Ruby Date and Time

#!/usr/bin/ruby

time1 = Time.new
puts "Current time : " + time1.inspect

# Time.now를 사용할 수도 있다.
sleep 2
time2 = Time.new
puts "Current time : " + time2.inspect

$ ./date.rb 
Current time : 2012-10-27 12:01:02 +0900
Current time : 2012-10-27 12:01:04 +0900

#!/usr/bin/ruby

time = Time.new

# 시간 구성요소 다루기
puts "Current Time : " + time.inspect
puts time.year    # => Year of the date 
puts time.month   # => Month of the date (1 to 12)
puts time.day     # => Day of the date (1 to 31 )
puts time.wday    # => 0: Day of week: 0 is Sunday
puts time.yday    # => 365: Day of year
puts time.hour    # => 23: 24-hour clock
puts time.min     # => 59
puts time.sec     # => 59
puts time.usec    # => 999999: microseconds
puts time.zone    # => "UTC": timezone name

Current Time : 2012-10-27 12:03:37 +0900
2012
10
27
6
301
12
3
37
913113
KST

# 2012년 7월 8일, local time
puts Time.local(2012, 7, 8)
# 2012년 7월 8일 9시 10분, local time
puts Time.local(2012, 7, 8, 9, 10)

# 2012년 7월 8일 9시 10분, GMT 
puts Time.utc(2012, 7, 8, 9, 10)
puts Time.gm(2012, 7, 8, 9, 10)

2012-07-08 00:00:00 +0900
2012-07-08 09:10:00 +0900
2012-07-08 09:10:00 UTC
2012-07-08 09:10:00 UTC

[sec,min,hour,day,month,year,wday,yday,isdst,zone]

#!/usr/bin/ruby

time = Time.new

values = time.to_a
puts values

[31, 27, 14, 27, 10, 2012, 6, 301, false, KST]

time = Time.now.to_i
puts time
puts Time.at(time)
puts Time.now.to_f

1351315887
2012-10-27 14:31:27 +0900
1351315887.0634396

time = Time.new
time.zone       # => KST 
time.utc_offset # => UTC를 기준으로 차이나는 시간(초). 우리나라는 9 * 3600 == 32400 
time.zone       # => KST 
time.isdst      # => false: If UTC does not have DST.
time.utc?       # => true: if t is in UTC time zone
time.localtime  # Convert to local timezone.
time.gmtime     # Convert back to UTC.
time.getlocal   # Return a new Time object in local zone
time.getutc     # Return a new Time object in UTC