Calculating one year ago today

Question

How do I build an Instant object whose value is one year ago today?

For example if right now is 2015-12-20T11:53 I want an Instant object containing 2014-12-20T11:53.

Instant has a minus function that receives a Duration but Duration doesn't have a years function. There is a class called Period that has a Period.years function but running Period.years(1).toStandardDuration() throws the following exception:

java.lang.UnsupportedOperationException: Cannot convert to Duration as this period contains years and years vary in length

Possible duplicate of [How to get previous month and years in java?](http://stackoverflow.com/questions/12814504/how-to-get-previous-month-and-years-in-java) — Przemek, Dec 20 '15 at 12:05

score 2 · Accepted Answer · edited Dec 20 '15 at 12:04

2

You should use the DateTime.minusYears(int years); method.

http://www.joda.org/joda-time/apidocs/index.html

edited Dec 20 '15 at 12:04

Benjy Kessler

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answered Dec 20 '15 at 12:00

Stultuske

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What object has a minusYears method? – Benjy Kessler Dec 20 '15 at 12:01
`DateTime` has a minusYears method. You can get a `DateTime` from an `Instant` by calling `toDateTime`. – Wander Nauta Dec 20 '15 at 12:03
The OP is using Java 8 date time classes not JodaTime (as far as I can tell) – munyengm Dec 20 '15 at 12:08
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@munyengm: have you checked the tags he added to his post? – Stultuske Dec 20 '15 at 12:08

Calculating one year ago today

1 Answers1