timestamptz_hash_extended() — PostgreSQL date/time function

timestamptz_hash_extended(): hash. PostgreSQL date/time functions — signature, volatility, version applicability and an illustrative example.

The Sev-1 Admin
The Sev-1 Admin  ·  1 min read

Summary

timestamptz_hash_extended is a PostgreSQL built-in function in the Date/Time Functions group. PostgreSQL’s system catalog (pg_proc) describes it as: “hash”.

Signature

timestamptz_hash_extended(timestamp with time zone, bigint) → bigint

Argument and return types are taken from the pg_proc catalog; internal type names are shown using their readable SQL spellings (for example int4 is shown as integer). (Derived from the catalog — see the linked reference for the canonical documentation.)

Classification

  • Category: Date/Time Functions
  • Kind: Function
  • Volatility: IMMUTABLE — Marked IMMUTABLE — it always returns the same result for the same arguments and can be used in indexes and other contexts that require immutability.
  • Returns: bigint

Example

Illustrative form (replace placeholder values with your own data):

SELECT timestamptz_hash_extended(TIMESTAMPTZ '2024-01-15 10:30:00+00', 42);

The example above is illustrative and is meant to show calling syntax only; consult the linked PostgreSQL documentation for exact semantics, edge cases and accepted argument combinations.

Version applicability

Based on the catalog across releases, timestamptz_hash_extended first appears in PostgreSQL 18. It is present in: 18, 19.

Related & references

Reference: PostgreSQL documentation — Date/Time Functions.