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Python​

py
t = datetime.datetime.now()  # datetime class

PHP​

php
$dt = new DateTime(); // DateTime class

Bash​

bash
date

Ruby​

rb
t = Time.now  # Time class
rb
t = Time.new  # now でも new でも

PowerShell​

powershell
$dt = [DateTime]::Now

単に Get-Date で良いかも

C++​

gettimeofday() を使う

cpp
#include <time.h>
#include <sys/time.h>

double gettimeofday_sec()
{
    struct timeval tv;
    gettimeofday(&tv, NULL);
    return tv.tv_sec + (double)tv.tv_usec*1e-6;
}

C#​

cs
DateTime.Now

Java​

java
long a = System.currentTimeMillis();