diff --git a/lib/result_root.rb b/lib/result_root.rb
index 37fe3e396..493f766c8 100755
--- a/lib/result_root.rb
+++ b/lib/result_root.rb
@@ -2,6 +2,7 @@
 
 require 'time'
 
+require "#{LKP_SRC}/lib/string"
 require "#{LKP_SRC}/lib/common"
 require "#{LKP_SRC}/lib/property"
 require "#{LKP_SRC}/lib/yaml"
@@ -128,7 +129,7 @@ def each
 class Completion
   def initialize(line)
     fields = line.split
-    @time = Time.parse(fields[0..2].join(' '))
+    @time = fields[0..2].join(' ').to_time
     @_rt = MResultRoot.new fields[4]
     @status = fields.drop(4).join ' '
   end
diff --git a/lib/string.rb b/lib/string.rb
index 16f0eae71..f2f564c6b 100755
--- a/lib/string.rb
+++ b/lib/string.rb
@@ -1,4 +1,5 @@
 #!/usr/bin/env ruby
+require 'active_support/core_ext/string/conversions'
 
 REGEX_ANSI_COLOR = /\e\[([0-9;]+m|[mK])/.freeze
 
diff --git a/programs/igt/parse b/programs/igt/parse
index b60fc038f..68aa91f77 100755
--- a/programs/igt/parse
+++ b/programs/igt/parse
@@ -13,7 +13,7 @@ subtest_name = nil
 has_dynamic_subtest = false
 
 def valid_datetime?(datetime_str)
-  Time.parse(datetime_str)
+  datetime_str.to_time
 rescue StandardError
   false
 end
diff --git a/programs/iostat/parse b/programs/iostat/parse
index 93d073437..7a61440ad 100755
--- a/programs/iostat/parse
+++ b/programs/iostat/parse
@@ -7,8 +7,10 @@
 # Device:         rrqm/s   wrqm/s     r/s     w/s    rkB/s    wkB/s avgrq-sz avgqu-sz   await r_await w_await  svctm  %util
 # sda               0.15    12.76    3.02    9.81    63.05   126.27    29.51     0.16   12.72    3.96   15.42   1.55   1.99
 # sdd               0.09    34.01    8.43   20.57   189.15   750.68    64.80     0.79   27.07    1.31   37.63   0.45   1.31
+LKP_SRC = ENV['LKP_SRC'] || File.dirname(File.dirname(File.dirname(File.realpath($PROGRAM_NAME))))
 
 require 'time'
+require "#{LKP_SRC}/lib/string"
 
 def normalize_key(key)
   key.sub('%', '')
@@ -45,7 +47,7 @@ while (line = $stdin.gets)
   case line
   when /^[0-9T:+-]{24}$/ # "2013-04-02T13:58:40+0800", by 'S_TIME_FORMAT=ISO isotat -t'
     time = line.chomp('\n')
-    puts "time: #{Time.parse(time).to_i}"
+    puts "time: #{time.to_time.to_i}"
   when /^avg-cpu:/
     extract_avg_cpu line
   when /^Device:/
diff --git a/programs/mpstat/parse b/programs/mpstat/parse
index 35fa50533..4b49df2ba 100755
--- a/programs/mpstat/parse
+++ b/programs/mpstat/parse
@@ -5,6 +5,7 @@ require 'time'
 require 'json'
 require 'fileutils'
 require "#{LKP_SRC}/lib/log"
+require "#{LKP_SRC}/lib/string"
 
 # The below is an example of mpstat output, read it then parse it into hash data.
 # {"sysstat": {
@@ -170,7 +171,7 @@ mpstat_hash['sysstat']['hosts'][0]['statistics'].each do |item|
     elsif k == 'timestamp'
       # Append UTC to timestamp to fix the timezone as no timezone is provided by
       # mpstat, otherwise the parsed result is related to the timezone of local system.
-      time = Time.parse([data, v, 'UTC'].join(' ')).to_i
+      time = [data, v, 'UTC'].join(' ').to_time.to_i
       results['time'] = time
     end
   end
diff --git a/programs/sar/parse b/programs/sar/parse
index 200aaa170..675ef69b7 100755
--- a/programs/sar/parse
+++ b/programs/sar/parse
@@ -1,8 +1,9 @@
 #!/usr/bin/env ruby
+LKP_SRC = ENV['LKP_SRC'] || File.dirname(File.dirname(File.dirname(File.realpath($PROGRAM_NAME))))
 
 require 'time'
 require 'json'
-
+require "#{LKP_SRC}/lib/string"
 RESULT_ROOT = ENV['RESULT_ROOT']
 
 # The below is part of the sar json file, read it then parse it into hash data.
@@ -96,7 +97,7 @@ sar_hash['sysstat']['hosts'][0]['statistics'].each do |item|
         elsif v_.instance_of?(Hash)
           get_hash_result k_, v_, results
         elsif k == 'timestamp'
-          timestamp = Time.parse([v['data'], v['time']].join(' ')).to_i
+          timestamp = [v['data'], v['time']].join(' ').to_time.to_i
           results['timestamp'] = timestamp
         else
           results["#{k}.#{k_}"] = v_
diff --git a/programs/unixbench/parse b/programs/unixbench/parse
index 3c5bb63f9..d9249e433 100755
--- a/programs/unixbench/parse
+++ b/programs/unixbench/parse
@@ -15,8 +15,8 @@ while (line = $stdin.gets)
   when /^Benchmark Run: .+ (\d+:\d+:\d+) - (\d+:\d+:\d+)$/
     # Benchmark Run: Tue Jan 01 2019 15:48:24 - 15:56:36
     # We only care about the difference value between end time and start time
-    start_time = Time.parse($1).to_f
-    end_time = Time.parse($2).to_f
+    start_time = $1.to_time.to_f
+    end_time = $2.to_time.to_f
     duration = if end_time > start_time
                  end_time - start_time
                else
diff --git a/programs/vmstat/parse b/programs/vmstat/parse
index c16420de0..a3ec10373 100755
--- a/programs/vmstat/parse
+++ b/programs/vmstat/parse
@@ -1,7 +1,7 @@
 #!/usr/bin/env ruby
-
+LKP_SRC = ENV['LKP_SRC'] || File.dirname(File.dirname(File.dirname(File.realpath($PROGRAM_NAME))))
 require 'time'
-
+require "#{LKP_SRC}/lib/string"
 # procs -----------memory---------- ---swap-- -----io---- -system-- ------cpu----- -----timestamp-----
 #  r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa st                 PST
 #  2  0      0 224636  33636 6760228    0    0    54   141  129   23  1  1 98  0  0 2015-01-11 20:18:35
@@ -29,7 +29,7 @@ while (line = $stdin.gets)
 
   data = line.split
   if data.size == keys.size + 1 # has "date time" in end of line
-    time = Time.parse(data.pop(2).join(' ')).to_i
+    time = data.pop(2).join(' ').to_time.to_i
     data.push time
     show_record keys, data
   elsif data.size == keys.size - 1  # no timestamp in old versions of vmstat