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Informix Error -1212: Date conversion format must contain a month, day, and year component.

Cause and resolution

Date conversion format must contain a month, day, and year component.

When a date value is converted between internal binary format and display or entry format, a pattern directs the conversion. When conversion is done automatically, the pattern comes from the environment variable DBDATE. When it is done with an explicit call to the rfmtdate(), rdefmtdate(), or USING functions, a pattern string is passed as a parameter. In any case, the pattern string (the format of the message) must include letters that show the location of the three parts of the date: 2 or 3 letters d; 2 or 3 letters m; and either 2 or 4 letters y.

Oninit® Troubleshooting Guidance

Reasons / Common Causes

-1212 fires when a date-conversion format pattern is missing one of its three required components — per the official guidance, a valid pattern must include 2 or 3 letters of d (day), 2 or 3 letters of m (month), and either 2 or 4 letters of y (year).

  1. A format pattern missing the day, month, or year component entirely, per the official guidance — the direct, only cause.
  2. A format pattern with an unsupported letter count for one of the components (not 2-3 for d/m, not 2 or 4 for y), which similarly fails to satisfy the required pattern shape.
Solutions / Resolution
  1. Include all three components in the format pattern, per the official guidance — 2-3 letters of d, 2-3 letters of m, and 2 or 4 letters of y.
Examples
A format pattern missing the year
SELECT order_date USING 'mmm dd' FROM orders WHERE order_id = 1;
-- -1212: the format has no year component
Corrected
SELECT order_date USING 'mmm dd, yyyy' FROM orders WHERE order_id = 1;
Diagnostic Checks
  1. Check the format pattern for all three required components (day, month, year), with the documented valid letter counts for each.
Related Errors / Related Topics
  • -1210 — "Date could not be converted to month/day/year format." A related date-conversion error, about an out-of-range internal value rather than a malformed format pattern.

The date-conversion format pattern is missing a required component (day, month, or year) — include all three with valid letter counts.