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CalendarImpl.javaAPI DocJ2ME CLDC 1.129646Wed Feb 05 15:55:58 GMT 2003com.sun.cldc.util.j2me

CalendarImpl

public class CalendarImpl extends Calendar
This class is an implementation of the subsetted CLDC 1.1 Calendar class.
author
Kinsley Wong
see
java.util.Calendar
see
java.util.TimeZone

Fields Summary
private static final int
BC
private static final int
AD
private static final int
JAN_1_1_JULIAN_DAY
private static final int
EPOCH_JULIAN_DAY
private static final int[]
NUM_DAYS
private static final int[]
LEAP_NUM_DAYS
private static final int
ONE_SECOND
Useful millisecond constants. Although ONE_DAY and ONE_WEEK can fit into ints, they must be longs in order to prevent arithmetic overflow when performing (bug 4173516).
private static final int
ONE_MINUTE
private static final int
ONE_HOUR
private static final long
ONE_DAY
private static final long
ONE_WEEK
private static final long
gregorianCutover
The point at which the Gregorian calendar rules are used, measured in milliseconds from the standard epoch. Default is October 15, 1582 (Gregorian) 00:00:00 UTC or -12219292800000L. For this value, October 4, 1582 (Julian) is followed by October 15, 1582 (Gregorian). This corresponds to Julian day number 2299161.
private static final int
gregorianCutoverYear
The year of the gregorianCutover, with 0 representing 1 BC, -1 representing 2 BC, etc.
static String[]
months
static String[]
days
Constructors Summary
public CalendarImpl()


      
        super();
Methods Summary
private static final java.lang.StringBufferappendFourDigits(java.lang.StringBuffer sb, int number)

        if (number >= 0 && number < 1000) {
            sb.append('0");
            if (number < 100) {
                sb.append('0");
            }
            if (number < 10) {
                sb.append('0");
            }
        }
        return sb.append(number);
private static final java.lang.StringBufferappendTwoDigits(java.lang.StringBuffer sb, int number)

        if (number < 10) {
            sb.append('0");
        }
        return sb.append(number);
private final longcalculateJulianDay(boolean isGregorian, int year)
Compute the Julian day number under either the Gregorian or the Julian calendar, using the given year and the remaining fields.

param
isGregorian if true, use the Gregorian calendar
param
year the adjusted year number, with 0 indicating the year 1 BC, -1 indicating 2 BC, etc.
return
the Julian day number

        int month = 0;
        long millis = 0;

        month = this.fields[MONTH] - JANUARY;

        // If the month is out of range, adjust it into range
        if (month < 0 || month > 11) {
            int[] rem = new int[1];
            year += floorDivide(month, 12, rem);
            month = rem[0];
        }

        boolean isLeap = year%4 == 0;

        long julianDay =
            365L*(year - 1) + floorDivide((year - 1), 4) + (JAN_1_1_JULIAN_DAY - 3);

        if (isGregorian) {
            isLeap = isLeap && ((year%100 != 0) || (year%400 == 0));
            // Add 2 because Gregorian calendar starts 2 days after Julian calendar
            julianDay +=
                floorDivide((year - 1), 400) - floorDivide((year - 1), 100) + 2;
        }

        // At this point julianDay is the 0-based day BEFORE the first day of
        // January 1, year 1 of the given calendar.  If julianDay == 0, it
        // specifies (Jan. 1, 1) - 1, in whatever calendar we are using (Julian
        // or Gregorian).
        julianDay += isLeap ? LEAP_NUM_DAYS[month] : NUM_DAYS[month];
        julianDay += this.fields[DATE];
        return julianDay;
protected voidcomputeFields()
Converts UTC as milliseconds to time field values.

        int rawOffset = getTimeZone().getRawOffset();
        long localMillis = time + rawOffset;

        // Check for very extreme values -- millis near Long.MIN_VALUE or
        // Long.MAX_VALUE.  For these values, adding the zone offset can push
        // the millis past MAX_VALUE to MIN_VALUE, or vice versa.  This produces
        // the undesirable effect that the time can wrap around at the ends,
        // yielding, for example, a Date(Long.MAX_VALUE) with a big BC year
        // (should be AD).  Handle this by pinning such values to Long.MIN_VALUE
        // or Long.MAX_VALUE. - liu 8/11/98 bug 4149677
        if (time > 0 && localMillis < 0 && rawOffset > 0) {
            localMillis = Long.MAX_VALUE;
        } else if (time < 0 && localMillis > 0 && rawOffset < 0) {
            localMillis = Long.MIN_VALUE;
        }

        // Time to fields takes the wall millis (Standard or DST).
        timeToFields(localMillis);

        long days = (long)(localMillis / ONE_DAY);
        int millisInDay = (int)(localMillis - (days * ONE_DAY));

        if (millisInDay < 0) millisInDay += ONE_DAY;

        // Call getOffset() to get the TimeZone offset.
        // The millisInDay value must be standard local millis.
        int dstOffset = getTimeZone().getOffset(AD,
                                 this.fields[YEAR],
                                 this.fields[MONTH],
                                 this.fields[DATE],
                                 this.fields[DAY_OF_WEEK],
                                 millisInDay) - rawOffset;

        // Adjust our millisInDay for DST, if necessary.
        millisInDay += dstOffset;

        // If DST has pushed us into the next day,
        // we must call timeToFields() again.
        // This happens in DST between 12:00 am and 1:00 am every day.
        // The call to timeToFields() will give the wrong day,
        // since the Standard time is in the previous day
        if (millisInDay >= ONE_DAY) {
            long dstMillis = localMillis + dstOffset;
            millisInDay -= ONE_DAY;
            // As above, check for and pin extreme values
            if (localMillis > 0 && dstMillis < 0 && dstOffset > 0) {
                dstMillis = Long.MAX_VALUE;
            } else if (localMillis < 0 && dstMillis > 0 && dstOffset < 0) {
                dstMillis = Long.MIN_VALUE;
            }
            timeToFields(dstMillis);
        }

        // Fill in all time-related fields based on millisInDay.
        // so as not to perturb flags.
        this.fields[MILLISECOND] = millisInDay % 1000;
        millisInDay /= 1000;

        this.fields[SECOND] = millisInDay % 60;
        millisInDay /= 60;

        this.fields[MINUTE] = millisInDay % 60;
        millisInDay /= 60;

        this.fields[HOUR_OF_DAY] = millisInDay;
        this.fields[AM_PM] = millisInDay / 12;
        this.fields[HOUR] = millisInDay % 12;
protected voidcomputeTime()
Converts time field values to UTC as milliseconds.

exception
IllegalArgumentException if any fields are invalid.


        correctTime();

        // This function takes advantage of the fact that unset fields in
        // the time field list have a value of zero.

        // First, use the year to determine whether to use the Gregorian or the
        // Julian calendar. If the year is not the year of the cutover, this
        // computation will be correct. But if the year is the cutover year,
        // this may be incorrect. In that case, assume the Gregorian calendar,
        // make the computation, and then recompute if the resultant millis
        // indicate the wrong calendar has been assumed.

        // A date such as Oct. 10, 1582 does not exist in a Gregorian calendar
        // with the default changeover of Oct. 15, 1582, since in such a
        // calendar Oct. 4 (Julian) is followed by Oct. 15 (Gregorian).  This
        // algorithm will interpret such a date using the Julian calendar,
        // yielding Oct. 20, 1582 (Gregorian).
        int year = this.fields[YEAR];
        boolean isGregorian = year >= gregorianCutoverYear;
        long julianDay = calculateJulianDay(isGregorian, year);
        long millis = julianDayToMillis(julianDay);

        // The following check handles portions of the cutover year BEFORE the
        // cutover itself happens. The check for the julianDate number is for a
        // rare case; it's a hardcoded number, but it's efficient.  The given
        // Julian day number corresponds to Dec 3, 292269055 BC, which
        // corresponds to millis near Long.MIN_VALUE.  The need for the check
        // arises because for extremely negative Julian day numbers, the millis
        // actually overflow to be positive values. Without the check, the
        // initial date is interpreted with the Gregorian calendar, even when
        // the cutover doesn't warrant it.
        if (isGregorian != (millis >= gregorianCutover) &&
            julianDay != -106749550580L) { // See above

            julianDay = calculateJulianDay(!isGregorian, year);
            millis = julianDayToMillis(julianDay);
        }

        // Do the time portion of the conversion.

        int millisInDay = 0;

        // Hours
        // Don't normalize here; let overflow bump into the next period.
        // This is consistent with how we handle other fields.
        millisInDay += this.fields[HOUR_OF_DAY];
        millisInDay *= 60;

        // now get minutes
        millisInDay += this.fields[MINUTE];
        millisInDay *= 60;

        // now get seconds
        millisInDay += this.fields[SECOND];
        millisInDay *= 1000;

        // now get millis
        millisInDay += this.fields[MILLISECOND];

        // Compute the time zone offset and DST offset.  There are two potential
        // ambiguities here.  We'll assume a 2:00 am (wall time) switchover time
        // for discussion purposes here.
        // 1. The transition into DST.  Here, a designated time of 2:00 am - 2:59 am
        //    can be in standard or in DST depending.  However, 2:00 am is an invalid
        //    representation (the representation jumps from 1:59:59 am Std to 3:00:00 am DST).
        //    We assume standard time.
        // 2. The transition out of DST.  Here, a designated time of 1:00 am - 1:59 am
        //    can be in standard or DST.  Both are valid representations (the rep
        //    jumps from 1:59:59 DST to 1:00:00 Std).
        //    Again, we assume standard time.
        // We use the TimeZone object to get the zone offset
        int zoneOffset = getTimeZone().getRawOffset();

        // Now add date and millisInDay together, to make millis contain local wall
        // millis, with no zone or DST adjustments
        millis += millisInDay;

        // Normalize the millisInDay to 0..ONE_DAY-1.  If the millis is out
        // of range, then we must call timeToFields() to recompute our
        // fields.
        int[] normalizedMillisInDay = new int[1];
        floorDivide(millis, (int)ONE_DAY, normalizedMillisInDay);

        // We need to have the month, the day, and the day of the week.
        // Calling timeToFields will compute the MONTH and DATE fields.
        //
        // It's tempting to try to use DAY_OF_WEEK here, if it
        // is set, but we CAN'T.  Even if it's set, it might have
        // been set wrong by the user.  We should rely only on
        // the Julian day number, which has been computed correctly
        // using the disambiguation algorithm above. [LIU]
        int dow = julianDayToDayOfWeek(julianDay);

        // It's tempting to try to use DAY_OF_WEEK here, if it
        // is set, but we CAN'T.  Even if it's set, it might have
        // been set wrong by the user.  We should rely only on
        // the Julian day number, which has been computed correctly
        // using the disambiguation algorithm above. [LIU]
        int dstOffset = getTimeZone().getOffset(AD,
                                 this.fields[YEAR],
                                 this.fields[MONTH],
                                 this.fields[DATE],
                                 dow,
                                 normalizedMillisInDay[0]) -
                                 zoneOffset;
        // Note: Because we pass in wall millisInDay, rather than
        // standard millisInDay, we interpret "1:00 am" on the day
        // of cessation of DST as "1:00 am Std" (assuming the time
        // of cessation is 2:00 am).

        // Store our final computed GMT time, with timezone adjustments.
        time = millis - zoneOffset - dstOffset;
private voidcorrectTime()
Validates the field values for HOUR_OF_DAY, AM_PM and HOUR The calendar will give preference in the following order HOUR_OF_DAY, AM_PM, HOUR

        int value;

        if (isSet[HOUR_OF_DAY]) {
            value = this.fields[HOUR_OF_DAY] % 24;
            this.fields[HOUR_OF_DAY] = value;
            this.fields[AM_PM] = (value < 12) ? AM : PM;
            this.isSet[HOUR_OF_DAY] = false;
            return;
        }

        if(isSet[AM_PM]) {
            // Determines AM PM with the 24 hour clock
            // This prevents the user from inputing an invalid one.
            if (this.fields[AM_PM] != AM && this.fields[AM_PM] != PM) {
                value = this.fields[HOUR_OF_DAY];
                this.fields[AM_PM] = (value < 12) ? AM : PM;
            }
            this.isSet[AM_PM] = false;
        }

        if (isSet[HOUR]) {
            value = this.fields[HOUR];
            if (value > 12) {
                this.fields[HOUR_OF_DAY] = (value % 12) + 12;
                this.fields[HOUR] = value % 12;
                this.fields[AM_PM] = PM;
            } else {
                if (this.fields[AM_PM] == PM) {
                    this.fields[HOUR_OF_DAY] = value + 12;
                } else {
                    this.fields[HOUR_OF_DAY] = value;
                }
            }
            this.isSet[HOUR] = false;
        }
private static final longfloorDivide(long numerator, long denominator)
Divide two long integers, returning the floor of the quotient.

Unlike the built-in division, this is mathematically well-behaved. E.g., -1/4 => 0 but floorDivide(-1,4) => -1.

param
numerator the numerator
param
denominator a divisor which must be > 0
return
the floor of the quotient.

        // We do this computation in order to handle
        // a numerator of Long.MIN_VALUE correctly
        return (numerator >= 0) ?
            numerator / denominator :
            ((numerator + 1) / denominator) - 1;
private static final intfloorDivide(int numerator, int denominator)
Divide two integers, returning the floor of the quotient.

Unlike the built-in division, this is mathematically well-behaved. E.g., -1/4 => 0 but floorDivide(-1,4) => -1.

param
numerator the numerator
param
denominator a divisor which must be > 0
return
the floor of the quotient.

        // We do this computation in order to handle
        // a numerator of Integer.MIN_VALUE correctly
        return (numerator >= 0) ?
            numerator / denominator :
            ((numerator + 1) / denominator) - 1;
private static final intfloorDivide(int numerator, int denominator, int[] remainder)
Divide two integers, returning the floor of the quotient, and the modulus remainder.

Unlike the built-in division, this is mathematically well-behaved. E.g., -1/4 => 0 and -1%4 => -1, but floorDivide(-1,4) => -1 with remainder[0] => 3.

param
numerator the numerator
param
denominator a divisor which must be > 0
param
remainder an array of at least one element in which the value numerator mod denominator is returned. Unlike numerator % denominator, this will always be non-negative.
return
the floor of the quotient.


        if (numerator >= 0) {
            remainder[0] = numerator % denominator;
            return numerator / denominator;
        }
        int quotient = ((numerator + 1) / denominator) - 1;
        remainder[0] = numerator - (quotient * denominator);
        return quotient;
private static final intfloorDivide(long numerator, int denominator, int[] remainder)
Divide two integers, returning the floor of the quotient, and the modulus remainder.

Unlike the built-in division, this is mathematically well-behaved. E.g., -1/4 => 0 and -1%4 => -1, but floorDivide(-1,4) => -1 with remainder[0] => 3.

param
numerator the numerator
param
denominator a divisor which must be > 0
param
remainder an array of at least one element in which the value numerator mod denominator is returned. Unlike numerator % denominator, this will always be non-negative.
return
the floor of the quotient.


        if (numerator >= 0) {
            remainder[0] = (int)(numerator % denominator);
            return (int)(numerator / denominator);
        }
        int quotient = (int)(((numerator + 1) / denominator) - 1);
        remainder[0] = (int)(numerator - (quotient * denominator));
        return quotient;
private static final intjulianDayToDayOfWeek(long julian)

        // If julian is negative, then julian%7 will be negative, so we adjust
        // accordingly.  We add 1 because Julian day 0 is Monday.
        int dayOfWeek = (int)((julian + 1) % 7);
        return dayOfWeek + ((dayOfWeek < 0) ? (7 + SUNDAY) : SUNDAY);
private static final longjulianDayToMillis(long julian)
Converts Julian day to time as milliseconds.

param
julian the given Julian day number.
return
time as milliseconds.

        return (julian - EPOCH_JULIAN_DAY) * ONE_DAY;
private static final longmillisToJulianDay(long millis)
Converts time as milliseconds to Julian day.

param
millis the given milliseconds.
return
the Julian day number.

        return EPOCH_JULIAN_DAY + floorDivide(millis, ONE_DAY);
private final voidtimeToFields(long theTime)
Convert the time as milliseconds to the date fields. Millis must be given as local wall millis to get the correct local day. For example, if it is 11:30 pm Standard, and DST is in effect, the correct DST millis must be passed in to get the right date.

Fields that are completed by this method: YEAR, MONTH, DATE, DAY_OF_WEEK.

param
theTime the time in wall millis (either Standard or DST), whichever is in effect

        int dayOfYear, weekCount, rawYear;
        boolean isLeap;

        // Compute the year, month, and day of month from the given millis
        if (theTime >= gregorianCutover) {

            // The Gregorian epoch day is zero for Monday January 1, year 1.
            long gregorianEpochDay =
                millisToJulianDay(theTime) - JAN_1_1_JULIAN_DAY;

            // Here we convert from the day number to the multiple radix
            // representation.  We use 400-year, 100-year, and 4-year cycles.
            // For example, the 4-year cycle has 4 years + 1 leap day; giving
            // 1461 == 365*4 + 1 days.
            int[] rem = new int[1];

            // 400-year cycle length
            int n400 = floorDivide(gregorianEpochDay, 146097, rem);

            // 100-year cycle length
            int n100 = floorDivide(rem[0], 36524, rem);

            // 4-year cycle length
            int n4 = floorDivide(rem[0], 1461, rem);

            int n1 = floorDivide(rem[0], 365, rem);
            rawYear = 400*n400 + 100*n100 + 4*n4 + n1;

            // zero-based day of year
            dayOfYear = rem[0];

            // Dec 31 at end of 4- or 400-yr cycle
            if (n100 == 4 || n1 == 4) {
                dayOfYear = 365;
            } else {
                ++rawYear;
            }

            // equiv. to (rawYear%4 == 0)
            isLeap =
                ((rawYear&0x3) == 0) && (rawYear%100 != 0 || rawYear%400 == 0);

            // Gregorian day zero is a Monday
            this.fields[DAY_OF_WEEK] = (int)((gregorianEpochDay+1) % 7);
        } else {
            // The Julian epoch day (not the same as Julian Day)
            // is zero on Saturday December 30, 0 (Gregorian).
            long julianEpochDay =
                millisToJulianDay(theTime) - (JAN_1_1_JULIAN_DAY - 2);

            rawYear = (int) floorDivide(4*julianEpochDay + 1464, 1461);

            // Compute the Julian calendar day number for January 1, year
            long january1 = 365*(rawYear-1) + floorDivide(rawYear-1, 4);
            dayOfYear = (int)(julianEpochDay - january1); // 0-based

            // Julian leap years occurred historically every 4 years starting
            // with 8 AD.  Before 8 AD the spacing is irregular; every 3 years
            // from 45 BC to 9 BC, and then none until 8 AD.  However, we don't
            // implement this historical detail; instead, we implement the
            // computationally cleaner proleptic calendar, which assumes
            // consistent 4-year cycles throughout time.

            // equiv. to (rawYear%4 == 0)
            isLeap = ((rawYear&0x3) == 0);

            // Julian calendar day zero is a Saturday
            this.fields[DAY_OF_WEEK] = (int)((julianEpochDay-1) % 7);
        }

        // Common Julian/Gregorian calculation
        int correction = 0;

        // zero-based DOY for March 1
        int march1 = isLeap ? 60 : 59;

        if (dayOfYear >= march1) correction = isLeap ? 1 : 2;

        // zero-based month
        int month_field = (12 * (dayOfYear + correction) + 6) / 367;

        // one-based DOM
        int date_field = dayOfYear -
            (isLeap ? LEAP_NUM_DAYS[month_field] : NUM_DAYS[month_field]) + 1;

        // Normalize day of week
        this.fields[DAY_OF_WEEK] += (this.fields[DAY_OF_WEEK] < 0) ? (SUNDAY+7) : SUNDAY;

        this.fields[YEAR] = rawYear;

        // If year is < 1 we are in BC
        if (this.fields[YEAR] < 1) {
            this.fields[YEAR] = 1 - this.fields[YEAR];
        }

        // 0-based
        this.fields[MONTH] = month_field + JANUARY;
        this.fields[DATE] = date_field;
public static java.lang.StringtoISO8601String(java.util.Calendar calendar)
Converts this Date object to a String. The output format is as follows: 
yyyy MM dd hh mm ss +zzzz
where:
  • yyyy
    is the year, as four decimal digits. Year values larger than
    9999
    will be truncated to
    9999
    .
  • MM
    is the month (
    01
    through
    12
    ), as two decimal digits.
  • dd
    is the day of the month (
    01
    through
    31
    ), as two decimal digits.
  • hh
    is the hour of the day (
    00
    through
    23
    ), as two decimal digits.
  • mm
    is the minute within the hour (
    00
    through
    59
    ), as two decimal digits.
  • ss
    is the second within the minute (
    00
    through
    59
    ), as two decimal digits.
  • zzzz
    is the time zone offset in hours and minutes (four decimal digits
    "hhmm"
    ) relative to GMT, preceded by a "+" or "-" character (
    -1200
    through
    +1200
    ). For instance, Pacific Standard Time zone is printed as
    -0800
    . GMT is printed as
    +0000
    .

return
a string representation of this date.

        // Printing in the absence of a Calendar
        // implementation class is not supported
        if (calendar == null) {
            return "0000 00 00 00 00 00 +0000";
        }

        int year = calendar.get(Calendar.YEAR);
        int month = calendar.get(Calendar.MONTH) + 1;
        int day = calendar.get(Calendar.DAY_OF_MONTH);
        int hour_of_day = calendar.get(Calendar.HOUR_OF_DAY);
        int hour = calendar.get(Calendar.HOUR);
        int minute = calendar.get(Calendar.MINUTE);
        int seconds = calendar.get(Calendar.SECOND);

        String yr = Integer.toString(year);

        // The total size of the string buffer
        // yr.length+1+2+1+2+1+2+1+2+1+2+1+5 = 25 + yr.length
        StringBuffer sb = new StringBuffer(25 + yr.length());

        appendFourDigits(sb, year).append(' ");
        appendTwoDigits(sb, month).append(' ");
        appendTwoDigits(sb, day).append(' ");
        appendTwoDigits(sb, hour_of_day).append(' ");
        appendTwoDigits(sb, minute).append(' ");
        appendTwoDigits(sb, seconds).append(' ");

        // TimeZone offset is represented in milliseconds.
        // Convert the offset to minutes:
        TimeZone t = calendar.getTimeZone();
        int zoneOffsetInMinutes = t.getRawOffset() / 1000 / 60;

        if (zoneOffsetInMinutes < 0) {
            zoneOffsetInMinutes = Math.abs(zoneOffsetInMinutes);
            sb.append('-");
        } else {
            sb.append('+");
        }

        int zoneHours = zoneOffsetInMinutes / 60;
        int zoneMinutes = zoneOffsetInMinutes % 60;

        appendTwoDigits(sb, zoneHours);
        appendTwoDigits(sb, zoneMinutes);

        return sb.toString();
public static java.lang.StringtoString(java.util.Calendar calendar)
Converts this Date object to a String of the form: 
dow mon dd hh:mm:ss zzz yyyy
where:
  • dow is the day of the week (Sun, Mon, Tue, Wed, Thu, Fri, Sat).
  • mon is the month (Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec).
  • dd is the day of the month (01 through 31), as two decimal digits.
  • hh is the hour of the day (00 through 23), as two decimal digits.
  • mm is the minute within the hour (00 through 59), as two decimal digits.
  • ss is the second within the minute (00 through 61, as two decimal digits.
  • zzz is the time zone (and may reflect daylight savings time). If time zone information is not available, then zzz is empty - that is, it consists of no characters at all.
  • yyyy is the year, as four decimal digits.

return
a string representation of this date.


                                                                                                                                                                                                      
         
        // Printing in the absence of a Calendar
        // implementation class is not supported
        if (calendar == null) {
            return "Thu Jan 01 00:00:00 UTC 1970";
        }

        int dow = calendar.get(Calendar.DAY_OF_WEEK);
        int month = calendar.get(Calendar.MONTH);
        int day = calendar.get(Calendar.DAY_OF_MONTH);
        int hour_of_day = calendar.get(Calendar.HOUR_OF_DAY);
        int minute = calendar.get(Calendar.MINUTE);
        int seconds = calendar.get(Calendar.SECOND);
        int year = calendar.get(Calendar.YEAR);

        String yr = Integer.toString(year);

        TimeZone zone = calendar.getTimeZone();
        String zoneID = zone.getID();
        if (zoneID == null) zoneID = "";

        // The total size of the string buffer
        // 3+1+3+1+2+1+2+1+2+1+2+1+zoneID.length+1+yr.length
        //  = 21 + zoneID.length + yr.length
        StringBuffer sb = new StringBuffer(25 + zoneID.length() + yr.length());

        sb.append(days[dow-1]).append(' ");
        sb.append(months[month]).append(' ");
        appendTwoDigits(sb, day).append(' ");
        appendTwoDigits(sb, hour_of_day).append(':");
        appendTwoDigits(sb, minute).append(':");
        appendTwoDigits(sb, seconds).append(' ");
        if (zoneID.length() > 0) sb.append(zoneID).append(' ");
        appendFourDigits(sb, year);

        return sb.toString();