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date为需要处理的参数(该参数是Unix 时间戳),可以是字段名,也可以直接是Unix 时间戳字符串
后面的 '%Y%m%d' 主要是将返回值格式化 例如: mysql>SELECT FROM_UNIXTIME( 1249488000, '%Y%m%d' ) ->20071120 mysql>SELECT FROM_UNIXTIME( 1249488000, '%Y年%m月%d' ) ->2007年11月20 UNIX_TIMESTAMP()是与之相对正好相反的时间函数 UNIX_TIMESTAMP(), UNIX_TIMESTAMP(date) 若无参数调用,则返回一个 Unix timestamp ('1970-01-01 00:00:00' GMT 之后的秒数) 作为无符号整数。若用date 来调用 UNIX_TIMESTAMP(),它会将参数值以'1970-01-01 00:00:00' GMT后的秒数的形式返回。date 可以是一个 DATE 字符串、一个 DATETIME字符串、一个 TIMESTAMP或一个当地时间的YYMMDD 或YYYMMDD格式的数字。 例如: mysql> SELECT UNIX_TIMESTAMP() ; (执行使得时间:2009-08-06 10:10:40) ->1249524739 mysql> SELECT UNIX_TIMESTAMP('2009-08-06') ; ->1249488000 [root@Mysql140 ~]# mysql -e "SELECT UNIX_TIMESTAMP('`date -I -d 'a day ago'`') ; " +------------------------------+ | UNIX_TIMESTAMP('2011-03-02') | +------------------------------+ | 1298995200 | +------------------------------+ 如何在不同编程语言中获取现在的Unix时间戳(Unix timestamp)? Java time JavaScript Math.round(new Date().getTime()/1000) getTime()返回数值的单位是毫秒 Microsoft .NET / C# epoch = (DateTime.Now.ToUniversalTime().Ticks - 621355968000000000) / 10000000 MySQL SELECT unix_timestamp(now()) Perl time PHP time() PostgreSQL SELECT extract(epoch FROM now()) Python 先 import time 然后 time.time() Ruby 获取Unix时间戳:Time.now 或 Time.new 显示Unix时间戳:Time.now.to_i SQL Server SELECT DATEDIFF(s, '1970-01-01 00:00:00', GETUTCDATE()) Unix / Linux date +%s VBScript / ASP DateDiff("s", "01/01/1970 00:00:00", Now()) 其他操作系统 (如果Perl被安装在系统中) 命令行状态:perl -e "print time" 如何在不同编程语言中实现Unix时间戳(Unix timestamp) → 普通时间? Java String date = new java.text.SimpleDateFormat("dd/MM/yyyy HH:mm:ss").format(new java.util.Date(Unix timestamp * 1000)) JavaScript 先 var unixTimestamp = new Date(Unix timestamp * 1000) 然后 commonTime = unixTimestamp.toLocaleString() Linux date -d @Unix timestamp MySQL from_unixtime(Unix timestamp) Perl 先 my $time = Unix timestamp 然后 my ($sec, $min, $hour, $day, $month, $year) = (localtime($time))[0,1,2,3,4,5,6] PHP date('r', Unix timestamp) PostgreSQL SELECT TIMESTAMP WITH TIME ZONE 'epoch' + Unix timestamp) * INTERVAL '1 second'; Python 先 import time 然后 time.gmtime(Unix timestamp) Ruby Time.at(Unix timestamp) SQL Server DATEADD(s, Unix timestamp, '1970-01-01 00:00:00') VBScript / ASP DateAdd("s", Unix timestamp, "01/01/1970 00:00:00") 其他操作系统 (如果Perl被安装在系统中) 命令行状态:perl -e "print scalar(localtime(Unix timestamp))" Example:查询member表中近三个月用户登录情况 Sql代码 select uid,userid,username,email,FROM_UNIXTIME(lastvisit,'%Y年%m月%d') from members where lastvisit between UNIX_TIMESTAMP('2010-01-06') and UNIX_TIMESTAMP('2010-04-06'); select uid,userid,username,email,FROM_UNIXTIME(lastvisit,'%Y年%m月%d') from members where lastvisit between UNIX_TIMESTAMP('2010-01-06') and UNIX_TIMESTAMP('2010-04-06'); |
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