How I can get yesterday's date?

For a date object you could use:

Date.yesterday

Or a time object:

1.day.ago

Or outside of rails:

Date.today.prev_day

After trying 1.day.ago and variants on it:

irb(main):005:0> 1.day.ago
NoMethodError: undefined method `day' for 1:Fixnum

if found that Date.today.prev_day works for me:

irb(main):016:0> Date.today.prev_day
=> #<Date: 2013-04-09 ((2456392j,0s,0n),+0s,2299161j)>

Time.now - (3600 * 24)   # or Time.now - 86400

require 'date'

Date.today.prev_day

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