System time
You are encouraged to solve this task according to the task description, using any language you may know.
Output the system time (any units will do as long as they are noted) either by a system command or one built into the language. The system time can be used for debugging, network information, random number seeds, or something as simple as program performance.
Ada
The following example displays a date-time stamp. The time zone value is the number of minutes offset from the prime meridian. <lang ada>with Ada.Calendar; use Ada.Calendar; with Ada.Calendar.Formatting; use Ada.Calendar.Formatting; with Ada.Calendar.Time_Zones; use Ada.Calendar.Time_Zones; with Ada.Text_Io; use Ada.Text_Io;
procedure System_Time is
Now : Time := Clock;
begin
Put_line(Image(Date => Now, Time_Zone => -7*60));
end System_Time;</lang>
Output:
2008-01-23 19:14:19
ALGOL 68
<lang algol>FORMAT time repr = $"year="4d,", month="2d,", day="2d,", hours="2d,", minutes="2d,", seconds="2d,", day of week="d,", daylight-saving-time flag="dl$; printf((time repr, local time)); printf((time repr, utc time))</lang>
Sample output:
year=2009, month=03, day=12, hours=11, minutes=53, seconds=32, day of week=5, daylight-saving-time flag=0 year=2009, month=03, day=12, hours=01, minutes=53, seconds=32, day of week=5, daylight-saving-time flag=0
AutoHotkey
<lang autohotkey>FormatTime, t MsgBox,% t</lang>
Sample output:
4:18 PM Saturday, May 30, 2009
AWK
$ awk 'BEGIN{print systime(),strftime()}'
1242401632 Fri May 15 17:33:52 2009
BASIC
This shows the system time in seconds since midnight.
PRINT TIMER
C
This probably isn't the best way to do this, but it works. It shows system time as "Www Mmm dd hh:mm:ss yyyy", where Www is the weekday, Mmm the month in letters, dd the day of the month, hh:mm:ss the time, and yyyy the year. <lang c>#include<time.h>
- include<stdio.h>
- include<stdlib.h>
int main(){
time_t my_time = time(NULL);
printf("%s", ctime(&my_time));
return 0;
}</lang>
C#
<lang csharp>Console.WriteLine(DateTime.Now);</lang>
Common Lisp
<lang lisp>(multiple-value-bind (second minute hour day month year) (get-decoded-time)
(format t "~4,'0D-~2,'0D-~2,'0D ~2,'0D:~2,'0D:~2,'0D" year month day hour minute second))</lang>
D
Clock.now.span in the example below returnes the time-span since 1 Jan 1 A.D. Days are used in the example, but lower units are available, with the lowest being nanoseconds (nanos field). <lang D> Stdout(Clock.now.span.days / 365).newline; </lang>
E
<lang e>println(timer.now())</lang>
The value is the number of milliseconds since 1970.
Forth
Forth's only standard access to the system timers is via DATE&TIME ( -- s m h D M Y ) and MS ( n -- ) which pauses the program for at least n milliseconds. Particular Forth implementations give different access to millisecond and microsecond timers:
[UNDEFINED] MS@ [IF] \ Win32Forth (rolls over daily) [DEFINED] ?MS [IF] ( -- ms ) : ms@ ?MS ; \ iForth [ELSE] [DEFINED] cputime [IF] ( -- Dusec ) : ms@ cputime d+ 1000 um/mod nip ; \ gforth: Anton Ertl [ELSE] [DEFINED] timer@ [IF] ( -- Dusec ) : ms@ timer@ >us 1000 um/mod nip ; \ bigForth [ELSE] [DEFINED] gettimeofday [IF] ( -- usec sec ) : ms@ gettimeofday 1000 MOD 1000 * SWAP 1000 / + ; \ PFE [ELSE] [DEFINED] counter [IF] : ms@ counter ; \ SwiftForth [ELSE] [DEFINED] GetTickCount [IF] : ms@ GetTickCount ; \ VFX Forth [ELSE] [DEFINED] MICROSECS [IF] : ms@ microsecs 1000 UM/MOD nip ; \ MacForth [THEN] [THEN] [THEN] [THEN] [THEN] [THEN] [THEN] MS@ . \ print millisecond counter
Fortran
In ISO Fortran 90 or later, use the SYSTEM_CLOCK intrinsic subroutine: <lang fortran>integer :: start, stop, rate real :: result
! optional 1st integer argument (COUNT) is current raw system clock counter value (not UNIX epoch millis!!) ! optional 2nd integer argument (COUNT_RATE) is clock cycles per second ! optional 3rd integer argument (COUNT_MAX) is maximum clock counter value call system_clock( start, rate )
result = do_timed_work()
call system_clock( stop )
print *, "elapsed time: ", real(stop - start) / real(rate)</lang>
In ISO Fortran 95 or later, use the CPU_TIME intrinsic subroutine: <lang fortran>real :: start, stop real :: result
! System clock value interpreted as floating point seconds call cpu_time( start )
result = do_timed_work()
call cpu_time( stop )
print *, "elapsed time: ", stop - start</lang>
Groovy
Solution (based on Java solution. <lang groovy>def nowMillis = new Date().time println 'Milliseconds since the start of the UNIX Epoch (Jan 1, 1970) == ' + nowMillis</lang> Output:
Milliseconds since the start of the UNIX Epoch (Jan 1, 1970) == 1243395159250
Haskell
<lang haskell>import System.Time import System.Locale
main = do ct <- getClockTime
print ct -- print default format, or
cal <- toCalendarTime ct
putStrLn $ formatCalendarTime defaultTimeLocale "%a %b %e %H:%M:%S %Y" cal</lang>
or with the time library: <lang haskell>import Data.Time import System.Locale
main = do zt <- getZonedTime
print zt -- print default format, or
putStrLn $ formatTime defaultTimeLocale "%a %b %e %H:%M:%S %Y" zt</lang>
Io
Date now println
Example output:
2008-08-26 00:15:52 EDT
J
The external verb 6!:0 returns a six-element floating-point array in which the elements correspond to year, month, day, hour, minute, and second. Fractional portion of second is given to thousandths.
6!:0 '' 2008 1 23 12 52 10.341
Java
This shows the system time in POSIX time. <lang java>import java.util.Date;
public class SystemTime{
public static void main(String[] args){
Date now = new Date();
System.out.println(now.getTime());
//System.currentTimeMillis() returns the same value
}
}</lang>
Other methods are available in the Date object such as: getDay(), getHours(), getMinutes(), getSeconds(), getYear(), etc.
JavaScript
<lang javascript>document.write(new Date());</lang>
Modula-3
<lang modula3>MODULE MyTime EXPORTS Main;
IMPORT IO, FmtTime, Time;
BEGIN
IO.Put("Current time: " & FmtTime.Long(Time.Now()) & "\n");
END MyTime.</lang>
Output:
Current time: Tue Dec 30 20:50:07 CST 2008
Objective-C
<lang ruby>NSLog(@"%@", [NSDate date]);</lang> or <lang ruby>NSLog(@"%@", [NSCalendarDate calendarDate]);</lang>
OCaml
<lang ocaml>#load "unix.cma";; open Unix;; let {tm_sec = sec;
tm_min = min;
tm_hour = hour;
tm_mday = mday;
tm_mon = mon;
tm_year = year;
tm_wday = wday;
tm_yday = yday;
tm_isdst = isdst} = localtime (time ());;
Printf.printf "%04d-%02d-%02d %02d:%02d:%02d\n" (year + 1900) (mon + 1) mday hour min sec;;</lang>
Perl
Simple localtime use in scalar context.
print scalar localtime, "\n";
Output:
Thu Jan 24 11:23:30 2008
localtime use in array context.
($sec, $min, $hour, $mday, $mon, $year, $wday, $yday, $isdst) = localtime;
printf("%04d-%02d-%02d %02d:%02d:%02d\n", $year + 1900, $mon + 1, $mday, $hour, $min, $sec);
Output:
2008-01-24 11:23:30
localtime use in array context with POSIX strftime.
use POSIX qw(strftime); $now_string = strftime "%a %b %e %H:%M:%S %Y", localtime; print "$now_string\n";
Output (with cs_CZ.UTF-8 locale):
Čt led 24 11:23:30 2008
Python
<lang python>import time print time.ctime()</lang>
Ruby
<lang ruby>puts Time.now</lang>
Scheme
<lang scheme>(use posix) (seconds->string (current-seconds))</lang> Output:
"Sat May 16 21:42:47 2009"
Standard ML
<lang sml>print (Date.toString (Date.fromTimeLocal (Time.now ())) ^ "\n")</lang>
Tcl
<lang tcl>puts [clock seconds]</lang>