Postgresql timestamp cast8/12/2023 ![]() ![]() 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. If I select colums, it has a nice and readable format per default: SELECT created FROM mytable created - 10:40:28.876944 But I would like to get the timestamp in only milliseconds (as a Long). Similarly, tonumber is unnecessary for standard numeric representations. 1 What is the behavior of PostgreSQL when we cast a DATE to TIMESTAMP to TIMESTAMPTZ What time zone is used PostgreSQL server Client that run the query (Current session) postgresql Share Follow asked at 14:28 WebMaster 2,926 4 25 72 Really. For most standard date/time formats, simply casting the source string to the required data type works, and is much easier. I've discovered this (see below) is basically wrong. I have a column 'created' with type timestamp without time zone default now() in a PostgreSQL database. Formatting Functions Tip totimestamp and todate exist to handle input formats that cannot be converted by simple casting. Insert into my_table_2 (created) values (to_timestamp(1)) insert into my_table_2 (created) values (to_timestamp(0)) 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. Select created, extract(epoch from created) from my_table_2 Insert into my_table_2 (created) values (now()), ('') 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. 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. ![]() How can I get the timestamp column in only milliseconds from PostgreSQL? 2 Answers Sorted by: 5 To solve this, I looked here. SELECT myformat(created) FROM mytable created You can cast your timestamp to a date by suffixing it with ::date. To convert this to a timestamp without the timezone, you just add ::timestamptz. 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). Now this is a timestamp which also include the timezone offset which for my server is -5. Unfortunately cast() says its impossible. ) Id like to convert timestamp and date fields to intergers. I have a column "created" with type timestamp without time zone default now() in a PostgreSQL database. Hello, I hope its not a question for psql-novice. ![]()
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