Some basic operations of processing time in Ruby _ruby topics

Get the current date and time:

The following is a simple example to get the current date and time:

#!/usr/bin/ruby-w

time1 = time.new

puts "current time:" + time1.inspect

# Time.now is a synonym:
time2 = Time.now
puts "current time:" + time2.inspect

This will produce the following results:

Current Time:mon June 12:02:39-0700 2008 Current
Time:mon June 02 12:02:39-0700 2008

Get the date and time of the component:

We can use the time object to get the various parts of the date and times. The following example shows the same:

#!/usr/bin/ruby-w time

= time.new

# components ' A time
puts ' current time: ' + time.inspect
puts time. Year  # => year of the date 
puts Time.month  # => month of the date (1 to)
puts Time.day   # => ; Day of the date (1 to)
puts Time.wday  # => 0:day of week:0 is Sunday
puts Time.yday  # => 3 65:day of year
puts Time.hour  # => 23:24-hour clock puts
time.min   # =>
-puts 19/># =>
puts Time.usec # => 999999:microseconds puts Time.zone  # => "UTC": TimeZone Name

This will produce the following results:

Current Time:mon June 12:03:08-0700 2008
2008
6
2
1
154
3
8
247476
UTC

TIME.UTC,TIME.GM and Time.local functions:

These two functions can be used in a standard format to format the date as follows:

# July 8, 2008
time.local (2008, 7, 8) 
# July 8, 2008, 09:10am, local time
time.local (2008, 7, 8, 9, ten)  
# July 8, 2008, 09:10 UTC
TIME.UTC (2008, 7, 8, 9, ten) 
# July 8, 2008, 09:10:11 GMT (same as UTC)
TIME.GM (2008, 7 , 8, 9, 10, 11) 

The following example, in an array to get all the components in the following format:

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

Try these actions:

#!/usr/bin/ruby-w time

= time.new

values = time.to_a
p values

This will produce the following results:

[2, 6, 2008, 1, 154, False, "MST"]

This array can be passed to the TIME.UTC or time.local function to get different date formats as follows:

#!/usr/bin/ruby-w time

= time.new

values = time.to_a
puts TIME.UTC (*values)

This will produce the following results:

Mon June 12:15:36 UTC 2008

followed by the way to get the number of seconds since the internal representation (platform dependent) calendar:

# Returns number of seconds since epoch time
= Time.now.to_i 

# Convert number of seconds to time object.
time.at (Time)

# Returns second since epoch which includes microseconds time
= Time.now.to_f

TimeZone and daylight Saving time:

You can use a time object to get all of the relevant information about the timezone and daylight as follows:

Time = time.new

# are
the interpretation Time.zone    # => "UTC": Return the timezone
Time.utc_offset # => 0:UTC is 0 seconds offset from UTC
time.zone    # => ' PST ' (or whatever your timezone is)
TIME.ISDST   # => False:if UTC does not have DST.
Time.utc?    # => True:if T in UTC time zone
time.localtime # Convert to local timezone.
Time.gmtime   # Convert back to UTC.
Time.getlocal  # Return a new Time object in the local zone
TIME.GETUTC # return   A new time object in UTC

Format Time and Date:

There are a variety of ways to format dates and times. Here is an example that illustrates several:

#!/usr/bin/ruby-w time
= time.new

puts time.to_s
puts
Time.ctime puts Time.localtime puts Time.strftime ("%y-%m-%d%h:%m:%s")

This will produce the following results:

Mon June 12:35:19-0700 2008
Mon June 2 12:35:19 2008
Mon June 12:35:19-0700 2008
2008-06-02 12:35:19

Time Arithmetic:

Can do simple sums in time as follows:

now = Time.now      # "Current
" puts now

past = now-10     # seconds ago. Time-number => time
puts past

future = Now + ten seconds from now time    + number => time
PU TS Future

diff = future-now   # => time-time => number of seconds
puts diff

This will produce the following results:

Thu Aug 20:57:05-0700 2013
Thu Aug-20:56:55-0700 2013 Thu
Aug-20:57:15-0700 2013
10.0