Some basic operations on Ruby processing time, And ruby processing basic operations

Some basic operations on Ruby processing time, And ruby processing basic operations

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 result:

Current Time: Mon Jun 02 12:02:39 -0700 2008
Current Time: Mon Jun 02 12:02:39 -0700 2008

Get the date and time of the component:

We can use the Time object to get the components of the date and time. The following example shows the same:

#! / usr / bin / ruby -w

time = Time.new

# Components of a Time
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

This will produce the following result:

Current Time: Mon Jun 02 12:03:08 -0700 2008
2008
6
2
1
154
12
3
8
247476
UTC

Time.utc, Time.gm and Time.local functions:

The two functions can be used to format dates in a standard format as follows:

# July 8, 2008
Time.local (2008, 7, 8)
# July 8, 2008, 09:10 am, local time
Time.local (2008, 7, 8, 9, 10)
# July 8, 2008, 09:10 UTC
Time.utc (2008, 7, 8, 9, 10)
# July 8, 2008, 09:10:11 GMT (same as UTC)
Time.gm (2008, 7, 8, 9, 10, 11)

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

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

Try the following:

#! / usr / bin / ruby -w

time = Time.new

values = time.to_a
p values

This will produce the following result:

[26, 10, 12, 2, 6, 2008, 1, 154, false, "MST"]

This array can be passed to Time.utc or Time.local functions 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 result:

Mon Jun 02 12:15:36 UTC 2008

Follow the way to get the internal representation (depending on the platform) seconds since epoch:

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

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

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

Time zone and daylight saving time:

You can use a Time object to get all the relevant time zone and daylight saving time as follows:

time = Time.new

# Here is 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 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

Format time and date:

There are various ways to format the date and time. Here is an example to illustrate a few:

#! / 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 result:

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

 Time arithmetic:

Simple arithmetic can be done in time as follows:

now = Time.now # Current time
puts now

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

future = now + 10 # 10 seconds from now Time + number => Time
puts future

diff = future-now # => 10 Time-Time => number of seconds
puts diff

This will produce the following result:

Thu Aug 01 20:57:05 -0700 2013
Thu Aug 01 20:56:55 -0700 2013
Thu Aug 01 20:57:15 -0700 2013
10.0