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Summary: in this tutorial, you will learn how to use the PostgreSQL
TO_TIMESTAMP()
function to convert a string to a timestamp based on a specified formatThe PostgreSQL
TO_TIMESTAMP()
function converts a string to a timestamp according to the specified format.Syntax
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The following illustrates the syntax of
TO_TIMESTAMP()
function:Some of the great features include: + Intellisense/SQL autocompletion. + Syntax highlighting with customizable themes (including dark). + Tabbed based interface for an optima. SQLPro Studio 1.0.420 February 28, 2019 SQLPro Studio is the premium database management tool for Postgres, MySQL, Microsoft Management Studio, and Oracle databases. SQLPro Studio offers you the possibility to work with multiple database types via the same user interface.The utility allows you to connect to MySQL, MSSQL, Oracle, and Postgres databases and can be used to run custom queries on multiple tables.
Arguments
The
TO_TIMESTAMP()
function requires two arguments:1)
timestamp
The
timestamp
is a string that represents a timestamp value in the format specified by format
.2)
format
The format for
timestamp
argument.To construct
format
strings, you use the following template patterns for formatting date and time values.Return Value
The PostgreSQL
TO_TIMESTAMP()
function returns a timestamp with time zone.Examples
The following statement uses the
TO_TIMESTAMP()
function to convert a string to a timestamp:Output:
In this example:
- YYYY is the four-digit year 2017
- MM is the month 03
- DD is the day 31
- HH is the hour 9
- MI is the minute 30
- SS is the second 20
Remarks
1) The
TO_TIMESTAMP()
function skips spaces in the input string unless the fixed format global option (FX
prefix) is used.This example uses multiple spaces in the input string:
The
TO_TIMESTAMP()
function just omits the spaces and returns the correct timestamp value:However, the following example returns an error:
Because the
FX
option instructs the TO_TIMESTAMP()
to accept the input string with one space only.2) The
TO_TIMESTAMP()
function validates the input string with minimal error checking. It will try to convert the input string to a valid timestamp as much as possible that sometimes yields unexpected results.The following example uses an invalid timestamp value:
It returns an error:
3) When converting a string to a timestamp, the
TO_TIMESTAMP()
function treats millisecond or microsecond as the seconds after the decimal point.The result is:
In this example, 2 is not 2 millisecond but 200. It means that:
and
returns the same result.
To get 2 milliseconds, you must use
01-01-2017 10:002
. In this case, 002
is interpreted as 0.002
seconds, which is equivalent to 2 milliseconds.4) If the year is less than four digits, the
TO_TIMESTAMP()
will adjust it to the nearest year e.g., 99 becomes 1999, 17 becomes 2017.The output is:
Consider the following example:
The nearest year of 16 is 2016, therefore, it returns the following result:
In this tutorial, you have learned how to use the PostgreSQL
TO_TIMESTAMP()
function to convert a string to a timestamp.SQLPro for MySQL 1.0.315
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