PHP date and time addition and subtraction program code

The requirement for this example is as follows. Know a date and time,

Example: 10:10:00

I want to add 5 months based on this date and return the processed date.

Result: 10:10:00 + 5 months equals 10:10:00

This is also roughly the meaning of combining the date () and strtotime () functions of PHP functions,

The code is as follows:

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<? Php /** * Date addition and subtraction method in PHP * Qiongtai old house */ // Step 1, assume there is a time $ A = '2017-04-25 10:10:00 ';   // Step 2, obtain the timestamp of this date $ A_time = strtotime ($ );   // Step 3: obtain the timestamp after adding five months $ B _time = strtotime ('+ 5 month', $ a_time );   // Part 4: convert the timestamp back to the date format $ B = date ('Y-m-d H: I: S', $ B _time ); Echo 'This is the date after adding five months '. $ B;   // If you think the above code is too long, you can do it in one line. $ B = date ('Y-m-d H: I: S', strtotime ('+'. $ time. 'Month', strtotime ($ ))); Echo 'This is the date after adding five months '. $ B; ?>

Commonly used computing time

The code is as follows:

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<? Php Date_default_timezone_set ('prc'); // Default time zone Echo "today:", date ("Y-m-d", time (), "<br> "; Echo "today:", date ("Y-m-d", strtotime ("18 June 2008"), "<br> "; Echo "yesterday:", date ("Y-m-d", strtotime ("-1 day"), "<br> "; Echo "tomorrow:", date ("Y-m-d", strtotime ("+ 1 day"), "<br> "; Echo "one week later:", date ("Y-m-d", strtotime ("+ 1 week"), "<br> "; Echo "one week, two days, four hours, two seconds later:", date ("Y-m-d G: H: s ", strtotime ("+ 1 week 2 days 4 hours 2 seconds"), "<br> "; Echo "next Thursday:", date ("Y-m-d", strtotime ("next Thursday"), "<br> "; Echo "last Monday:". date ("Y-m-d", strtotime ("last Monday"). "<br> "; Echo "a month ago:". date ("Y-m-d", strtotime ("last month"). "<br> "; Echo "one month later:". date ("Y-m-d", strtotime ("+ 1 month"). "<br> "; Echo "10 years later:". date ("Y-m-d", strtotime ("+ 10 year"). "<br> "; ?>

Output result

Today: 2013-06-07
Today: 2008-06-18
Yesterday: 2013-06-06
Tomorrow: 2013-06-08
One week later: 2013-06-14
One week, two days, four hours, two seconds later: 18:18:29
Next Thursday:
Last Monday: 2013-06-03
One month ago:
One month later: 2013-07-07
Ten years later: 2023-06-07

Let's look at some date addition and subtraction functions.

The code is as follows:

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// Obtain the day of the week (1-7) Function GetWeek ($ times) { $ Res = date ('W', strtotime ($ times )); If ($ res = 0) $ Res = 7; Return $ res; } // Obtain the current day's time Function GetTime ($ times) { $ Res = date ('H: I ', strtotime ($ times )); Return $ res; } // Obtain the time of the current month Function GetMonth ($ Month, $ type = 'l ') { If (! Strcmp ($ type, 'B ')) $ Res = date ("Y-m-d H: I: s", strtotime ("-$ Month months ")); If (! Strcmp ($ type, 'L ')) $ Res = date ("Y-m-d H: I: s", strtotime ("+ $ Month months ")); Return $ res; } // Obtain the current time Function GetCurrentDateTime () { $ Res = date ("Y-m-d H: I: s", time ()); Return $ res; } // Obtain the time before or after the current time Function GetDiffHours ($ hours, $ type = 'l ') { If (! Strcmp ($ type, 'B ')) $ Res = date ("Y-m-d H: I: s", strtotime ("-$ hours hour ")); If (! Strcmp ($ type, 'L ')) $ Res = date ("Y-m-d H: I: s", strtotime ("+ $ hours hour ")); Return $ res; } // Interval several minutes before or after Function GetDiffMinute ($ Minute, $ type = 'l ') { If (! Strcmp ($ type, 'B ')) $ Res = date ("Y-m-d H: I: s", strtotime ("-$ Minute minute ")); If (! Strcmp ($ type, 'L ')) $ Res = date ("Y-m-d H: I: s", strtotime ("+ $ Minute minute ")); Return $ res; } // Time before or after several seconds Function GetDiffSec ($ sec, $ type = 'l ') { If (! Strcmp ($ type, 'B ')) $ Res = date ("Y-m-d H: I: s", strtotime ("-$ sec second ")); If (! Strcmp ($ type, 'L ')) $ Res = date ("Y-m-d H: I: s", strtotime ("+ $ sec second ")); Return $ res; } // Interval of several weeks before or after Function GetDiffWeek ($ Week, $ type = 'l ') { If (! Strcmp ($ type, 'B ')) $ Res = date ("Y-m-d H: I: s", strtotime ("-$ Week week ")); If (! Strcmp ($ type, 'L ')) $ Res = date ("Y-m-d H: I: s", strtotime ("+ $ Week week ")); Return $ res; } // Interval between several days Function GetDiffDays ($ days, $ type = 'l ') { If (! Strcmp ($ type, 'B ')) $ Res = date ("Y-m-d H: I: s", strtotime ("-$ days day ")); If (! Strcmp ($ type, 'L ')) $ Res = date ("Y-m-d H: I: s", strtotime ("+ $ days day ")); Return $ res; } // Interval of several years before or after Function GetDiffYears ($ year, $ type = 'l ') { If (! Strcmp ($ type, 'B ')) $ Res = date ("Y-m-d H: I: s", strtotime ("-$ year ")); If (! Strcmp ($ type, 'L ')) $ Res = date ("Y-m-d H: I: s", strtotime ("+ $ year ")); Return $ res; }