Some basic operations of processing time in Ruby

Time:2022-5-16

Get current date andtime:

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

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#!/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:

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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 date and time. The following example shows the same:

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#!/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 results:

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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 function:

You can use these two functions to format the date in a standard format as follows:

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# July 8, 2008
Time.local(2008, 7, 8)
# July 8, 2008, 09:10am, 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 obtains all components in an array in the following format:

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

Try the following:

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#!/usr/bin/ruby -w
 
time = Time.new
 
values = time.to_a
p values

This will produce the following results:

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

This array can be passed to time UTC or time The local function obtains different date formats as follows:

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#!/usr/bin/ruby -w
 
time = Time.new
 
values = time.to_a
puts Time.utc(*values)

This will produce the following results:

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Mon Jun 02 12:15:36 UTC 2008

To obtain the number of seconds since the epoch of the internal representation (platform dependent):

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# 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 obtain all relevant information. The time zone and summer are as follows:

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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 dates and times. The following is an example to illustrate several:

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#!/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:

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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:

You can do simple arithmetic in time as follows:

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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 results:

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