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# frozen_string_literal: true
require "date"
module Axlsx
# The DateTimeConverter class converts both data and time types to their apprpriate Excel serializations
class DateTimeConverter
# The date_to_serial method converts Date objects to the equivelant Excel serialized forms
# @param [Date] date the date to be serialized
# @return [Numeric]
def self.date_to_serial(date)
epoch = Axlsx::Workbook.date1904 ? Date.new(1904) : Date.new(1899, 12, 30)
offset_date = date.respond_to?(:utc_offset) ? date + date.utc_offset.seconds : date
(offset_date - epoch).to_f
end
# The time_to_serial methond converts a Time object its Excel serialized form.
# @param [Time] time the time to be serialized
# @return [Numeric]
def self.time_to_serial(time)
# Using hardcoded offsets here as some operating systems will not except
# a 'negative' offset from the ruby epoch.
epoch1900 = -2209161600.0 # Time.utc(1899, 12, 30).to_i
epoch1904 = -2082844800.0 # Time.utc(1904, 1, 1).to_i
seconds_per_day = 86400.0 # 60*60*24
epoch = Axlsx::Workbook.date1904 ? epoch1904 : epoch1900
(time.utc_offset + time.to_f - epoch) / seconds_per_day
end
end
end
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