Silverstripe: Show next year in Template

_config.yml

---
Name: mysite
After:
  - 'framework/*'
  - 'cms/*'
---
# YAML configuration for SilverStripe
# See http://doc.silverstripe.org/framework/en/topics/configuration
# Caution: Indentation through two spaces, not tabs
SSViewer:
  theme: 'simple'


Date:
  extensions:
    - NextYearDateExtension

NextYearDateExtension.php

<?php

class NextYearDateExtension extends Extension
{

	public function NextYear()
	{
		return (int)$this->owner->Year() + 1;
	}

}

template.ss

<p>Now: $Now</p> //current date

<p>Now.Year: $Now.Year</p> //current year

<p>Now.NextYear: $Now.NextYear</p> //next year

This gist shows how to easily add a NextYear() method to Silverstripe's Date class which you can access e.g. in templates.