Finding the Number of Days in a Month in .NET

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36 Finding the Number of Days in a Month
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You want to find the number of days in a particular month
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Use PHP s date() function with the t modifier:
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< php // get timestamp for month and year Mar 2005 $ts = mktime(0,0,0,3,1,2005); // find number of days in month // result: 31 echo date("t", $ts); >
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Given a UNIX timestamp, the date() function s "t" modifier returns the number of days in the corresponding month The return value will range from 28 to 31 An alternative way of accomplishing the same thing is to use the PEAR Date class, available at http://pearphpnet/package/Date Here, a Date() object is first initialized to a specific day, month, and year combination, and then the class getDaysInMonth() method is used to retrieve the number of days in that month The next listing illustrates this:
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< php // include Date class include "Datephp"; // initialize Date object to 1-Mar-2005 $dt = new Date(); $dt->setYear(2005); $dt->setMonth(3); $dt->setDay(1); // get number of days in month // result: 31 echo $dt->getDaysInMonth(); >
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37 Finding the Day-in-Year or Week-in-Year Number for a Date
Problem
You want to find the day-in-year or week-in-year number for a particular date
Solution
Use PHP s date() function with the "z" or "W" modifier:
< php // get day of year for 01-Mar-2008 // result: 61 echo date("z", mktime(0,0,0,3,1,2008))+1;
3: Working with Dates and Times
// get week of year for 01-Mar-2008 // result: 09 echo date("W", mktime(0,0,0,3,1,2008)); >
Comments
Given a UNIX timestamp, the date() function s "z" modifier returns the day number in the year, while the "W" modifier returns the week number Note that day numbers are indexed from 0, so it is necessary to add 1 to the final result to obtain the actual day number in the year Also look at the listing in 38: Finding the Number of Days or Weeks in a Year for another application of this technique Alternatively, you can use PEAR s Date class, available from http://pear phpnet/package/Date, to obtain the week number Here, a Date() object is first initialized to a specific day, month, and year combination, and then the class getWeekOfYear() method is used to retrieve the week number for that date
< php // include Date class include "Datephp"; // initialize Date object to 1-Mar-2008 $dt = new Date(); $dt->setYear(2008); $dt->setMonth(3); $dt->setDay(1); // get week number in year // result: 9 echo $dt->getWeekOfYear(); >
38 Finding the Number of Days or Weeks in a Year
Problem
You want to find the number of days or weeks in a particular year
PHP Programming Solutions
Solution
Use PHP s date() function with the "z" or "W" modifiers:
< php // get total number of days in the year 2001 $numDays = date("z", mktime(0,0,0,12,31,2001))+1; // get total number of weeks in the year 2001 $numWeeks = date("W", mktime(0,0,0,12,28,2001)); // result: "There are 365 days and 52 weeks in 2001" echo "There are $numDays days and $numWeeks weeks in 2001\n"; >
Comments
Given a UNIX timestamp, the date() function s "z" modifier returns the day number in the year, while the "W" modifier returns the week number By passing a timestamp representation of the last day or last week of the year, it s possible to quickly find the total number of days or weeks in the year Also look at the listing in 37: Finding the Day-in-Year or Week-in-Year Number for a Date for another application of this technique Note that the value returned by the "z" modifier is indexed from 0, so it is necessary to add 1 to the final result to obtain the actual number of days in the year
39 Finding the Day Name for a Date
Problem
You want to find which day of the week a particular date falls on
Solution
Use PHP s date() function with the "l" modifier:
< php // get timestamp for date 04-Jun-2008 $ts = mktime(0,0,0,6,4,2008);
3: Working with Dates and Times
// get day of week // result: "Wednesday" echo date("l", $ts); >
Comments
Given a timestamp representing a particular date, the date() function s "l" modifier returns the weekday name corresponding to that date If you need a numeric value (0 = Sunday, 1 = Monday, ) rather than a string, use the "w" modifier instead
310 Finding the Year Quarter for a Date
Problem
You want to find which quarter of the year a particular date falls in
Solution
Use PHP s date() function with the "m" modifier:
< php // get timestamp for date 04-Jun-2008 $ts = mktime(0,0,0,6,4,2008); // get quarter // result: 2 echo ceil(date("m", $ts)/3); >
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