Class: Axlsx::DateTimeConverter

Inherits:
Object
  • Object
show all
Defined in:
lib/axlsx/workbook/worksheet/date_time_converter.rb

Overview

The DateTimeConverter class converts both data and time types to their apprpriate excel serializations

Class Method Summary collapse

Class Method Details

.date_to_serial(date) ⇒ Numeric

The date_to_serial method converts Date objects to the equivelant excel serialized forms

Parameters:

  • date (Date) —

    the date to be serialized

Returns:

  • (Numeric) 


11
12
13
14
 
# File 'lib/axlsx/workbook/worksheet/date_time_converter.rb', line 11

def self.date_to_serial(date)
  epoch = Axlsx::Workbook::date1904 ? Date.new(1904) : Date.new(1899, 12, 30)
  (date-epoch).to_f
end

.time_to_serial(time) ⇒ Numeric

The time_to_serial methond converts a Time object its excel serialized form.

Parameters:

  • time (Time) —

    the time to be serialized

Returns:

  • (Numeric) 


19
20
21
22
23
24
25
26
27
 
# File 'lib/axlsx/workbook/worksheet/date_time_converter.rb', line 19

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 # Time.utc(1899, 12, 30).to_i
  epoch1904 = -2082844800 # Time.utc(1904, 1, 1).to_i
  seconds_per_day = 86400 # 60*60*24
  epoch = Axlsx::Workbook::date1904 ? epoch1904 : epoch1900
  (time.to_f - epoch)/seconds_per_day
end