How to get the date and time from timestamp in PostgreSQL select query?

Question

How to get the date and time only up to minutes, not seconds, from timestamp in PostgreSQL. I need date as well as time.

For example:

2000-12-16 12:21:13-05 

From this I need

2000-12-16 12:21 (no seconds and milliseconds only date and time in hours and minutes)

From a timestamp with time zone field, say update_time, how do I get date as well as time like above using PostgreSQL select query.

Please help me.

Answer 1

为了得到date从timestamp(或timestamptz)一个简单的铸件是最快的:

SELECT now()::date

无论哪种方式,您都可以date根据当地时区获得.

如果你想text在一定的格式,去与to_char()像提供@davek.

如果要将a的值截断(向下舍入)timestamp到一个时间单位,请使用date_trunc():

SELECT date_trunc('minute', now());

Answer 2

postgresql有很多日期时间函数:

请参阅此处的列表

http://www.postgresql.org/docs/9.1/static/functions-datetime.html

例如

SELECT EXTRACT(DAY FROM TIMESTAMP '2001-02-16 20:38:40');
Result: 16

对于格式化,您可以使用这些:

http://www.postgresql.org/docs/9.1/static/functions-formatting.html

例如

select to_char(current_timestamp, 'YYYY-MM-DD HH24:MI') ...

Answer 3

这应该足够了：

select now()::date, now()::time
    , pg_typeof(now()), pg_typeof(now()::date), pg_typeof(now()::time)