Problem
Converting unix timestamp to datetime while retaining milliseconds.
Background
I am receiving unix timestamp in the following format:
- 1584049707
Then I am trying to send it by means of PHP to a column in MySQL that is datetime(3) using TO_TIMESTAMP(). I have also tried FROM_UNIXTIME(), but with the same results.
SQL
$sql = "
INSERT INTO assoc_table (timestart, timeend)
VALUES (TO_TIMESTAMP(:timestart), TO_TIMESTAMP(:timeend))
";
Result
- 2020-03-12 22:42:23.000
For some reason it does not register the milliseconds.
Desired outcome
- To get the milliseconds out of the unix timestamp and into the datetime column.
Epoch timestamps represent then number of seconds elapsed since January 1st, 1970; if you want fractional secons, it needs to have a fractional part... which is not the case with the input that you are given to MySQL; this is then reflected in the results that you are getting.
Given an epoch timestamp with a fractional part, from_unixtime() works as expected:
select from_unixtime(1584049707.123)
Returns:
2020-03-12 21:48:27.123
Note: datetime(3) is the relevant format to store such value.