ActiveSupport、Numeric::Time

>> require "rubygems"
=> true
>> require "active_support"
=> true
>> Time.local(2008)
=> Tue Jan 01 00:00:00 +0900 2008
>> 1.seconds.since(Time.local(2008))
=> Tue Jan 01 00:00:01 +0900 2008
>> 1.second.since(Time.local(2008))
=> Tue Jan 01 00:00:01 +0900 2008
>> 1.minutes.since(Time.local(2008))
=> Tue Jan 01 00:01:00 +0900 2008
>> 1.minute.since(Time.local(2008))
=> Tue Jan 01 00:01:00 +0900 2008
>> 1.hours.since(Time.local(2008))
=> Tue Jan 01 01:00:00 +0900 2008
>> 1.hour.since(Time.local(2008))
=> Tue Jan 01 01:00:00 +0900 2008
>> 1.days.since(Time.local(2008))
=> Wed Jan 02 00:00:00 +0900 2008
>> 1.day.since(Time.local(2008))
=> Wed Jan 02 00:00:00 +0900 2008
>> 1.weeks.since(Time.local(2008))
=> Tue Jan 08 00:00:00 +0900 2008
>> 1.week.since(Time.local(2008))
=> Tue Jan 08 00:00:00 +0900 2008
>> 1.fortnights.since(Time.local(2008))
=> Tue Jan 15 00:00:00 +0900 2008
>> 1.fortnight.since(Time.local(2008))
=> Tue Jan 15 00:00:00 +0900 2008
>> 1.months.since(Time.local(2008))
=> Fri Feb 01 00:00:00 +0900 2008
>> 1.month.since(Time.local(2008))
=> Fri Feb 01 00:00:00 +0900 2008
>> 1.years.since(Time.local(2008))
=> Thu Jan 01 00:00:00 +0900 2009
>> 1.year.since(Time.local(2008))
=> Thu Jan 01 00:00:00 +0900 2009
>> 1.year.ago(Time.local(2008))
=> Mon Jan 01 00:00:00 +0900 2007
>> 1.year.until(Time.local(2008))
=> Mon Jan 01 00:00:00 +0900 2007
>> 1.year.from_now(Time.local(2008))
=> Thu Jan 01 00:00:00 +0900 2009
>> 1.year.from_now
=> Thu Oct 08 07:50:19 +0900 2009
>> 1.year.ago
=> Mon Oct 08 07:50:37 +0900 2007

引数があるときには、from_now という名前には、ちょっと違和感？