Calendar Problem
3 Message(s) by 3 Author(s) originally posted in java developer
| From: Me |
Date: Wednesday, September 01, 2004
|
How do I get the actual Calendar time out of a Calendar
object ?
I am trying to save
UTC time to a
table column. However the Calendar
object always returns the
current time, not the UTC time from its
utility
method s. The get() method does return the actual Calendar time.
----------------
Calendar cal = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
String actual = "";
actual += cal.get(Calendar.YEAR );
actual += "-";
actual += (cal.get(Calendar.MONTH ) + 1);
actual += "-";
actual += cal.get(Calendar.DAY_OF_MONTH );
actual += " ";
actual += cal.get(Calendar.HOUR_OF_DAY );
actual += ":";
actual += cal.get(Calendar.MINUTE );
actual += ":";
actual += cal.get(Calendar.SECOND );
actual += ".";
actual += cal.get(Calendar.MILLISECOND );
JAVA.sql.Timestamp ts = new JAVA.sql.Timestamp(cal.getTimeInMillis());
System.out.println( actual ); // this is right
System.out.println( ts.toString() ); // this is wrong
------------------
The above will alwys print the UTC time, then the current time, yet they
should be the same.
| From: stevebosman |
Date: Thursday, September 09, 2004
|
wrote in
message How do I get the actual Calendar time out of a Calendar object?
I am trying to save UTC time to a table column. However the Calendar
object always returns the current time, not the UTC time from its
utility methods. The get() method does return the actual Calendar time.
----------------
Calendar cal = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
String actual = "";
actual += cal.get(Calendar.YEAR );
actual += "-";
actual += (cal.get(Calendar.MONTH ) + 1);
actual += "-";
actual += cal.get(Calendar.DAY_OF_MONTH );
actual += " ";
actual += cal.get(Calendar.HOUR_OF_DAY );
actual += ":";
actual += cal.get(Calendar.MINUTE );
actual += ":";
actual += cal.get(Calendar.SECOND );
actual += ".";
actual += cal.get(Calendar.MILLISECOND );
JAVA.sql.Timestamp ts = new JAVA.sql.Timestamp(cal.getTimeInMillis());
System.out.println( actual ); // this is right
System.out.println( ts.toString() ); // this is wrong
------------------
The above will alwys print the UTC time, then the current time, yet they
should be the same.
No, they should not be the same. How does the Timestamp object know you
want a
string formatted in UTC? In fact internally Timestamp uses
TimeZone.getDefault() to determine the timezone it'll print for. You
should _never_ rely on toString() to give you anything useful. Try the
following:
DateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS");
df.setTimeZone(TimeZone.getTimeZone("UTC"));
System.out.println( df.format(ts));
HTH
Steve
| From: Wojtek Bok |
Date: Wednesday, September 22, 2004
|
wrote in message:
wrote in message
How do I get the actual Calendar time out of a Calendar object?
I am trying to save UTC time to a table column. However the Calendar
object always returns the current time, not the UTC time from its
utility methods. The get() method does return the actual Calendar time.
----------------
Calendar cal = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
String actual = "";
actual += cal.get(Calendar.YEAR );
actual += "-";
actual += (cal.get(Calendar.MONTH ) + 1);
actual += "-";
actual += cal.get(Calendar.DAY_OF_MONTH );
actual += " ";
actual += cal.get(Calendar.HOUR_OF_DAY );
actual += ":";
actual += cal.get(Calendar.MINUTE );
actual += ":";
actual += cal.get(Calendar.SECOND );
actual += ".";
actual += cal.get(Calendar.MILLISECOND );
JAVA.sql.Timestamp ts = new JAVA.sql.Timestamp(cal.getTimeInMillis());
System.out.println( actual ); // this is right
System.out.println( ts.toString() ); // this is wrong
------------------
The above will alwys print the UTC time, then the current time, yet they
should be the same.
No, they should not be the same. How does the Timestamp object know you
want a string formatted in UTC? In fact internally Timestamp uses
TimeZone.getDefault() to determine the timezone it'll print for. You
should _never_ rely on toString() to give you anything useful. Try the
following:
DateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS");
df.setTimeZone(TimeZone.getTimeZone("UTC"));
System.out.println( df.format(ts));
It isn't the format. I could care less about the format. The problem is
that obtaining the
date from Calendar, either via toString() or getting
a Date object, always gets the current
machine date, rather than the
stored date. the example shows that retrieving the values one by one
gets the right values, whereas the convienience methods don't. All from
the same object.
I assumed that because I set the Timezone in the Calendar object, that I
would ALWAYS get that value from it. This isn't the case.
You only get the right values by retrieving them individually.
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