DB2数据库中时间函总结

本文将为您详细介绍DB2数据库中时间函数的分类介绍，供您参考，希望能对您有所帮助。

DB2时间函数简单总结：

代码
–获取当前日期：

select current date from sysibm.sysdummy1;
values current date;

–获取当前日期
select current time from sysibm.sysdummy1;
values current time;
–获取当前时间戳
select current timestamp from sysibm.sysdummy1;
values current timestamp;

–要使当前时间或当前时间戳记调整到 GMT/CUT，则把当前的时间或时间戳记减去当前时区寄存器：

values current time -current timezone;
values current timestamp -current timezone;

–获取当前年份

values year(current timestamp);

–获取当前月
values month(current timestamp);#p#

–获取当前日
values day(current timestamp);

–获取当前时
values hour(current timestamp);

–获取分钟
values minute(current timestamp);

–获取秒
values second(current timestamp);

–获取毫秒
values microsecond(current timestamp);

–从时间戳记单独抽取出日期和时间

values date(current timestamp);
values VARCHAR_FORMAT(current TIMESTAMP,”yyyy-mm-dd”);
values char(current date);
values time(current timestamp);

–执行日期和时间的计算

values current date+1 year;   
values current date+3 years+2 months +15 days;
values current time +5 hours -3 minutes +10 seconds;

–计算两个日期之间的天数#p#

values days(current date)- days(date(“2010-02-20”));

–时间和日期换成字符串

values char(current date);
values char(current time);

–要将字符串转换成日期或时间值

values timestamp(“2010-03-09-22.43.00.000000”);
values timestamp(“2010-03-09 22:44:36”);
values date(“2010-03-09”);
values date(“03/09/2010”);
values time(“22:45:27”);
values time(“22.45.27”);

–计算两个时间戳记之间的时差：

–秒的小数部分为单位
values timestampdiff(1,char(current timestamp – timestamp(“2010-01-01-00.00.00”)));
–秒为单位
values timestampdiff(2,char(current timestamp – timestamp(“2010-01-01-00.00.00”)));
–分为单位
values timestampdiff(4,char(current timestamp – timestamp(“2010-01-01-00.00.00”)));
–小时为单位
values timestampdiff(8,char(current timestamp – timestamp(“2010-01-01-00.00.00”)));
–天为单位
values timestampdiff(16,char(current timestamp – timestamp(“2010-01-01-00.00.00”)));
–周为单位
values timestampdiff(32,char(current timestamp – timestamp(“2010-01-01-00.00.00”)));
–月为单位
values timestampdiff(64,char(current timestamp – timestamp(“2010-01-01-00.00.00”)));
–季度为单位
values timestampdiff(128,char(current timestamp – timestamp(“2010-01-01-00.00.00”)));
–年为单位
values timestampdiff(256,char(current timestamp – timestamp(“2010-01-01-00.00.00”)));