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

        int ageThreshold = 5;
        DateTime now = DateTime.now();
        Resource resource = new AWSResource().withId("vol-123").withResourceType(AWSResourceType.EBS_VOLUME)
                .withLaunchTime(new Date(now.minusDays(ageThreshold + 1).getMillis()));
        ((AWSResource) resource).setAWSResourceState("available");
        Date lastDetachTime = new Date(now.minusDays(ageThreshold - 1).getMillis());
        String metaTag = VolumeTaggingMonkey.makeMetaTag(null, null, lastDetachTime);
        resource.setTag(JanitorMonkey.JANITOR_META_TAG, metaTag);
        int retentionDays = 4;
        OldDetachedVolumeRule rule = new OldDetachedVolumeRule(new TestMonkeyCalendar(),
                ageThreshold, retentionDays);

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    @Test
    public void testAttachedVolume() {
        int ageThreshold = 5;
        DateTime now = DateTime.now();
        Resource resource = new AWSResource().withId("vol-123").withResourceType(AWSResourceType.EBS_VOLUME)
                .withLaunchTime(new Date(now.minusDays(ageThreshold + 1).getMillis()));
        ((AWSResource) resource).setAWSResourceState("available");
        String metaTag = VolumeTaggingMonkey.makeMetaTag("i-123", "owner", null);
        resource.setTag(JanitorMonkey.JANITOR_META_TAG, metaTag);
        int retentionDays = 4;
        OldDetachedVolumeRule rule = new OldDetachedVolumeRule(new TestMonkeyCalendar(),

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        DateTime now = DateTime.now();
        Date oldTermDate = new Date(now.plusDays(10).getMillis());
        String oldTermReason = "Foo";
        int ageThreshold = 5;
        Resource resource = new AWSResource().withId("vol-123").withResourceType(AWSResourceType.EBS_VOLUME)
                .withLaunchTime(new Date(now.minusDays(ageThreshold + 1).getMillis()));
        ((AWSResource) resource).setAWSResourceState("available");
        Date lastDetachTime = new Date(now.minusDays(ageThreshold + 1).getMillis());
        String metaTag = VolumeTaggingMonkey.makeMetaTag(null, null, lastDetachTime);
        resource.setTag(JanitorMonkey.JANITOR_META_TAG, metaTag);
        int retentionDays = 4;

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        String oldTermReason = "Foo";
        int ageThreshold = 5;
        Resource resource = new AWSResource().withId("vol-123").withResourceType(AWSResourceType.EBS_VOLUME)
                .withLaunchTime(new Date(now.minusDays(ageThreshold + 1).getMillis()));
        ((AWSResource) resource).setAWSResourceState("available");
        Date lastDetachTime = new Date(now.minusDays(ageThreshold + 1).getMillis());
        String metaTag = VolumeTaggingMonkey.makeMetaTag(null, null, lastDetachTime);
        resource.setTag(JanitorMonkey.JANITOR_META_TAG, metaTag);
        int retentionDays = 4;
        OldDetachedVolumeRule rule = new OldDetachedVolumeRule(new TestMonkeyCalendar(),
                ageThreshold, retentionDays);

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        Resource resource = new AWSResource().withId("launchConfig1").withResourceType(AWSResourceType.LAUNCH_CONFIG);
        resource.setAdditionalField(LaunchConfigJanitorCrawler.LAUNCH_CONFIG_FIELD_USED_BY_ASG, "false");
        MonkeyCalendar calendar = new TestMonkeyCalendar();
        int ageThreshold = 3;
        DateTime now = new DateTime(calendar.now().getTimeInMillis());
        resource.setLaunchTime(new Date(now.minusDays(ageThreshold + 1).getMillis()));
        int retentionDays = 3;
        OldUnusedLaunchConfigRule rule = new OldUnusedLaunchConfigRule(calendar, ageThreshold, retentionDays);
        Assert.assertFalse(rule.isValid(resource));
        TestUtils.verifyTerminationTimeRough(resource, retentionDays, now);
    }

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    public void testOldLaunchConfigWithNullFlag() {
        Resource resource = new AWSResource().withId("launchConfig1").withResourceType(AWSResourceType.LAUNCH_CONFIG);
        MonkeyCalendar calendar = new TestMonkeyCalendar();
        int ageThreshold = 3;
        DateTime now = new DateTime(calendar.now().getTimeInMillis());
        resource.setLaunchTime(new Date(now.minusDays(ageThreshold + 1).getMillis()));
        int retentionDays = 3;
        OldUnusedLaunchConfigRule rule = new OldUnusedLaunchConfigRule(calendar, ageThreshold, retentionDays);
        Assert.assertTrue(rule.isValid(resource));
        Assert.assertNull(resource.getExpectedTerminationTime());
    }

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        Resource resource = new AWSResource().withId("launchConfig1").withResourceType(AWSResourceType.LAUNCH_CONFIG);
        resource.setAdditionalField(LaunchConfigJanitorCrawler.LAUNCH_CONFIG_FIELD_USED_BY_ASG, "false");
        MonkeyCalendar calendar = new TestMonkeyCalendar();
        int ageThreshold = 3;
        DateTime now = new DateTime(calendar.now().getTimeInMillis());
        resource.setLaunchTime(new Date(now.minusDays(ageThreshold - 1).getMillis()));
        int retentionDays = 3;
        OldUnusedLaunchConfigRule rule = new OldUnusedLaunchConfigRule(calendar, ageThreshold, retentionDays);
        Assert.assertTrue(rule.isValid(resource));
        Assert.assertNull(resource.getExpectedTerminationTime());
    }

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        Resource resource = new AWSResource().withId("launchConfig1").withResourceType(AWSResourceType.LAUNCH_CONFIG);
        resource.setAdditionalField(LaunchConfigJanitorCrawler.LAUNCH_CONFIG_FIELD_USED_BY_ASG, "true");
        MonkeyCalendar calendar = new TestMonkeyCalendar();
        int ageThreshold = 3;
        DateTime now = new DateTime(calendar.now().getTimeInMillis());
        resource.setLaunchTime(new Date(now.minusDays(ageThreshold + 1).getMillis()));
        int retentionDays = 3;
        OldUnusedLaunchConfigRule rule = new OldUnusedLaunchConfigRule(calendar, ageThreshold, retentionDays);
        Assert.assertTrue(rule.isValid(resource));
        Assert.assertNull(resource.getExpectedTerminationTime());
    }

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        Resource resource = new AWSResource().withId("launchConfig1").withResourceType(AWSResourceType.LAUNCH_CONFIG);
        resource.setAdditionalField(LaunchConfigJanitorCrawler.LAUNCH_CONFIG_FIELD_USED_BY_ASG, "false");
        MonkeyCalendar calendar = new TestMonkeyCalendar();
        int ageThreshold = 3;
        DateTime now = new DateTime(calendar.now().getTimeInMillis());
        resource.setLaunchTime(new Date(now.minusDays(ageThreshold + 1).getMillis()));
        Date oldTermDate = new Date(now.minusDays(10).getMillis());
        String oldTermReason = "Foo";
        resource.setExpectedTerminationTime(oldTermDate);
        resource.setTerminationReason(oldTermReason);
        int retentionDays = 3;

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        resource.setAdditionalField(LaunchConfigJanitorCrawler.LAUNCH_CONFIG_FIELD_USED_BY_ASG, "false");
        MonkeyCalendar calendar = new TestMonkeyCalendar();
        int ageThreshold = 3;
        DateTime now = new DateTime(calendar.now().getTimeInMillis());
        resource.setLaunchTime(new Date(now.minusDays(ageThreshold + 1).getMillis()));
        Date oldTermDate = new Date(now.minusDays(10).getMillis());
        String oldTermReason = "Foo";
        resource.setExpectedTerminationTime(oldTermDate);
        resource.setTerminationReason(oldTermReason);
        int retentionDays = 3;
        OldUnusedLaunchConfigRule rule = new OldUnusedLaunchConfigRule(calendar, ageThreshold, retentionDays);

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