## 2.2.0

- Added support for Arrays and Hashes

## 2.1.1

- Fixed format option with multiple groups
- Better error message if time zone support is missing for MySQL

## 2.1.0

- Added last option
- Added format option

## 2.0.4

- Added multiple groups
- Added order
- Subsequent methods no longer modify relation

## 2.0.3

- Implemented respond_to?

## 2.0.2

- where, joins, and includes no longer need to be before the group_by method

## 2.0.1

- Use time zone instead of UTC for results

## 2.0.0

- Returns entire series by default
- Added day_start option
- Better interface

## 1.0.5

- Added global time_zone option

## 1.0.4

- Added global week_start option
- Fixed bug with NULL values and series

## 1.0.3

- Fixed deprecation warning when used with will_paginate
- Fixed bug with DateTime series

## 1.0.2

- Added :start option for custom week start for group_by_week

## 1.0.1

- Fixed series for Rails < 3.2 and MySQL

## 1.0.0

- First major release