PHP time operations

1. Calculate the data issue between the current time and the same time period of yesterday

This problem requires you to know the current time and the time after the current time minus 24

Method 1: Use time () and date ()

For example:

$ Time = time ();

$ Tomorrow = time () + 24*3600; // Same time tomorrow

Echo '4: '. date ('y: m: d H: I: s', $ tomorrow );

$ Yestoday = time () + 24*3600; // same time as yesterday

Echo '5: '. date ('y: m: d H: I: s', $ yestoday );

Method 2: Write the functions DateDiff () or DateSubstact () in other languages by yourself ()

For example:

Function DateDiff ($ interval, $ date1, $ date2)

{// Obtain the number of seconds between two dates

$ Timedifference = strtotime ($ date2)-strtotime ($ date1 );

Switch ($ interval ){

Case "w": $ retval = bcdiv ($ timedifference, 604800); break;

Case "d": $ retval = bcdiv ($ timedifference, 86400); break;

Case "h": $ retval = bcdiv ($ timedifference, 3600); break;

Case "n": $ retval = bcdiv ($ timedifference, 60); break;

Case "s": $ retval = $ timedifference; break;

}

Return $ retval;

}

Function DateAdd ($ interval, $ number, $ date)

{

$ Date_time_array = getdate ($ date );

$ Hours = $ date_time_array ["hours"];

$ Minutes = $ date_time_array ["minutes"];

$ Seconds = $ date_time_array ["seconds"];

$ Month = $ date_time_array ["mon"];

$ Day = $ date_time_array ["mday"];

$ Year = $ date_time_array ["year"];

Switch ($ interval ){

Case "yyyy": $ year + = $ number; break;

Case "q": $ month + = ($ number * 3); break;

Case "m": $ month + = $ number; break;

Case "y ":

Case "d ":

Case "w": $ day + = $ number; break;

Case "ww": $ day + = ($ number * 7); break;

Case "h": $ hours + = $ number; break;

Case "n": $ minutes + = $ number; break;

Case "s": $ seconds + = $ number; break;

}

$ Timestamp = mktime ($ hours, $ minutes, $ seconds, $ month, $ day, $ year );

Return $ timestamp ;}

Usage:

Inetrval indicates the time interval string expression to be added, such as minute or day. number indicates the number of time intervals to be added. Date indicates the Date.
Interval (Time Interval string expression) can be any of the following values:
Yyyy year
Q Quarter
M Month
Y Day of year
D Day
W Weekday
Ww Week of year Week
H Hour
N Minute points
S Second seconds
The roles of w, y, and d are exactly the same, that is, add one day to the current date, add three months to q, and add seven days to ww.

We can save the above Code as the dateadd. inc file, and then run the following code:

<? Php

Include ('dateadd. inc ');

$ Temptime = time ();

Echo '1: '. strftime ("% Y-% m-% d % H: % M: % S", $ temptime );

$ Temptime = DateAdd ("h", 24, $ temptime );

Echo '2: '. strftime ("% Y-% m-% d % H: % M: % S", $ temptime );

Echo '3: '. date ('y: m: d H: I: s ');

$ Time = time ();

$ Tomorrow = time () + 24*3600;

Echo '4: '. date ('y: m: d H: I: s', $ tomorrow );

$ Yestoday = time () + 24*3600;

Echo '5: '. date ('y: m: d H: I: s', $ yestoday );

?>