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Detailed explanation of date comparison method in PHP and MYSQL
Detailed explanation of date comparison method in PHP and MYSQL
MYSQLWith dateFunctionnow(), this value returns not timestamp, but something like 2010-10- 1 12:12:12 is similar. PHP has a date function date(). date("Y-m-d", time()) returns the current time. If time() is simply used, the current time is returned. Time, for example, numbers such as 17
MYSQL date comparison
TO_DAYS(NOW()) - TO_DAYS(date_col) <= 30;
Our date_col must be in date and time format, not a timestamp,
mysql> SELECT FROM_UNIXTIME(875996580);
-> '1997-10-04 22:23:00'
day(FROM_UNIXTIME(1277709862)) This returns the number of days that have passed since a certain timestamp
Get the day: day(FROM_UNIXTIME(add_time))
Get the month: month(FROM_UNIXTIME(add_time))
Get the year: year(FROM_UNIXTIME(add_time))
Get the timestamp in sql text Then format it into day, month, and year: day(now()), month(now()), year(now())
where add_time is the field name, and the storage format is linuxtime Poke.
mysql> set @a = unix_timestamp();
Query OK, 0 rows affected (0.00 sec)
mysql> select @a;
+------ ------+
| @a |
+------------+
| 1154942084 |
+--------- ---+
1 row in set (0.00 sec)
mysql> select from_unixtime(@a);
+------------------- --+
| from_unixtime(@a) |
+---------------------+
| 2006-08-07 17: 14:44 |
+---------------------+
1 row in set (0.00 sec)
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