How can I convert a datetime string to a UNIX timestamp in SQLite3?

Question

The documentation for SQLite3 datatypes says

the built-in Date And Time Functions of SQLite are capable of storing dates and times as TEXT, REAL, or INTEGER values

I want to use those functions to store INTEGER values. How do I do so? The documentation for SQLite3 datetime functions describes the types of the arguments to those functions, but says nothing of the return type. It seems that the return type is text:

sqlite> select typeOf(datetime('2014-12-12 12:12:12.000'));
text

This is not what I want -- I want an integer value representing that time as a UNIX timestamp. Even when I create a column of type integer and attempt to store a datetime(...) value in it, SQLite stores it as a text value in that integer column.

How do I force the datetime function and friends to return a UNIX timestamp, instead of a text value?

CL. · Accepted Answer · 2014-12-18 12:05:59Z

27

All the built-in date/time functions return strings.

To convert a string into a number, use CAST:

SELECT CAST(strftime('%s', 'now') AS INT);

answered Dec 18, 2014 at 12:05

CL.

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1 Comment

user1142902 Over a year ago

For mer worked:

SELECT CAST(strftime('%s', strftime('%Y-%m-%dT00:00:00+00:00', <your_datetime_column>), 'unixepoch') as datetime) FROM  <your_table>

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