Handling timestamp is incorrect? Or wrong examples just exists in documents?

[kachick]

Hi! I have created new ruby library for ULID manipulations as https://github.com/kachick/ruby-ulid 😄
I would like to import test cases from other implementations for robustness, then found this repository.

Some examples looks weird to me, are they actually correct example?

ulid-ruby/lib/ulid.rb

Lines 42 to 47 in 381daa7

	# @example Generate a ULID string for a given time
	# ULID.at(Time.at(1_000_000)) #=> 0009A0QS00SGEFTGMFFEAS6B9A
	#
	def self.at(at_time)
	Identifier.new(at_time).ulid
	end

In my gem

ULID.generate(moment: Time.at(1_000_000))
#=> ULID(1970-01-12 13:46:40.000 UTC: 0000XSNJG0WM2T5DT27HYBT8D4)

The timestamp handling looks correct from following result

Time.at(1_000_000, in: 'UTC')
#=> 1970-01-12 13:46:40 UTC

ulid-ruby/lib/ulid.rb

Lines 54 to 59 in 381daa7

	# @example Parse a ULID string and get a time value
	# ULID.time '0009A0QS00SGEFTGMFFEAS6B9A' #=> 1970-01-12 13:46:40 UTC
	#
	def self.time(ulid)
	Identifier.new(ulid).time.utc
	end

In my gem

ULID.parse('0009A0QS00SGEFTGMFFEAS6B9A').to_time
#=> 1970-04-26 17:46:40 UTC

Ensuring my result is same with https://github.com/oklog/ulid

$ ulid 0009A0QS00SGEFTGMFFEAS6B9A
Sun Apr 26 17:46:40 UTC 1970