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

        DateTime now = DateTime.now();
        Date oldTermDate = new Date(now.plusDays(10).getMillis());
        String oldTermReason = "Foo";
        int ageThreshold = 5;
        Resource resource = new AWSResource().withId("i-12345678").withResourceType(AWSResourceType.INSTANCE)
                .withLaunchTime(new Date(now.minusDays(ageThreshold + 1).getMillis()))
                .withExpectedTerminationTime(oldTermDate)
                .withTerminationReason(oldTermReason);
        ((AWSResource) resource).setAWSResourceState("running");
        int retentionDaysWithOwner = 4;
        int retentionDaysWithoutOwner = 8;

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    @Test
    public void testTaggedAsNotMark() {
        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;

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        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 testNoMetaTag() {
        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");
        int retentionDays = 4;
        OldDetachedVolumeRule rule = new OldDetachedVolumeRule(new TestMonkeyCalendar(),
                ageThreshold, retentionDays);
        resource.setTag(JanitorMonkey.JANITOR_TAG, "donotmark");

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    @Test
    public void testUserSpecifiedTerminationDate() {
        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");
        int retentionDays = 4;
        DateTime userDate = new DateTime(now.plusDays(3).withTimeAtStartOfDay());
        resource.setTag(JanitorMonkey.JANITOR_TAG,
                OldDetachedVolumeRule.TERMINATION_DATE_FORMATTER.print(userDate));

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    @Test
    public void testOldDetachedVolume() {
        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;

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        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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        int ageThreshold = 5;
        //here we set the create date to a few days before a known DST cutover, where
        //we observed DST failures
        DateTime closeToSpringAheadDst = new DateTime(2014, 3, 7, 0, 0, DateTimeZone.forID("America/Los_Angeles"));
        Resource resource = new AWSResource().withId("vol-123").withResourceType(AWSResourceType.EBS_VOLUME)
            .withLaunchTime(new Date(closeToSpringAheadDst.minusDays(ageThreshold + 1).getMillis()));
        ((AWSResource) resource).setAWSResourceState("available");
        Date lastDetachTime = new Date(closeToSpringAheadDst.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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        //we observed DST failures
        DateTime closeToSpringAheadDst = new DateTime(2014, 3, 7, 0, 0, DateTimeZone.forID("America/Los_Angeles"));
        Resource resource = new AWSResource().withId("vol-123").withResourceType(AWSResourceType.EBS_VOLUME)
            .withLaunchTime(new Date(closeToSpringAheadDst.minusDays(ageThreshold + 1).getMillis()));
        ((AWSResource) resource).setAWSResourceState("available");
        Date lastDetachTime = new Date(closeToSpringAheadDst.minusDays(ageThreshold + 1).getMillis());
        String metaTag = VolumeTaggingMonkey.makeMetaTag(null, null, lastDetachTime);
        resource.setTag(JanitorMonkey.JANITOR_META_TAG, metaTag);
        int retentionDays = 4;


        //set the "now" to the fixed execution date for this rule and create a partial mock

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    @Test
    public void testDetachedVolumeNotOld() {
        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;

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