Timer

Get the execution time of the script or sql query.

PHP

• Start and stop a timer PHP - Stack Overflow
• Accurate way to measure execution times of php scripts - Stack Overflow

MySQL

Recording the time elapsed after the sql query was executed.

SELECT @timer := CURRENT_TIMESTAMP();
SELECT SLEEP(2); /* sleep 2 seconds for testing purpose */
SELECT 'custom message' AS 'action', CURRENT_TIMESTAMP() AS 'finish time', @timer AS 'start time', TIMEDIFF(CURRENT_TIMESTAMP(), @timer) AS 'time elapsed';

Linux command (BASH)

Linux console, macOS Terminal or Cygwin commands on Win

# start the timer
START=$(date +%s)

# sleep 2 seconds for testing purpose
sleep 2s

# stop the timer
END=$(date +%s)
DIFF=$(( $END - $START ))
printf "Elapsed time %02dh:%02dm:%02ds\n" $(($DIFF/3600)) $(($DIFF%3600/60)) $(($DIFF%60))

# expected result: 
#   Elapsed time 00h:00m:02s

Windows command (DOS)

# show the start time
prompt $d $t $_$P$G

# do something

# show the finish time
prompt $d $t $_$P$G

or ...

# recode the start time
set startTime=%time%

# do something

# show the start and finish time
echo Start Time: %startTime%
echo Finish Time: %time%

Python

Using time.time()

import time

# start the timer
start = time.time()

# do something

# stop the timer
end = time.time()
print("Elapsed time in seconds: ", end - start)

Java

Java.lang.System.currentTimeMillis()

# start the timer
long start_time = System.currentTimeMillis();

# stop the timer
System.out.println("\nElapsed time: " + (System.currentTimeMillis() - start_time) + " ms");

References