Examples of org.joda.time.Instant

org.joda.time.Instant
Instant is the standard implementation of a fully immutable instant in time.
Instant is an implementation of {@link ReadableInstant}. As with all instants, it represents an exact point on the time-line, but limited to the precision of milliseconds. An Instant should be used to represent a point in time irrespective of any other factor, such as chronology or time zone.
Internally, the class holds one piece of data, the instant as milliseconds from the Java epoch of 1970-01-01T00:00:00Z.
For example, an Instant can be used to compare two DateTime objects irrespective of chronology or time zone.
```
 boolean sameInstant = dt1.toInstant().equals(dt2.toInstant()); 
```
Note that the following code will also perform the same check:
```
 boolean sameInstant = dt1.isEqual(dt2); 
```
Instant is thread-safe and immutable. @author Stephen Colebourne @since 1.0

  }


  @Test
  public void testPartitionFieldConstraints() {
    GenericEvent e = new GenericEvent();
    DateTime eventDateTime = new Instant(e.getTimestamp())
        .toDateTime(DateTimeZone.UTC);


    // these constraints are for partition fields
    Constraints eventDay = emptyConstraints
        .with("year", eventDateTime.getYear())

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  }


  @Test
  public void testPartitionFieldConstraintsMinimized() {
    GenericEvent e = new GenericEvent();
    DateTime eventDateTime = new Instant(e.getTimestamp())
        .toDateTime(DateTimeZone.UTC);


    // year and month constraints are for partition fields
    Constraints green = emptyConstraints
        .from("year", eventDateTime.getYear()) // will be removed

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    */
   public final static String DOT_SNAPSHOT_DIR = ".snapshot";


   public static Instant newInstantFromString(String value) {
     if (value.equalsIgnoreCase(Parameters.DATE_TIME_NOW)) {
       return new Instant();
     }


     return new Instant(DATE_TIME_PARSER.parseMillis(value));
   }

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   public static Period newPeriodFromString(String value) {
     return PERIOD_FORMATTER.parsePeriod(value);
   }


   public static String printDate(Date date) {
     return DATE_TIME_PRINTER.print(new Instant(date));
   }

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       fromDate = newDateFromString(fromString);
       Preconditions.checkArgument(
           fromDate.getTime() < toDate.getTime(),
           "Invalid period specified: 'to' must be later than 'from'.");
     } else {
       Instant fromInstant = new Instant(toDate.getTime()).minus(window);
       fromDate = new Date(fromInstant.getMillis());
     }
     return fromDate;
   }

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            localInstant = iField.set(localInstant, value);
            long result = iZone.convertLocalToUTC(localInstant, false);
            if (get(result) != value) {
                throw new IllegalFieldValueException(iField.getType(), new Integer(value),
                    "Illegal instant due to time zone offset transition: " +
                    DateTimeFormat.forPattern("yyyy-MM-dd'T'HH:mm:ss.SSS").print(new Instant(localInstant)) +
                    " (" + iZone.getID() + ")");
            }
            return result;
        }

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     * Get this object as an Instant.
     * 
     * @return an Instant using the same millis
     */
    public Instant toInstant() {
        return new Instant(getMillis());
    }

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        int offset = zone.getOffsetFromLocal(instant);
        instant -= offset;
        if (offset != zone.getOffset(instant)) {
            throw new IllegalArgumentException
                ("Illegal instant due to time zone offset transition: " +
                    DateTimeFormat.forPattern("yyyy-MM-dd'T'HH:mm:ss.SSS").print(new Instant(instant)));
        }
        return instant;
    }

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            DateTimeZone zone,
            ReadableInstant gregorianCutover,
            int minDaysInFirstWeek) {
        
        zone = DateTimeUtils.getZone(zone);
        Instant cutoverInstant;
        if (gregorianCutover == null) {
            cutoverInstant = DEFAULT_CUTOVER;
        } else {
            cutoverInstant = gregorianCutover.toInstant();
        }


        GJChronology chrono;


        ArrayList chronos = (ArrayList)cCache.get(zone);
        if (chronos == null) {
            chronos = new ArrayList(2);
            cCache.put(zone, chronos);
        } else {
            for (int i=chronos.size(); --i>=0; ) {
                chrono = (GJChronology)chronos.get(i);
                if (minDaysInFirstWeek == chrono.getMinimumDaysInFirstWeek() &&
                    cutoverInstant.equals(chrono.getGregorianCutover())) {
                    
                    return chrono;
                }
            }
        }

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    public static GJChronology getInstance(
            DateTimeZone zone,
            long gregorianCutover,
            int minDaysInFirstWeek) {
        
        Instant cutoverInstant;
        if (gregorianCutover == DEFAULT_CUTOVER.getMillis()) {
            cutoverInstant = null;
        } else {
            cutoverInstant = new Instant(gregorianCutover);
        }
        return getInstance(zone, cutoverInstant, minDaysInFirstWeek);
    }

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