Examples of org.joda.time.DateTime.minusDays()

org.joda.time.DateTime.minusDays()
Returns a copy of this datetime minus the specified number of days.
The calculation will do its best to only change the day field retaining the same time of day. However, in certain circumstances, typically daylight savings cutover, it may be necessary to alter the time fields.
In spring an hour is typically removed. If subtracting one day results in the time being within the cutover then the time is adjusted to be within summer time. For example, if the cutover is from 01:59 to 03:00 and the result of this method would have been 02:30, then the result will be adjusted to 03:30.
The following three lines are identical in effect:
```
 DateTime subtracted = dt.minusDays(6); DateTime subtracted = dt.minus(Period.days(6)); DateTime subtracted = dt.withFieldAdded(DurationFieldType.days(), -6); 
```
This datetime instance is immutable and unaffected by this method call. @param days the amount of days to subtract, may be negative @return the new datetime minus the increased days @since 1.1

    @Test
    public void testSnapshotWithoutAMINotOld() {
        int ageThreshold = 5;
        DateTime now = DateTime.now();
        Resource resource = new AWSResource().withId("snap123").withResourceType(AWSResourceType.EBS_SNAPSHOT)
                .withLaunchTime(new Date(now.minusDays(ageThreshold - 1).getMillis()));
        ((AWSResource) resource).setAWSResourceState("completed");
        int retentionDays = 4;
        NoGeneratedAMIRule rule = new NoGeneratedAMIRule(new TestMonkeyCalendar(),
                ageThreshold, retentionDays);
        Assert.assertTrue(rule.isValid(resource));

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    @Test
    public void testWithAMIs() {
        int ageThreshold = 5;
        DateTime now = DateTime.now();
        Resource resource = new AWSResource().withId("snap123").withResourceType(AWSResourceType.EBS_SNAPSHOT)
                .withLaunchTime(new Date(now.minusDays(ageThreshold + 1).getMillis()));
        ((AWSResource) resource).setAWSResourceState("completed");
        resource.setAdditionalField(EBSSnapshotJanitorCrawler.SNAPSHOT_FIELD_AMIS, "ami-123");
        int retentionDays = 4;
        NoGeneratedAMIRule rule = new NoGeneratedAMIRule(new TestMonkeyCalendar(),
                ageThreshold, retentionDays);

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    @Test
    public void testResourceWithExpectedTerminationTimeSet() {
        int ageThreshold = 5;
        DateTime now = DateTime.now();
        Resource resource = new AWSResource().withId("snap123").withResourceType(AWSResourceType.EBS_SNAPSHOT)
                .withLaunchTime(new Date(now.minusDays(ageThreshold + 1).getMillis()));
        ((AWSResource) resource).setAWSResourceState("completed");
        Date oldTermDate = new Date(now.plusDays(10).getMillis());
        String oldTermReason = "Foo";
        int retentionDays = 4;
        NoGeneratedAMIRule rule = new NoGeneratedAMIRule(new TestMonkeyCalendar(),

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        resource.setAdditionalField(ASGJanitorCrawler.ASG_FIELD_MAX_SIZE, "0");
        int launchConfiguAgeThreshold = 60;
        MonkeyCalendar calendar = new TestMonkeyCalendar();
        DateTime now = new DateTime(calendar.now().getTimeInMillis());
        resource.setAdditionalField(ASGJanitorCrawler.ASG_FIELD_LC_CREATION_TIME,
                String.valueOf(now.minusDays(launchConfiguAgeThreshold + 1).getMillis()));
        int retentionDays = 3;
        OldEmptyASGRule rule = new OldEmptyASGRule(calendar, launchConfiguAgeThreshold, retentionDays,
                new DummyASGInstanceValidator());
        Assert.assertFalse(rule.isValid(resource));
        TestUtils.verifyTerminationTimeRough(resource, retentionDays, now);

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        resource.setAdditionalField(ASGJanitorCrawler.ASG_FIELD_MAX_SIZE, "0");
        int launchConfiguAgeThreshold = 60;
        MonkeyCalendar calendar = new TestMonkeyCalendar();
        DateTime now = new DateTime(calendar.now().getTimeInMillis());
        resource.setAdditionalField(ASGJanitorCrawler.ASG_FIELD_LC_CREATION_TIME,
                String.valueOf(now.minusDays(launchConfiguAgeThreshold - 1).getMillis()));
        int retentionDays = 3;
        OldEmptyASGRule rule = new OldEmptyASGRule(calendar, launchConfiguAgeThreshold, retentionDays,
                new DummyASGInstanceValidator());
        Assert.assertTrue(rule.isValid(resource));
        Assert.assertNull(resource.getExpectedTerminationTime());

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    @Test
    public void testOrphanedInstancesWithOwner() {
        int ageThreshold = 5;
        DateTime now = DateTime.now();
        Resource resource = new AWSResource().withId("i-12345678").withResourceType(AWSResourceType.INSTANCE)
                .withLaunchTime(new Date(now.minusDays(ageThreshold + 1).getMillis()))
                .withOwnerEmail("owner@foo.com");
        ((AWSResource) resource).setAWSResourceState("running");
        int retentionDaysWithOwner = 4;
        int retentionDaysWithoutOwner = 8;
        OrphanedInstanceRule rule = new OrphanedInstanceRule(new TestMonkeyCalendar(),

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        resource.setAdditionalField(ASGJanitorCrawler.ASG_FIELD_INSTANCES, "i-1,i-2");
        int launchConfiguAgeThreshold = 60;
        MonkeyCalendar calendar = new TestMonkeyCalendar();
        DateTime now = new DateTime(calendar.now().getTimeInMillis());
        resource.setAdditionalField(ASGJanitorCrawler.ASG_FIELD_LC_CREATION_TIME,
                String.valueOf(now.minusDays(launchConfiguAgeThreshold + 1).getMillis()));
        int retentionDays = 3;
        OldEmptyASGRule rule = new OldEmptyASGRule(calendar, launchConfiguAgeThreshold, retentionDays,
                new DummyASGInstanceValidator());
        Assert.assertTrue(rule.isValid(resource));
        Assert.assertNull(resource.getExpectedTerminationTime());

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    @Test
    public void testOrphanedInstancesWithoutOwner() {
        int ageThreshold = 5;
        DateTime now = DateTime.now();
        Resource resource = new AWSResource().withId("i-12345678").withResourceType(AWSResourceType.INSTANCE)
                .withLaunchTime(new Date(now.minusDays(ageThreshold + 1).getMillis()));
        ((AWSResource) resource).setAWSResourceState("running");
        int retentionDaysWithOwner = 4;
        int retentionDaysWithoutOwner = 8;
        OrphanedInstanceRule rule = new OrphanedInstanceRule(new TestMonkeyCalendar(),
                ageThreshold, retentionDaysWithOwner, retentionDaysWithoutOwner);

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        resource.setAdditionalField(ASGJanitorCrawler.ASG_FIELD_MAX_SIZE, "2");
        int launchConfiguAgeThreshold = 60;
        MonkeyCalendar calendar = new TestMonkeyCalendar();
        DateTime now = new DateTime(calendar.now().getTimeInMillis());
        resource.setAdditionalField(ASGJanitorCrawler.ASG_FIELD_LC_CREATION_TIME,
                String.valueOf(now.minusDays(launchConfiguAgeThreshold + 1).getMillis()));
        int retentionDays = 3;
        OldEmptyASGRule rule = new OldEmptyASGRule(calendar, launchConfiguAgeThreshold, retentionDays,
                new DummyASGInstanceValidator());
        Assert.assertTrue(rule.isValid(resource));
        Assert.assertNull(resource.getExpectedTerminationTime());

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    @Test
    public void testOrphanedInstancesWithLaunchTimeNotExpires() {
        int ageThreshold = 5;
        DateTime now = DateTime.now();
        Resource resource = new AWSResource().withId("i-12345678").withResourceType(AWSResourceType.INSTANCE)
                .withLaunchTime(new Date(now.minusDays(ageThreshold - 1).getMillis()));
        ((AWSResource) resource).setAWSResourceState("running");
        int retentionDaysWithOwner = 4;
        int retentionDaysWithoutOwner = 8;
        OrphanedInstanceRule rule = new OrphanedInstanceRule(new TestMonkeyCalendar(),
                ageThreshold, retentionDaysWithOwner, retentionDaysWithoutOwner);

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