How to format the date in PHP and how to convert the PHP time format?

The date(format,time) function has 2 parameters to format the output of the date, the first format is the format you want to be in the form y m d is the month, day and year, like h:i:s is the hour:

Minutes: seconds, the upper and lower case of the first letter represents different time systems, there are 12 hours and 24 hours. The second parameter time is the time that needs to be formatted, which is the current time by default, or it may be the past time or future time that you save in the database.

For more specific instructions, see the date function of the library for more details. The strtotime() function converts the time of the text into a timestamp. How to use it?

The second argument of the date() function is a timestamp, which means that the time you want to output and save in the database may be a text string, which needs to be converted to a timestamp by the strtotime() function and sent to the date() function for formatting output. The standard instance is date("d js f y ",strtotime($dateposted))。

dateposted is a text time that I save in the database. In this way, the form can be perfectly output.

date('y-m-d'This is the date of acquisition.

time() to get the timestamp.

strtotime This is converted to a timestamp.

The specific how to use the manual can be found.

strtotime

date has a lot of functions about time.

Search for it.

php Date Format Conversion Summary:

Convert the current time to yyyy-mm-dd format string, and then convert it to date format, which goes around in a circle.

echo strtotime(date('y-m-d',time())' 00:00:00');

Converts characters in the GNU date input format to time.

echo strtotime('now');

Standard strings are converted to time.

t = '2012-9-10 15:18:06';

time = strtotime($t);

Convert time to date character yyyymmdd and then to integer format.

d = intval(date('ymd',$time));

header("content-type: text/html; charset=utf-8");

txdate = '2016-06-16';

datetime1 = strtotime($txdate);int 1466028000 parses the English text datetime to a UNIX timestamp:

datetime2= date("y-m-d h:i:s",$datetime1); //string '2016-06-16 00:00:00'

length=19) date() function formatting the timestamp to a more readable date and time.

Splicing today's last time 2016-06-16 23:59:59

datetime= date("y-m-d h:i:s",strtotime(date("y-m-d",strtotime($datetime2)).

23 hours 59 minutes 59 seconds "));//string '2016-06-16 23:59:59' (length=19)

sql = select * form `vvt_user` where userid = 100 and date_time >= $datetime2 and date_time <= $datetime;?>