转自：http://www.sqlite.org/lang_datefunc.html

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.

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:

Compute the date of the first Tuesday in October for the current year.

Compute the time since the unix epoch in seconds (like strftime('%s','now') except includes fractional part):

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