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Updated on 2023-10-25 GMT+08:00
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unix_timestamp

This function is used to convert a date value to a numeric date value in UNIX format.

The function returns the first ten digits of the timestamp in normal UNIX format.

Syntax

unix_timestamp(string timestamp, string pattern)

Parameters

Table 1 Parameters

Parameter

Mandatory

Type

Description

timestamp

No

DATE or STRING

Date to be converted

The following formats are supported:

  • yyyy-mm-dd
  • yyyy-mm-dd hh:mi:ss
  • yyyy-mm-dd hh:mi:ss.ff3

pattern

No

STRING

Format to be converted

If this parameter is left blank, the default format yyyy-mm-dd hh:mm:ss is used.

The value is a combination of the time unit (year, month, day, hour, minute, and second) and any character.

  • YYYY or yyyy indicates the year.
  • MM indicates the month.
  • mm indicates the minute.
  • dd indicates the day.
  • HH indicates the 24-hour clock.
  • hh indicates the 12-hour clock.
  • mi indicates the minute.
  • ss indicates the second.
  • SSS indicates the millisecond.

Return Values

The return value is of the BIGINT type.

  • If the value of timestamp is NULL, NULL is returned.
  • If both timestamp and pattern are left blank, the timestamp represented by the number of seconds since 1970-01-01 00:00:00 is returned.

Example Code

The value 1692149997 is returned.

select unix_timestamp('2023-08-16 09:39:57')

If the current system time is 2023-08-16 10:23:16, 1692152596 is returned.

select unix_timestamp();

The value 1692115200 (2023-08-16 00:00:00) is returned.

select unix_timestamp("2023-08-16 10:56:45", "yyyy-MM-dd");
Example table data 
select timestamp1, unix_timestamp(timestamp1) as date1_unix_timestamp, timestamp2, unix_timestamp(datetime1) as date2_unix_timestamp, timestamp3, unix_timestamp(timestamp1) as date3_unix_timestamp from database_t; output:
+------------+-------------------------+-----------------------+---------------------- --+------------------------------------+----------------------------+
| timestamp1| date1_unix_timestamp | timestamp2              | date2_unix_timestamp | timestamp3                                  | date3_unix_timestamp      |
+------------+-------------------------+-----------------------+-------------------------+------------------------------------+----------------------------+
| 2023-08-02 | 1690905600000           | 2023-08-02 11:09:14 | 1690945754793           | 2023-01-11 00:00:00.123456789 | 1673366400000                |
| 2023-08-03 | 1690992000000           | 2023-08-02 11:09:31 | 1690945771994           | 2023-02-11 00:00:00.123456789 | 1676044800000                |
| 2023-08-04 | 1691078400000           | 2023-08-02 11:09:41 | 1690945781270           | 2023-03-11 00:00:00.123456789 | 1678464000000                |
| 2023-08-05 | 1691164800000           | 2023-08-02 11:09:48 | 1690945788874           | 2023-04-11 00:00:00.123456789 | 1681142400000                |
| 2023-08-06 | 1691251200000           | 2023-08-02 11:09:59 | 1690945799099           | 2023-05-11 00:00:00.123456789 | 1683734400000                |
+------------+-------------------------+-----------------------+--------------------------+-----------------------------------+----------------------------+
Parent topic: Date Functions