Select created, extract(epoch from created at time zone 'UTC') from my_table Select created, extract(epoch from date_trunc('milliseconds', created)) Queries: select created, extract(epoch from created) from my_table Insert into my_table(created) values(now()),('') Posting as an answer because it won't work as a comment.Ĭreate table my_table(created timestamp) See How do I get the current unix timestamp from PostgreSQL? for the source of my confusion. I've discovered this (see below) is basically wrong. Insert into my_table_2 (created) values (to_timestamp(1)) insert into my_table_2 (created) values (to_timestamp(0)) Syntax: CAST(constantcolumnexpression AS targettype). Is the difference a bug? I may be because of "Daylight saving times" at the moment?Īlso interesting while using to_timestamp() to insert timestamp 0 and 1. PostgreSQL supports the CAST operator to convert a value from one datatype to another datatype. For example, I'm in a time zone which is at UTC + 1, so, SELECT CURRENTTIMESTAMP AT TIME ZONE 'UTC' gives: 17:41:00.216647 which is 1 hour behind clock time because I'm on UTC + 1. This function takes two arguments: a string containing a date and time (in our example, the text ' 7/15:23:45 ') and the input format (in our example, ‘ YYYY/MM/DD/HH24:MI:ss ’). 2 Answers Sorted by: 5 To solve this, I looked here. Select created, extract(epoch from created) from my_table_2 Use the PostgreSQL function TOTIMESTAMP () when you want to convert a string containing date and time data to the timestamp data type. timestamptz is accepted as an abbreviation for timestamp with time zone this is a PostgreSQL extension. Insert into my_table_2 (created) values (now()), ('') The SQL standard requires that writing just timestamp be equivalent to timestamp without time zone, and PostgreSQL honors that behavior. Use the PostgreSQL function TOTIMESTAMP() when you want to convert a string containing date and time data to the timestamp data type. create table my_table_2(created timestamp with time zone) I do get the same difference as you (-3600), but if I use timestamp with time zone I can see that the "error" or difference is because '' gets time zone +01. How can I get the timestamp column in only milliseconds from PostgreSQL? I tend to use millis, but if you want to always use. 2ndQuadrant is now part of EDB Bringing together some of the world's top PostgreSQL experts. JDBC deals with timestamps as so all you need to do is convert your string into that. SELECT myformat(created) FROM mytable created Postgresql Interval, Date, Timestamp and Time Data Types - 2ndQuadrant PostgreSQL Declarations, Input, arithmetic, functions, constants and usage of PostgreSQL Interval, Date, Timestamp and Time data types. If I select colums, it has a nice and readable format per default: SELECT created FROM mytable īut I would like to get the timestamp in only milliseconds (as a Long). I have a column "created" with type timestamp without time zone default now() in a PostgreSQL database.
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