The “Java peace treaty” is not a standard or widely recognized name for any historical agreement, so there is no clearly documented treaty with that exact title and thus no definitive signing date. Most likely, the phrase is a mistaken or informal reference to one of these:

  • The Treaty of San Francisco (also called the Treaty of Peace with Japan), signed on 8 September 1951 , which formally ended the state of war between Japan and many Allied powers after World War II.
  • Various regional or colonial-era agreements involving Java (the island in Indonesia) under Dutch rule, which are usually referred to by other names and specific local places or parties, not as a “Java peace treaty.”

Because the term “Java peace treaty” does not correspond to a specific, consistently named treaty in mainstream historical references, any exact “signing date” would be speculative rather than factual.