm::ss
* @param data The date/time as milliseconds since the epoch.
*/
public static String timeToString (long date)
{
Calendar c = Calendar.getInstance();
c.setTime(new Date(date));
int h = c.get(Calendar.HOUR_OF_DAY);
int m = c.get(Calendar.MINUTE);
int s = c.get(Calendar.SECOND);
String t = (h<10? "0": "")+h+":"+(m<10? "0": "")+m+":"+(s<10?
"0": "")+s;
return t;
}

/**
* Create a string from the date portion of a time/date as yyyy-mm-dd
* @param date the dat/time as milliseconds since the epoch
*/
public static String dateToString (long date)
{
Calendar c = Calendar.getInstance();
c.setTime(new Date(date));
int y = c.get(Calendar.YEAR);
int m = c.get(Calendar.MONTH) + 1;
int d = c.get(Calendar.DATE);
String t = (y<10? "0": "")+y+"-"+(m<10? "0": "")+m+"-"+(d<10?
"0": "")+d;
return t;
}

 

[David Zimmerman]

/**
* Create a string from the TimeOfDay portion of a time/date as
hh::mm::ss
* @param data The date/time as milliseconds since the epoch.
*/
public static String timeToString (long date)
{
Calendar c = Calendar.getInstance();
c.setTime(new Date(date));
int h = c.get(Calendar.HOUR_OF_DAY);
int m = c.get(Calendar.MINUTE);
int s = c.get(Calendar.SECOND);
String t = (h<10? "0": "")+h+":"+(m<10? "0": "")+m+":"+(s<10?
"0": "")+s;
return t;
}

/**
* Create a string from the date portion of a time/date as yyyy-mm-dd
* @param date the dat/time as milliseconds since the epoch
*/
public static String dateToString (long date)
{
Calendar c = Calendar.getInstance();
c.setTime(new Date(date));
int y = c.get(Calendar.YEAR);
int m = c.get(Calendar.MONTH) + 1;
int d = c.get(Calendar.DATE);
String t = (y<10? "0": "")+y+"-"+(m<10? "0": "")+m+"-"+(d<10?
"0": "")+d;
return t;
}

This ignores timezone issues, but that shouldn't be too hard to add

 

[Roedy Green]

Yes but how I can do?

In J2ME there aren't methods getYear() getMonth() and getDate()

What is your starting point?

Are you trying to get current time? Is there no System.timeInmillis?

Is there a Date class?

Sorry I have no idea what is missing in J2ME.

 

[Roedy Green]

Yes but BigDate haven't a constructor or an other method that takes a
Date object or a long (the # of milliseconds) as parameter to make a
BigDate object

It does now. There is a constructor that takes a Date and a TimeZone.

 

[Molz]

This ignores timezone issues, but that shouldn't be too hard to add

Thanks a lot.
Bye