SQL 错误:ORA-01861:文字与格式字符串 01861 不匹配

I am trying to insert data into an existing table and keep receiving an error.

INSERT INTO Patient  
(
  PatientNo,
  PatientFirstName,
  PatientLastName,
  PatientStreetAddress,
  PatientTown,
  PatientCounty,
  PatientPostcode,
  DOB,
  Gender,
  PatientHomeTelephoneNumber,
  PatientMobileTelephoneNumber
)
VALUES 
(
  121, 
  'Miles', 
  'Malone', 
  '64 Zoo Lane', 
  'Clapham', 
  'United Kingdom',
  'SW4 9LP',
  '1989-12-09',
  'M',
  02086950291,
  07498635200
);

错误:

Error starting at line : 1 in command -
INSERT INTO Patient (PatientNo,PatientFirstName,PatientLastName,PatientStreetAddress,PatientTown,PatientCounty,PatientPostcode,DOB,Gender,PatientHomeTelephoneNumber,PatientMobileTelephoneNumber)
VALUES (121, 'Miles', 'Malone', '64 Zoo Lane', 'Clapham', 'United Kingdom','SW4 9LP','1989-12-09','M',02086950291,07498635200)
Error report -
SQL Error: ORA-01861: literal does not match format string
01861. 00000 -  "literal does not match format string"
*Cause:    Literals in the input must be the same length as literals in
           the format string (with the exception of leading whitespace).  If the
           "FX" modifier has been toggled on, the literal must match exactly,
           with no extra whitespace.
*Action:   Correct the format string to match the literal.

只是不知道为什么会发生这种情况我目前正在学习 SQL，任何帮助将不胜感激！