- Categories:
TO_TIME , TIME¶
Converts an input expression into a time. If input is NULL, returns NULL.
- See also:
Syntax¶
TO_TIME( <string_expr> [, <format> ] )
TO_TIME( <timestamp_expr> )
TO_TIME( '<integer>' )
TO_TIME( <variant_expr> )
TIME( <string_expr> )
TIME( <timestamp_expr> )
TIME( '<integer>' )
TIME( <variant_expr> )
Arguments¶
Required:
string_expr
ortimestamp_expr
orvariant_expr
orinteger
Expression to be converted into a time:
For
string_expr
, the result of converting the string to a time.For
timestamp_expr
, the time portion of the input value.For
'integer'
(a string containing an integer), the integer is treated as a number of seconds, milliseconds, microseconds, or nanoseconds after the start of the Unix epoch. See the Usage Notes below.For this timestamp, the function gets the number of seconds after the start of the Unix epoch. The function performs a modulo operation to get the remainder from dividing this number by the number of seconds in a day (
86400
):number_of_seconds % 86400
The function interprets this remainder as the number of seconds after midnight.
For example, suppose that the value is
31536002789
.Based on the magnitude of this value, the function uses milliseconds as the unit of time and determines that the value represents
1971-01-01 00:00:02.789
.The function gets the number of seconds after the Unix epoch for this value (
31536002
).The function gets the remainder from dividing that number by the number of seconds in a day (
31536002 % 86400
).The function uses the remainder (
2
) as the number of seconds after midnight. The resulting time is00:00:02
.
Note
The use of quoted integers as inputs is deprecated.
For
variant_expr
:If the variant contains a string in TIME format (‘HH:MI:SS’), a string conversion is performed.
If the variant contains a string in INTEGER format, a string conversion is performed and the value is treated as the number of seconds since midnight (modulus 86400 if necessary).
If the variant contains JSON null value, the output is NULL.
For all other values, a conversion error is generated.
Optional:
format
Time format specifier for
string_expr
or AUTO, which specifies that Snowflake should automatically detect the format to use. For more information, see Date and Time Formats in Conversion Functions.Default: current value of the TIME_INPUT_FORMAT session parameter (usually AUTO)
Returns¶
The data type of the returned value is TIME
.
Usage Notes¶
If the format of the input parameter is a string that contains an integer, the unit of measurement for the value (seconds, microseconds, milliseconds, or nanoseconds) is determined as follows:
After the string is converted to an integer, the integer is treated as a number of seconds, milliseconds, microseconds, or nanoseconds after the start of the Unix epoch (1970-01-01 00:00:00.000000000 UTC).
If the integer is less than 31536000000 (the number of milliseconds in a year), then the value is treated as a number of seconds.
If the value is greater than or equal to 31536000000 and less than 31536000000000, then the value is treated as milliseconds.
If the value is greater than or equal to 31536000000000 and less than 31536000000000000, then the value is treated as microseconds.
If the value is greater than or equal to 31536000000000000, then the value is treated as nanoseconds.
Caution
Currently, negative values are always treated as seconds. For example, -31536000000000000000 is treated as a number of seconds before the year 1970, although its scale implies that it is intended to be used as nanoseconds.
This behavior might change in the future.
Note
Deprecation Warning: Future versions of Snowflake might automatically interpret stringified integer values as seconds, rather than as milliseconds, microseconds, or nanoseconds. Snowflake recommends that you call TO_DATE, TO_TIME, or TO_TIMESTAMP with strings that contain integers only when those integers are intended to be interpreted as seconds.
If more than one row is evaluated (for example, if the input is the column name of a table that contains more than one row), each value is examined independently to determine if the value represents seconds, milliseconds, microseconds, or nanoseconds.
Unlike the TO_TIME function, the TIME function does not support the optional
format
parameter.
Examples¶
These examples demonstrate the TO_TIME
function.
SELECT TO_TIME('13:30:00'), TIME('13:30:00'); +---------------------+------------------+ | TO_TIME('13:30:00') | TIME('13:30:00') | |---------------------+------------------| | 13:30:00 | 13:30:00 | +---------------------+------------------+SELECT TO_TIME('13:30:00.000'), TIME('13:30:00.000'); +-------------------------+----------------------+ | TO_TIME('13:30:00.000') | TIME('13:30:00.000') | |-------------------------+----------------------| | 13:30:00 | 13:30:00 | +-------------------------+----------------------+
This example shows how to use the TO_TIME
function to process field separators
other than the default colons (this example uses the period character as
the separator between hours and minutes, and between minutes and seconds):
SELECT TO_TIME('11.15.00', 'HH24.MI.SS'); +-----------------------------------+ | TO_TIME('11.15.00', 'HH24.MI.SS') | |-----------------------------------| | 11:15:00 | +-----------------------------------+
This example demonstrates how the TO_TIME
function interprets a string containing an integer value:
CREATE TABLE demo1_time ( description VARCHAR, value VARCHAR -- yes, string rather than bigint ); +----------------------------------------+ | status | |----------------------------------------| | Table DEMO1_TIME successfully created. | +----------------------------------------+ INSERT INTO demo1_time (description, value) VALUES ('Seconds', '31536001'), ('Milliseconds', '31536002400'), ('Microseconds', '31536003600000'), ('Nanoseconds', '31536004900000000') ; +-------------------------+ | number of rows inserted | |-------------------------| | 4 | +-------------------------+SELECT description, value, TO_TIMESTAMP(value), TO_TIME(value) FROM demo1_time ORDER BY value ; +--------------+-------------------+-------------------------+----------------+ | DESCRIPTION | VALUE | TO_TIMESTAMP(VALUE) | TO_TIME(VALUE) | |--------------+-------------------+-------------------------+----------------| | Seconds | 31536001 | 1971-01-01 00:00:01.000 | 00:00:01 | | Milliseconds | 31536002400 | 1971-01-01 00:00:02.400 | 00:00:02 | | Microseconds | 31536003600000 | 1971-01-01 00:00:03.600 | 00:00:03 | | Nanoseconds | 31536004900000000 | 1971-01-01 00:00:04.900 | 00:00:04 | +--------------+-------------------+-------------------------+----------------+