clear (self)
QDate date (self)
QDateTime dateTime (self)
setDate (self, QDate date)
setDateTime (self, QDateTime dateTime)
setTime (self, QTime time)
QTime time (self)

now_day = time.strftime("%Y-%m-%d", time.localtime())
self.dateEdit.setDate(QDate.fromString(now_day, 'yyyy-MM-dd'))

now_time = time.strftime("%Y-%m-%d %H:%M:%S", time.localtime())
self.dateTimeEdit.setDateTime(QDateTime.fromString(now_time, 'yyyy-MM-dd hh:mm:ss'))

QDate currentDate ()
QDate fromString (QString s, QString format)
QString toString (self, QString format)
(int year, int month, int day) getDate (self)
int day (self)
int month (self)
int year (self)

QDateTime currentDateTime ()
QDateTime fromString (QString s, QString format)
QString toString (self, QString format)
QDate date (self)
QTime time (self)

start_time = self.dateTimeEdit.dateTime()
end_time = self.dateTimeEdit_2.dateTime()