sqlite 时间戳转时间

select datetime((timestamp/1000), 'unixepoch','localtime')  from messages where data != '' order by timestamp desc 

官方eg:

Examples
Compute the current date.

SELECT date('now');
Compute the last day of the current month.

SELECT date('now','start of month','+1 month','-1 day');
Compute the date and time given a unix timestamp 1092941466.

SELECT datetime(1092941466, 'unixepoch');
Compute the date and time given a unix timestamp 1092941466, and compensate for your local timezone.

SELECT datetime(1092941466, 'unixepoch', 'localtime');
Compute the current unix timestamp.

SELECT strftime('%s','now');
Compute the number of days since the signing of the US Declaration of Independence.

SELECT julianday('now') - julianday('1776-07-04');
Compute the number of seconds since a particular moment in 2004:

SELECT strftime('%s','now') - strftime('%s','2004-01-01 02:34:56');
Compute the date of the first Tuesday in October for the current year.

SELECT date('now','start of year','+9 months','weekday 2');
Compute the time since the unix epoch in seconds (like strftime('%s','now') except includes fractional part):

SELECT (julianday('now') - 2440587.5)*86400.0;