while methods have moved around this has been the implementation since ActiveRecord 3.0
# File lib/generators/delayed_job/next_migration_version.rb, line 5 def next_migration_number(dirname) next_migration_number = current_migration_number(dirname) + 1 if ActiveRecord::Base.timestamped_migrations [Time.now.utc.strftime("%Y%m%d%H%M%S"), "%.14d" % next_migration_number].max else "%.3d" % next_migration_number end end