MySQL中from_unixtime与unix_timestamp差别

查阅官档：

FROM_UNIXTIME(unix_timestamp

),

FROM_UNIXTIME(unix_timestamp

,

format

)

Returns a representation of the

unix_timestamp

argument as a value in

'YYYY-MM-DD HH:MM:SS'

or

YYYYMMDDHHMMSS

format, depending on whether the function is used in a string or numeric context. The value is expressed in the current time zone.

unix_timestamp

is an internal timestamp value such as is produced by the

UNIX_TIMESTAMP()

function.

说明from_unixtime只是按照当前的时区，已指定的形式返回unix_timestamp值。

UNIX_TIMESTAMP()

,

UNIX_TIMESTAMP(date

)
If called with no argument, returns a Unix timestamp (seconds since

'1970-01-01 00:00:00'

UTC) as an unsigned integer. If

UNIX_TIMESTAMP()

is called with a

date

argument, it returns the value of the argument as seconds since

'1970-01-01 00:00:00'

UTC.

date

may be a

DATE

string, a

DATETIME

string, a

TIMESTAMP

, or a number in the format

YYMMDD

or

YYYYMMDD

. The server interprets

date

as a value in the current time zone and converts it to an internal value in UTC

不同点在与，unix_timestamp会受到本地时区的影响，有可能2个不同的timstamp对应一个unixtimestamp，而from_unixtime则是一一对应