public function initDatetime()
    {
        if ($this->timeFormat === static::$timeFormatDatetime) {
            return static::$initDatetime;
        }
        if ($this->timeFormat === static::$timeFormatTimestamp) {
            return static::$initTimestamp;
        }
        return null;
    }
public function initDatetime()
    {
        if ($this->timeFormat === static::$timeFormatDatetime) {
            return static::$initDatetime;
        }
        if ($this->timeFormat === static::$timeFormatTimestamp) {
            return static::$initTimestamp;
        }
        return null;
    }
public function initDatetime ( ) { if ( $ this -> timeFormat === static :: $ timeFormatDatetime ) { return static :: $ initDatetime ; } if ( $ this -> timeFormat === static :: $ timeFormatTimestamp ) { return static :: $ initTimestamp ; } return null ; }
Get init date & time, by current time format.
@return string|int Date & time string if format is datetime, or timestamp.
Get init date & time by current time format .