Presto SQL - Converting a date string to date format

Question

I\'m on presto and have a date formatted as varchar that looks like -

7/14/2015 8:22:39 AM

I\'ve looked the presto docs and tried various

Answer 1

You can also do something like this

date(cast('2016-03-22 15:19:34.0' as timestamp))

Answer 2

SQL 2003 standard defines the format as follows:

<unquoted timestamp string> ::= <unquoted date string> <space> <unquoted time string>
<date value> ::= <years value> <minus sign> <months value> <minus sign> <days value>
<time value> ::= <hours value> <colon> <minutes value> <colon> <seconds value>

There are some definitions in between that just link back to these, but in short YYYY-MM-DD HH:MM:SS with optional .mmm milliseconds is required to work on all SQL databases.