function is_valid($value)
{
assert('is_string($value)');
$pattern = '/^([0-9]{4})-([0-9]{1,2})-([0-9]{1,2})$/';
if (!preg_match($pattern, $value, $matches)) {
return false;
}
return AnewtDateTime::is_valid_date_ymd($matches[1], $matches[2], $matches[3]);
}
/**
* Checks if a given date is valid.
*
* \param $date
* Any date-like object; this could be a string, timestamp or
* a AnewtDateTimeAtom instance.
*
* \return
* True if this is a valid date, false otherwise.
*/
static function is_valid($date)
{
assert('$date instanceof AnewtDateTimeAtom;');
return AnewtDateTime::is_valid_date_ymd(AnewtDateTime::year($date), AnewtDateTime::month($date), AnewtDateTime::day($date)) && AnewtDateTime::is_valid_time_hms(AnewtDateTime::hour($date), AnewtDateTime::minute($date), AnewtDateTime::second($date));
}
