3: Working with Dates and Times in .NET

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3: Working with Dates and Times
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$query = "SELECT FROM_UNIXTIME('$ts') AS tsField"; $result = mysql_query($query) or die ("Error in query: $query " mysql_error()); $row = mysql_fetch_object($result); mysql_close($connection); // result: "2007-07-02 22:04:32" echo $row->tsField; >
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A common grouse of PHP/MySQL developers is the incompatibility between the date formats used by the two applications Most of PHP s date/time functions use a UNIX timestamp; MySQL s DATETIME and TIMESTAMP fields only accept values in either YYYYMMDDHHMMSS or "YYYY-MM-DD HH:MM:SS" format PHP s date() function will not correctly read a native DATETIME or TIMESTAMP value, and MySQL will simply zero out native UNIX timestamps Consequently, converting between the two formats is a fairly important task for a PHP/MySQL developer Fortunately, there are a couple of ways to go about this, depending on whether you d prefer to do the conversion at the PHP application layer or the MySQL database layer At the PHP layer, you can convert a MySQL DATETIME or TIMESTAMP value into a UNIX timestamp by passing it to the PHP strtotime() function, which is designed speci cally to parse and attempt to convert English-readable date values into UNIX timestamps (see the listing in 34: Converting Strings to Timestamps ) Going the other way, you can insert a UNIX timestamp into a MySQL DATETIME or TIMESTAMP eld by rst formatting it with the PHP date() function At the MySQL layer, you can convert a MySQL DATETIME or TIMESTAMP value into a UNIX timestamp with the MySQL UNIX_TIMESTAMP() function Or, you can save a UNIX timestamp directly to a MySQL DATETIME or TIMESTAMP eld by using MySQL s built-in FROM_UNIXTIME() function to convert the timestamp into MySQL-compliant format
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315 Comparing Dates
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You want to compare two dates to see which is more recent
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Use PHP s comparison operators to compare the timestamps corresponding to the two dates:
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< php // create timestamps for two dates $date1 = mktime(0,0,0,2,1,2007); $date2 = mktime(1,0,0,2,1,2007); // compare timestamps // to see which represents an earlier date if ($date1 > $date2) { $str = date ("d-M-Y H:i:s", $date2) " comes before " date ("d-M-Y H:i:s", $date1); } else if ($date2 > $date1) { $str = date ("d-M-Y H:i:s", $date1) " comes before " date ("d-M-Y H:i:s", $date2); } else { $str = "Dates are equal"; } // result: "01-Feb-2007 00:00:00 comes before 01-Feb-2007 01:00:00" echo $str; >
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PHP s comparison operators work just as well on temporal values as they do on numbers and strings This is illustrated in the previous listing, which compares two dates to see which one precedes the other An alternative is the PEAR Date class, available from http://pearphp net/package/Date Comparing dates with this class is fairly simple: initialize two Date() objects, and then call the compare() method to see which one comes first The compare() method returns 0 if both dates are equal, 1 if the first date is before the second, and 1 if the second date is before the first Here s an illustration:
< php // include Date class include "Datephp"; // initialize two Date objects $date1 = new Date("2007-02-01 00:00:00"); $date2 = new Date("2007-02-01 01:00:00");
3: Working with Dates and Times
// compare dates // returns 0 if the dates are equal // -1 if $date1 is before $date2 // 1 if $date1 is after $date2 // result: -1 echo Date::compare($date1, $date2); >
You could also use either one of the Date() objects before() and after() methods on the other The next listing illustrates this:
< php // include Date class include "Datephp"; // initialize two Date objects $date1 = new Date("2007-02-01 00:00:00"); $date2 = new Date("2006-02-01 00:00:00"); // check if $date1 is before $date2 // result: "false" echo $date1->before($date2) "true" : "false"; // check if $date2 is before $date1 // result: "true" echo $date1->after($date2) "true" : "false"; >
You can compare a date relative to today with the isPast() and isFuture() methods Look in the package documentation for examples
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