A Class for Validating and Formatting Dates
By Tony Marston2005-04-16
Display date to the User
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This function will take a date from the database (although it could come from other sources) and format it ready for display to the user.
This first part checks for input in the format yyyymmdd.
function getExternalDate ($input)
{
if (strlen($input) == 8) {
$pattern = '(^[0-9]{4})' // 4 digits (yyyy)
.'([0-9]{2})' // 2 digits (mm)
.'([0-9]{2}$)'; // 2 digits (dd)
if (ereg($pattern, $input, $regs)) {
if (!checkdate($regs[2], $regs[3], $regs[1])) {
$this->errors = 'This is not a valid date';
return FALSE;
} else {
$monthnum = (int)$regs[2];
$this->externaldate = "$regs[3] " .$this->monthalpha[$monthnum] ." $regs[1]";
return $this->externaldate;
} // if
} // if
$this->errors = "Invalid date format: expected 'yyyymmdd'";
return FALSE;
} // if
If this does not find a match this next part checks for input in the format yyyy-mm-dd.
if (strlen($input) == 10) {
$pattern = '(^[0-9]{4})' // 4 digits (yyyy)
.'([^0-9])' // not a digit
.'([0-9]{2})' // 2 digits (mm)
.'([^0-9])' // not a digit
.'([0-9]{2}$)'; // 2 digits (dd)
if (ereg($pattern, $input, $regs)) {
if (!checkdate($regs[3], $regs[5], $regs[1])) {
$this->errors = 'This is not a valid date';
return FALSE;
} else {
$monthnum = (int)$regs[3];
$this->externaldate = "$regs[5] " .$this->monthalpha[$monthnum] ." $regs[1]";
return $this->externaldate;
} // if
} // if
$this->errors = "Invalid date format: expected 'dd-mm-yyyy'";
return FALSE;
} // ifIf we have not found a match against any of these patterns then we generate an error message before returning an empty result to the user.
$this->errors = 'This is not a valid date';
return $input;
} // getExternalDate
Tutorial Pages:
» A Class for Validating and Formatting Dates
» Defining the Class to Handle Dates
» Display date to the User
» Incrementing or Decrementing a Date
» Using this Class in Your Code
» Summary
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