Class: Stardate

Inherits:
Object
  • Object
show all
Defined in:
lib/stardate.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(t = Time.now) ⇒ Stardate

Returns a new instance of Stardate.



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# File 'lib/stardate.rb', line 63

def initialize(t = Time.now)
  case t.class.to_s
  when "Stardate"
    @stardate = t.stardate
    return
  when "Fixnum"
    @stardate = t.to_f
    return
  when "Float"
    @stardate = t
    return
  when "DateTime"
    datetime = t.to_time.utc
  when "Time"
    datetime = t.utc
  when "ActiveSupport::TimeWithZone"
    datetime = t.utc
  when "String"
    datetime = Time.parse(t).utc
  else
    raise "Unknown conversion: #{t.class}"
  end
  y0 = datetime.year
  t0 = Time.utc(y0).to_f
  t1 = Time.utc(y0 + 1).to_f
  @stardate = y0 + (datetime.to_f - t0)/(t1 - t0)
end

Instance Attribute Details

#stardate ⇒ Object

Returns the value of attribute stardate.



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# File 'lib/stardate.rb', line 7

def stardate
  @stardate
end

Class Method Details

.day ⇒ Object 



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# File 'lib/stardate.rb', line 29

def day
  1.0/365.2425
end

.fortnight ⇒ Object 



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# File 'lib/stardate.rb', line 37

def fortnight
  14.0/365.2425
end

.hour ⇒ Object 



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# File 'lib/stardate.rb', line 25

def hour
  1.0/8765.82
end

.lifespan ⇒ Object 



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# File 'lib/stardate.rb', line 45

def lifespan
  80.0
end

.millisecond ⇒ Object

Based on 365.2425 days/Gregorian year



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# File 'lib/stardate.rb', line 13

def millisecond
  1.0/31556952000.0
end

.minute ⇒ Object 



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# File 'lib/stardate.rb', line 21

def minute
  1.0/525949.2
end

.month ⇒ Object 



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# File 'lib/stardate.rb', line 41

def month
  1.0/12.0
end

.rename(filename, mode = :mtime) ⇒ Object 



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# File 'lib/stardate.rb', line 49

def rename(filename, mode = :mtime)
  case mode
  when :mtime
    datetime = File.mtime filename
  when :ctime
    datetime = File.ctime filename
  else
    raise "Unknown mode: #{mode}"
  end
  File.rename filename, datetime.to_stardate.to_filename(filename)
end

.second ⇒ Object 



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# File 'lib/stardate.rb', line 17

def second
  1.0/31556952.0
end

.week ⇒ Object 



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# File 'lib/stardate.rb', line 33

def week
  7.0/365.2425
end

Instance Method Details

#-(arg) ⇒ Object 



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# File 'lib/stardate.rb', line 91

def -(arg)
  StardateInterval.new arg, self
end

#inspect ⇒ Object 



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# File 'lib/stardate.rb', line 99

def inspect
  [
    to_s,
    ' [',
    to_rfc2822,
    ']'
  ].join
end

#short ⇒ Object 



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# File 'lib/stardate.rb', line 95

def short
  sprintf("%.3f", @stardate)
end

#to_datetime ⇒ Object 



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# File 'lib/stardate.rb', line 108

def to_datetime
  to_time.to_datetime
end

#to_dts ⇒ Object 



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# File 'lib/stardate.rb', line 112

def to_dts
  to_time.utc.strftime("%Y%m%d_%H%M%SZ")
end

#to_f ⇒ Object 



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# File 'lib/stardate.rb', line 116

def to_f
  @stardate
end

#to_femtoyears ⇒ Object 



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# File 'lib/stardate.rb', line 120

def to_femtoyears
  (@stardate * 1e15).to_i
end

#to_filename(filename) ⇒ Object 



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# File 'lib/stardate.rb', line 124

def to_filename(filename)
  ext = File.extname filename
  [
    filename.chomp(ext),
    '-',
    to_s,
    ext
  ].join
end

#to_iso8601 ⇒ Object

Round to the nearest second



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# File 'lib/stardate.rb', line 135

def to_iso8601
  Time.at(to_time.to_f + 0.5).iso8601
end

#to_localdate ⇒ Object 



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# File 'lib/stardate.rb', line 139

def to_localdate
  to_time.to_date
end

#to_rfc2822 ⇒ Object

Round to the nearest second



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# File 'lib/stardate.rb', line 144

def to_rfc2822
  Time.at(to_time.to_f + 0.5).rfc2822
end

#to_s ⇒ Object Also known as: canonical 



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# File 'lib/stardate.rb', line 148

def to_s
  sprintf("%.15f", @stardate)
end

#to_time ⇒ Object 



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# File 'lib/stardate.rb', line 153

def to_time
  y0 = @stardate.to_i
  t0 = Time.utc(y0).to_f
  t1 = Time.utc(y0+1).to_f
  Time.at(t0 + (@stardate-y0)*(t1-t0))
end

#to_utcdate ⇒ Object 



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# File 'lib/stardate.rb', line 160

def to_utcdate
  to_time.utc.to_date
end