Get current date andtime:
The following is a simple example to get the current date and time:
This will produce the following results:
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Current Time : Mon Jun 02 12:02:39 -0700 2008Current 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 -wtime = Time.new# Components of a Timeputs "Current Time : " + time.inspectputs 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 Sundayputs time.yday # => 365: Day of yearputs time.hour # => 23: 24-hour clockputs time.min # => 59puts time.sec # => 59puts time.usec # => 999999: microsecondsputs time.zone # => "UTC": timezone name |
This will produce the following results:
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Current Time : Mon Jun 02 12:03:08 -0700 200820086211541238247476UTC |
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, 2008Time.local(2008, 7, 8) # July 8, 2008, 09:10am, local timeTime.local(2008, 7, 8, 9, 10) # July 8, 2008, 09:10 UTCTime.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 -wtime = Time.newvalues = time.to_ap 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 -wtime = Time.newvalues = time.to_aputs 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 epochtime = Time.now.to_i # Convert number of seconds into Time object.Time.at(time)# Returns second since epoch which includes microsecondstime = 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 interpretationtime.zone # => "UTC": return the timezonetime.utc_offset # => 0: UTC is 0 seconds offset from UTCtime.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 zonetime.localtime # Convert to local timezone.time.gmtime # Convert back to UTC.time.getlocal # Return a new Time object in local zonetime.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 -wtime = Time.newputs time.to_sputs time.ctimeputs time.localtimeputs 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 2008Mon Jun 2 12:35:19 2008Mon Jun 02 12:35:19 -0700 20082008-06-02 12:35:19 |
Time arithmetic:
You can do simple arithmetic in time as follows:
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now = Time.now # Current timeputs nowpast = now - 10 # 10 seconds ago. Time - number => Timeputs pastfuture = now + 10 # 10 seconds from now Time + number => Timeputs futurediff = future - now # => 10 Time - Time => number of secondsputs diff |
This will produce the following results:
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Thu Aug 01 20:57:05 -0700 2013Thu Aug 01 20:56:55 -0700 2013Thu Aug 01 20:57:15 -0700 201310.0 |