MySQL: Timezone issue with unix_timestamp()

This MySQL query:
SELECT unix_timestamp('2015-10-01 00:00:00')

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1443672000 which is at 4:00 am
however I want it to return
1443657600 which is at midnight.

The problem is likely caused by a timezone issue, where a Unix Timestamp should always be in UTC time however MySQL is doing the calculation based on the time zone of the server.
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Add the timezone to the string
Unix_timestamp('2015-10-01 00:00:00 -0400')

Or use the TIMezone in the query, GMT/UTC is presumed if absent.
See also the conver_tz option that includes the timezone .......
Ref the date/time command from prior
skijAuthor Commented:
Thank you but I am still confused.  Your first idea of adding the timezone offset to the string by hardcoding  -0400 is not an option for me because this needs to work reliably on any server independently of the timezone offset.  I don't want to have to convert the timezone or specify the timezone for the same reason.
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Given that restriction, you have to then take into account that unix_timestamp presumes GMT/UTC while the output converting the unix timestamp then should use a non local time converter.

Please the date/time function to deal with timezone handling.

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Dave BaldwinFixer of ProblemsCommented:
Here is the man page   Here is info on setting the time zone   Note that you probably have to be 'root' to do that since it appears that it sets it for the entire server.
skijAuthor Commented:
Thanks.  I will use this:
SELECT UNIX_TIMESTAMP(CONVERT_TZ('2015-10-01 00:00:00', '+00:00', @@global.time_zone))

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