Java Calendar problem

Question

Hello
I have problems with Java Calendar class:
Problem 1:
I try to set Java calendar to specific date, but an exception is thrown. Problematic dates are 19210501 and 19420403 (yyyymmdd) at midnight (hour of day = 0, minutes = 0, seconds = 0, milliseconds = 0). Setting other dates between 15000101 and 22000101 work OK. Exception is thrown when calendar calculates new values. Note that exception is NOT thrown if I do not set hour / minute / second fields!
Problem 2:
I set Java calendar to specific date A and convert that date to timeInMillis. Then I set this timeInMillis to calendar and convert it to date B. For certain dates A != B. Problematic dates are 19210501 and 19420403 (yyyymmdd) at midnight (hour of day = 0, minutes = 0, seconds = 0, milliseconds = 0). Setting other dates between 15000101 and 22000101 work OK.
These problems occur if timeZone = "Europe/Helsinki". Problem does not occur if timeZone = "EET" or "GMT".
Example code of this problem is below:
==================
package z_javaexperiments5;
import java.util.Calendar;
import java.util.TimeZone;
public class CalendarProblem {
public static void main(String[] args) {
CalendarProblem main = new CalendarProblem();
System.out.println( "RunSetCalendars" );
TimeZone timeZone = TimeZone.getTimeZone( "GMT" );
main.runSetCalendars( timeZone, 19420403000000000L );
main.runSetCalendars( timeZone, 19210501000000000L );
main.runSetCalendars( timeZone, 19210502000000000L );
timeZone = TimeZone.getTimeZone( "EET" );
main.runSetCalendars( timeZone, 19420403000000000L );
main.runSetCalendars( timeZone, 19210501000000000L );
main.runSetCalendars( timeZone, 19210502000000000L );
timeZone = TimeZone.getTimeZone( "Europe/Helsinki" );
main.runSetCalendars( timeZone, 19420403000000000L );
main.runSetCalendars( timeZone, 19210501000000000L );
main.runSetCalendars( timeZone, 19210502000000000L );
Calendar setCalendar1( TimeZone timeZone, long dateTimeYYYYMMDDHHMMSSsss ) {
Calendar calendar = Calendar.getInstance(timeZone);
calendar.clear();
System.out.println( "setCalendar1 timeZone = " + calendar.getTimeZone().getID());
int year = (int)( dateTimeYYYYMMDDHHMMSSsss / 10000000000000L );
int month = (int)(( dateTimeYYYYMMDDHHMMSSsss % 10000000000000L ) / 100000000000L ) - 1;
int day = (int)(( dateTimeYYYYMMDDHHMMSSsss % 100000000000L ) / 1000000000 );
int hour = (int)(( dateTimeYYYYMMDDHHMMSSsss % 1000000000 ) / 10000000 );
int min = (int)(( dateTimeYYYYMMDDHHMMSSsss % 10000000 ) / 100000 );
int sec = (int)(( dateTimeYYYYMMDDHHMMSSsss % 100000 ) / 1000 );
int mSec = (int)( dateTimeYYYYMMDDHHMMSSsss % 1000 );
System.out.println( year + "." + (month+1) + "." + day + " " + hour + ":" + min + ":" + sec + "." + mSec );
calendar.set( year, month, day );
calendar.set( Calendar.HOUR_OF_DAY, hour );
calendar.set( Calendar.MINUTE, min );
calendar.set( Calendar.SECOND, sec );
calendar.set( Calendar.MILLISECOND, mSec );
calendar.setLenient( false ); // Reject illegal values
try {
calendar.get( Calendar.SECOND ); // Recalc values
} catch ( IllegalArgumentException e ) {
throw new RuntimeException("Invalid argument: Cannot convert long to dateTimeYYYYMMDDHHMMSSsss, long = " + dateTimeYYYYMMDDHHMMSSsss + " Exception message = " + e.getMessage());
return calendar;
Calendar setCalendar2( TimeZone timeZone, long dateTimeYYYYMMDDHHMMSSsss ) {
Calendar calendar = Calendar.getInstance(timeZone);
System.out.println( "setCalendar2 timeZone = " + calendar.getTimeZone().getID());
calendar.clear();
int year = (int)( dateTimeYYYYMMDDHHMMSSsss / 10000000000000L );
int month = (int)(( dateTimeYYYYMMDDHHMMSSsss % 10000000000000L ) / 100000000000L ) - 1;
int day = (int)(( dateTimeYYYYMMDDHHMMSSsss % 100000000000L ) / 1000000000 );
int hour = (int)(( dateTimeYYYYMMDDHHMMSSsss % 1000000000 ) / 10000000 );
int min = (int)(( dateTimeYYYYMMDDHHMMSSsss % 10000000 ) / 100000 );
int sec = (int)(( dateTimeYYYYMMDDHHMMSSsss % 100000 ) / 1000 );
int mSec = (int)( dateTimeYYYYMMDDHHMMSSsss % 1000 );
System.out.println( "Initial dateTime = " + year + "." + (month+1) + "." + day + " " + hour + ":" + min + ":" + sec + "." + mSec );
calendar.set( year, month, day );
if ( hour != 0 )
calendar.set( Calendar.HOUR_OF_DAY, hour );
else
calendar.clear( Calendar.HOUR_OF_DAY );
if ( min != 0 )
calendar.set( Calendar.MINUTE, min );
else
calendar.clear( Calendar.MINUTE );
if ( sec != 0 )
calendar.set( Calendar.SECOND, sec );
else
calendar.clear( Calendar.SECOND );
if ( mSec != 0 )
calendar.set( Calendar.MILLISECOND, mSec );
else
calendar.clear( Calendar.MILLISECOND );
calendar.setLenient( false ); // Reject illegal values
try {
calendar.get( Calendar.SECOND ); // Recalc values
} catch ( IllegalArgumentException e ) {
throw new RuntimeException("Invalid argument: Cannot convert long to dateTimeYYYYMMDDHHMMSSsss, long = " + dateTimeYYYYMMDDHHMMSSsss + " Exception message = " + e.getMessage());
long millis = calendar.getTimeInMillis();
//System.out.println( "Initial dateTime = " + millis );
calendar = Calendar.getInstance(timeZone);
calendar.clear();
calendar.setTimeInMillis( millis );
int year2 = calendar.get( Calendar.YEAR );
int month2 = calendar.get( Calendar.MONTH );
int day2 = calendar.get( Calendar.DAY_OF_MONTH );
int hour2 = calendar.get( Calendar.HOUR_OF_DAY );
int min2 = calendar.get( Calendar.MINUTE );
int sec2 = calendar.get( Calendar.SECOND );
int mSec2 = calendar.get( Calendar.MILLISECOND );
System.out.println( "Final dateTime = " + year2 + "." + (month2+1) + "." + day2 + " " + hour2 + ":" + min2 + ":" + sec2 + "." + mSec2 );
if (( year != year2 ) || ( month != month2 ) || ( day != day2 ) || ( hour != hour2 ) || ( min != min2 ) || ( sec != sec2 ) || ( mSec != mSec2 ))
System.out.println( "setCalendar2 failed, dates are not equal" );
return calendar;
void runSetCalendars( TimeZone timeZone, long dateTimeYYYYMMDDHHMMSSsss ) {
System.out.println( "" );
System.out.println( "runSetCalendars dateTimeYYYYMMDDHHMMSSsss = " + dateTimeYYYYMMDDHHMMSSsss );
try {
setCalendar1( timeZone, dateTimeYYYYMMDDHHMMSSsss );
} catch ( RuntimeException e ) {
System.out.println( "setCalendar1 failed, dateTimeYYYYMMDDHHMMSSsss = " + dateTimeYYYYMMDDHHMMSSsss + " Exception = " + e.toString());
Calendar calendar = null;
try {
calendar = setCalendar2( timeZone, dateTimeYYYYMMDDHHMMSSsss );
long timeInMillis = calendar.getTimeInMillis();
calendar.clear();
calendar.setTimeInMillis( timeInMillis );
} catch ( RuntimeException e ) {
System.out.println( "setCalendar2 failed, dateTimeYYYYMMDDHHMMSSsss = " + dateTimeYYYYMMDDHHMMSSsss + " Exception = " + e.toString());
==================
Program output is below:
==================
RunSetCalendars
runSetCalendars dateTimeYYYYMMDDHHMMSSsss = 19420403000000000
setCalendar1 timeZone = GMT
1942.4.3 0:0:0.0
setCalendar2 timeZone = GMT
Initial dateTime = 1942.4.3 0:0:0.0
Final dateTime = 1942.4.3 0:0:0.0
runSetCalendars dateTimeYYYYMMDDHHMMSSsss = 19210501000000000
setCalendar1 timeZone = GMT
1921.5.1 0:0:0.0
setCalendar2 timeZone = GMT
Initial dateTime = 1921.5.1 0:0:0.0
Final dateTime = 1921.5.1 0:0:0.0
runSetCalendars dateTimeYYYYMMDDHHMMSSsss = 19210502000000000
setCalendar1 timeZone = GMT
1921.5.2 0:0:0.0
setCalendar2 timeZone = GMT
Initial dateTime = 1921.5.2 0:0:0.0
Final dateTime = 1921.5.2 0:0:0.0
runSetCalendars dateTimeYYYYMMDDHHMMSSsss = 19420403000000000
setCalendar1 timeZone = EET
1942.4.3 0:0:0.0
setCalendar2 timeZone = EET
Initial dateTime = 1942.4.3 0:0:0.0
Final dateTime = 1942.4.3 0:0:0.0
runSetCalendars dateTimeYYYYMMDDHHMMSSsss = 19210501000000000
setCalendar1 timeZone = EET
1921.5.1 0:0:0.0
setCalendar2 timeZone = EET
Initial dateTime = 1921.5.1 0:0:0.0
Final dateTime = 1921.5.1 0:0:0.0
runSetCalendars dateTimeYYYYMMDDHHMMSSsss = 19210502000000000
setCalendar1 timeZone = EET
1921.5.2 0:0:0.0
setCalendar2 timeZone = EET
Initial dateTime = 1921.5.2 0:0:0.0
Final dateTime = 1921.5.2 0:0:0.0
runSetCalendars dateTimeYYYYMMDDHHMMSSsss = 19420403000000000
setCalendar1 timeZone = Europe/Helsinki
1942.4.3 0:0:0.0
setCalendar1 failed, dateTimeYYYYMMDDHHMMSSsss = 19420403000000000 Exception = java.lang.RuntimeException: Invalid argument: Cannot convert long to dateTimeYYYYMMDDHHMMSSsss, long = 19420403000000000 Exception message = HOUR_OF_DAY
setCalendar2 timeZone = Europe/Helsinki
Initial dateTime = 1942.4.3 0:0:0.0
Final dateTime = 1942.4.3 1:0:0.0
setCalendar2 failed, dates are not equal
runSetCalendars dateTimeYYYYMMDDHHMMSSsss = 19210501000000000
setCalendar1 timeZone = Europe/Helsinki
1921.5.1 0:0:0.0
setCalendar1 failed, dateTimeYYYYMMDDHHMMSSsss = 19210501000000000 Exception = java.lang.RuntimeException: Invalid argument: Cannot convert long to dateTimeYYYYMMDDHHMMSSsss, long = 19210501000000000 Exception message = MINUTE
setCalendar2 timeZone = Europe/Helsinki
Initial dateTime = 1921.5.1 0:0:0.0
Final dateTime = 1921.5.1 0:20:8.0
setCalendar2 failed, dates are not equal
runSetCalendars dateTimeYYYYMMDDHHMMSSsss = 19210502000000000
setCalendar1 timeZone = Europe/Helsinki
1921.5.2 0:0:0.0
setCalendar2 timeZone = Europe/Helsinki
Initial dateTime = 1921.5.2 0:0:0.0
Final dateTime = 1921.5.2 0:0:0.0
==================
Why does the program fail when timeZone = "Europe/Helsinki"?

Answer 1

Could it be related to the time zone changes which occurred at about this time?
http://www.timeanddate.com/worldclock/clockchange.html?n=101&year=1921