sourcemeta · jviotti · Oct 22, 2025 · Oct 22, 2025
diff --git a/README.markdown b/README.markdown
@@ -48,6 +48,7 @@ expressed as JSON Schema definitions.
 | IETF | [RFC 8141](https://www.rfc-editor.org/rfc/rfc8141) | Uniform Resource Names (URNs) |
 | IETF | [RFC 9110](https://www.rfc-editor.org/rfc/rfc9110) | HTTP Semantics |
 | ISO | [ISO 4217](https://www.iso.org/iso-4217-currency-codes.html) | Codes for the representation of currencies and funds |
+| ISO | [ISO 8601-1:2019](https://www.iso.org/standard/70907.html) | Date and time — Representations for information interchange — Part 1: Basic rules |
 | ISO | [ISO 80000-1:2022](https://www.iso.org/standard/76921.html) | Quantities and units — Part 1: General |
 | ISO/IEC | [ISO/IEC 2382:2015](https://www.iso.org/standard/63598.html) | Information technology — Vocabulary |
 | JSON-RPC | [JSON-RPC 2.0](https://www.jsonrpc.org/specification) | JSON-RPC 2.0 Specification |

diff --git a/schemas/iso/datetime/2019/duration-calendar-basic.json b/schemas/iso/datetime/2019/duration-calendar-basic.json
@@ -0,0 +1,10 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "title": "ISO 8601-1:2019 Duration (Alternative Calendar Basic Format)",
+  "description": "A duration in alternative basic format P[YYYYMMDD]T[HHMMSS] (§5.5.2.4)",
+  "$comment": "https://www.iso.org/standard/70907.html",
+  "examples": [ "P00020110T223355", "P00010101T000000", "P00001231T235959" ],
+  "x-license": "https://github.com/sourcemeta/std/blob/main/LICENSE",
+  "type": "string",
+  "pattern": "^P(?:[0-9]{4}|[+-][0-9]{5,})(?:0[1-9]|1[0-2])(?:0[1-9]|[12][0-9]|3[01])T(?:[01][0-9]|2[0-3])(?:[0-5][0-9])(?:[0-5][0-9])$"
+}
diff --git a/schemas/iso/datetime/2019/duration-calendar-extended.json b/schemas/iso/datetime/2019/duration-calendar-extended.json
@@ -0,0 +1,14 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "title": "ISO 8601-1:2019 Duration (Alternative Calendar Extended Format)",
+  "description": "A duration in alternative extended format P[YYYY-MM-DD]T[HH:MM:SS] (§5.5.2.4)",
+  "$comment": "https://www.iso.org/standard/70907.html",
+  "examples": [
+    "P0002-01-10T22:33:55",
+    "P0001-01-01T00:00:00",
+    "P0001-12-31T23:59:59"
+  ],
+  "x-license": "https://github.com/sourcemeta/std/blob/main/LICENSE",
+  "type": "string",
+  "pattern": "^P(?:[0-9]{4}|[+-][0-9]{5,})-(?:0[1-9]|1[0-2])-(?:0[1-9]|[12][0-9]|3[01])T(?:[01][0-9]|2[0-3]):(?:[0-5][0-9]):(?:[0-5][0-9])$"
+}
diff --git a/schemas/iso/datetime/2019/duration-designator.json b/schemas/iso/datetime/2019/duration-designator.json
@@ -0,0 +1,223 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "title": "ISO 8601-1:2019 Duration (Designator Format)",
+  "description": "A duration in designator format P[n]Y[n]M[n]DT[n]H[n]M[n]S (§5.5.2.2, §5.5.2.3)",
+  "$comment": "https://www.iso.org/standard/70907.html",
+  "examples": [
+    "P3Y6M4DT12H30M5S",
+    "P1Y",
+    "PT1H",
+    "P1DT1S",
+    "P0Y0M0DT0H0M0S",
+    "P1.5Y",
+    "PT0.5H"
+  ],
+  "x-license": "https://github.com/sourcemeta/std/blob/main/LICENSE",
+  "type": "string",
+  "allOf": [
+    {
+      "not": {
+        "const": "P"
+      }
+    },
+    {
+      "not": {
+        "const": "PT"
+      }
+    }
+  ],
+  "anyOf": [
+    {
+      "$comment": "Date-only: Years with decimal (lowest order)",
+      "pattern": "^P[0-9]+(?:\\.[0-9]+)?Y$"
+    },
+    {
+      "$comment": "Date-only: Years (integer) + Months with decimal (lowest order)",
+      "pattern": "^P[0-9]+Y[0-9]+(?:\\.[0-9]+)?M$"
+    },
+    {
+      "$comment": "Date-only: Years (integer) + Months (integer) + Days with decimal (lowest order)",
+      "pattern": "^P[0-9]+Y[0-9]+M[0-9]+(?:\\.[0-9]+)?D$"
+    },
+    {
+      "$comment": "Date-only: Months with decimal (lowest order)",
+      "pattern": "^P[0-9]+(?:\\.[0-9]+)?M$"
+    },
+    {
+      "$comment": "Date-only: Months (integer) + Days with decimal (lowest order)",
+      "pattern": "^P[0-9]+M[0-9]+(?:\\.[0-9]+)?D$"
+    },
+    {
+      "$comment": "Date-only: Days with decimal (lowest order)",
+      "pattern": "^P[0-9]+(?:\\.[0-9]+)?D$"
+    },
+    {
+      "$comment": "Time-only: Hours with decimal (lowest order)",
+      "pattern": "^PT[0-9]+(?:\\.[0-9]+)?H$"
+    },
+    {
+      "$comment": "Time-only: Hours (integer) + Minutes with decimal (lowest order)",
+      "pattern": "^PT[0-9]+H[0-9]+(?:\\.[0-9]+)?M$"
+    },
+    {
+      "$comment": "Time-only: Hours (integer) + Minutes (integer) + Seconds with decimal (lowest order)",
+      "pattern": "^PT[0-9]+H[0-9]+M[0-9]+(?:\\.[0-9]+)?S$"
+    },
+    {
+      "$comment": "Time-only: Minutes with decimal (lowest order)",
+      "pattern": "^PT[0-9]+(?:\\.[0-9]+)?M$"
+    },
+    {
+      "$comment": "Time-only: Minutes (integer) + Seconds with decimal (lowest order)",
+      "pattern": "^PT[0-9]+M[0-9]+(?:\\.[0-9]+)?S$"
+    },
+    {
+      "$comment": "Time-only: Seconds with decimal (lowest order)",
+      "pattern": "^PT[0-9]+(?:\\.[0-9]+)?S$"
+    },
+    {
+      "$comment": "Date+Time: Years + Hours with decimal (lowest order)",
+      "pattern": "^P[0-9]+YT[0-9]+(?:\\.[0-9]+)?H$"
+    },
+    {
+      "$comment": "Date+Time: Years + Hours (integer) + Minutes with decimal (lowest order)",
+      "pattern": "^P[0-9]+YT[0-9]+H[0-9]+(?:\\.[0-9]+)?M$"
+    },
+    {
+      "$comment": "Date+Time: Years + Hours (integer) + Minutes (integer) + Seconds with decimal (lowest order)",
+      "pattern": "^P[0-9]+YT[0-9]+H[0-9]+M[0-9]+(?:\\.[0-9]+)?S$"
+    },
+    {
+      "$comment": "Date+Time: Years + Minutes with decimal (lowest order)",
+      "pattern": "^P[0-9]+YT[0-9]+(?:\\.[0-9]+)?M$"
+    },
+    {
+      "$comment": "Date+Time: Years + Minutes (integer) + Seconds with decimal (lowest order)",
+      "pattern": "^P[0-9]+YT[0-9]+M[0-9]+(?:\\.[0-9]+)?S$"
+    },
+    {
+      "$comment": "Date+Time: Years + Seconds with decimal (lowest order)",
+      "pattern": "^P[0-9]+YT[0-9]+(?:\\.[0-9]+)?S$"
+    },
+    {
+      "$comment": "Date+Time: Years (integer) + Months + Hours with decimal (lowest order)",
+      "pattern": "^P[0-9]+Y[0-9]+MT[0-9]+(?:\\.[0-9]+)?H$"
+    },
+    {
+      "$comment": "Date+Time: Years (integer) + Months + Hours (integer) + Minutes with decimal (lowest order)",
+      "pattern": "^P[0-9]+Y[0-9]+MT[0-9]+H[0-9]+(?:\\.[0-9]+)?M$"
+    },
+    {
+      "$comment": "Date+Time: Years (integer) + Months + Hours (integer) + Minutes (integer) + Seconds with decimal (lowest order)",
+      "pattern": "^P[0-9]+Y[0-9]+MT[0-9]+H[0-9]+M[0-9]+(?:\\.[0-9]+)?S$"
+    },
+    {
+      "$comment": "Date+Time: Years (integer) + Months + Minutes with decimal (lowest order)",
+      "pattern": "^P[0-9]+Y[0-9]+MT[0-9]+(?:\\.[0-9]+)?M$"
+    },
+    {
+      "$comment": "Date+Time: Years (integer) + Months + Minutes (integer) + Seconds with decimal (lowest order)",
+      "pattern": "^P[0-9]+Y[0-9]+MT[0-9]+M[0-9]+(?:\\.[0-9]+)?S$"
+    },
+    {
+      "$comment": "Date+Time: Years (integer) + Months + Seconds with decimal (lowest order)",
+      "pattern": "^P[0-9]+Y[0-9]+MT[0-9]+(?:\\.[0-9]+)?S$"
+    },
+    {
+      "$comment": "Date+Time: Years (integer) + Months (integer) + Days + Hours with decimal (lowest order)",
+      "pattern": "^P[0-9]+Y[0-9]+M[0-9]+DT[0-9]+(?:\\.[0-9]+)?H$"
+    },
+    {
+      "$comment": "Date+Time: Years (integer) + Months (integer) + Days + Hours (integer) + Minutes with decimal (lowest order)",
+      "pattern": "^P[0-9]+Y[0-9]+M[0-9]+DT[0-9]+H[0-9]+(?:\\.[0-9]+)?M$"
+    },
+    {
+      "$comment": "Date+Time: Years (integer) + Months (integer) + Days + Hours (integer) + Minutes (integer) + Seconds with decimal (lowest order)",
+      "pattern": "^P[0-9]+Y[0-9]+M[0-9]+DT[0-9]+H[0-9]+M[0-9]+(?:\\.[0-9]+)?S$"
+    },
+    {
+      "$comment": "Date+Time: Years (integer) + Months (integer) + Days + Minutes with decimal (lowest order)",
+      "pattern": "^P[0-9]+Y[0-9]+M[0-9]+DT[0-9]+(?:\\.[0-9]+)?M$"
+    },
+    {
+      "$comment": "Date+Time: Years (integer) + Months (integer) + Days + Minutes (integer) + Seconds with decimal (lowest order)",
+      "pattern": "^P[0-9]+Y[0-9]+M[0-9]+DT[0-9]+M[0-9]+(?:\\.[0-9]+)?S$"
+    },
+    {
+      "$comment": "Date+Time: Years (integer) + Months (integer) + Days + Seconds with decimal (lowest order)",
+      "pattern": "^P[0-9]+Y[0-9]+M[0-9]+DT[0-9]+(?:\\.[0-9]+)?S$"
+    },
+    {
+      "$comment": "Date+Time: Months + Hours with decimal (lowest order)",
+      "pattern": "^P[0-9]+MT[0-9]+(?:\\.[0-9]+)?H$"
+    },
+    {
+      "$comment": "Date+Time: Months + Hours (integer) + Minutes with decimal (lowest order)",
+      "pattern": "^P[0-9]+MT[0-9]+H[0-9]+(?:\\.[0-9]+)?M$"
+    },
+    {
+      "$comment": "Date+Time: Months + Hours (integer) + Minutes (integer) + Seconds with decimal (lowest order)",
+      "pattern": "^P[0-9]+MT[0-9]+H[0-9]+M[0-9]+(?:\\.[0-9]+)?S$"
+    },
+    {
+      "$comment": "Date+Time: Months + Minutes with decimal (lowest order)",
+      "pattern": "^P[0-9]+MT[0-9]+(?:\\.[0-9]+)?M$"
+    },
+    {
+      "$comment": "Date+Time: Months + Minutes (integer) + Seconds with decimal (lowest order)",
+      "pattern": "^P[0-9]+MT[0-9]+M[0-9]+(?:\\.[0-9]+)?S$"
+    },
+    {
+      "$comment": "Date+Time: Months + Seconds with decimal (lowest order)",
+      "pattern": "^P[0-9]+MT[0-9]+(?:\\.[0-9]+)?S$"
+    },
+    {
+      "$comment": "Date+Time: Months (integer) + Days + Hours with decimal (lowest order)",
+      "pattern": "^P[0-9]+M[0-9]+DT[0-9]+(?:\\.[0-9]+)?H$"
+    },
+    {
+      "$comment": "Date+Time: Months (integer) + Days + Hours (integer) + Minutes with decimal (lowest order)",
+      "pattern": "^P[0-9]+M[0-9]+DT[0-9]+H[0-9]+(?:\\.[0-9]+)?M$"
+    },
+    {
+      "$comment": "Date+Time: Months (integer) + Days + Hours (integer) + Minutes (integer) + Seconds with decimal (lowest order)",
+      "pattern": "^P[0-9]+M[0-9]+DT[0-9]+H[0-9]+M[0-9]+(?:\\.[0-9]+)?S$"
+    },
+    {
+      "$comment": "Date+Time: Months (integer) + Days + Minutes with decimal (lowest order)",
+      "pattern": "^P[0-9]+M[0-9]+DT[0-9]+(?:\\.[0-9]+)?M$"
+    },
+    {
+      "$comment": "Date+Time: Months (integer) + Days + Minutes (integer) + Seconds with decimal (lowest order)",
+      "pattern": "^P[0-9]+M[0-9]+DT[0-9]+M[0-9]+(?:\\.[0-9]+)?S$"
+    },
+    {
+      "$comment": "Date+Time: Months (integer) + Days + Seconds with decimal (lowest order)",
+      "pattern": "^P[0-9]+M[0-9]+DT[0-9]+(?:\\.[0-9]+)?S$"
+    },
+    {
+      "$comment": "Date+Time: Days + Hours with decimal (lowest order)",
+      "pattern": "^P[0-9]+DT[0-9]+(?:\\.[0-9]+)?H$"
+    },
+    {
+      "$comment": "Date+Time: Days + Hours (integer) + Minutes with decimal (lowest order)",
+      "pattern": "^P[0-9]+DT[0-9]+H[0-9]+(?:\\.[0-9]+)?M$"
+    },
+    {
+      "$comment": "Date+Time: Days + Hours (integer) + Minutes (integer) + Seconds with decimal (lowest order)",
+      "pattern": "^P[0-9]+DT[0-9]+H[0-9]+M[0-9]+(?:\\.[0-9]+)?S$"
+    },
+    {
+      "$comment": "Date+Time: Days + Minutes with decimal (lowest order)",
+      "pattern": "^P[0-9]+DT[0-9]+(?:\\.[0-9]+)?M$"
+    },
+    {
+      "$comment": "Date+Time: Days + Minutes (integer) + Seconds with decimal (lowest order)",
+      "pattern": "^P[0-9]+DT[0-9]+M[0-9]+(?:\\.[0-9]+)?S$"
+    },
+    {
+      "$comment": "Date+Time: Days + Seconds with decimal (lowest order)",
+      "pattern": "^P[0-9]+DT[0-9]+(?:\\.[0-9]+)?S$"
+    }
+  ]
+}
diff --git a/schemas/iso/datetime/2019/duration-ordinal-basic.json b/schemas/iso/datetime/2019/duration-ordinal-basic.json
@@ -0,0 +1,10 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "title": "ISO 8601-1:2019 Duration (Alternative Ordinal Basic Format)",
+  "description": "A duration in alternative basic format with ordinal date P[YYYYDDD]T[HHMMSS] (§5.5.2.4)",
+  "$comment": "https://www.iso.org/standard/70907.html",
+  "examples": [ "P0002178T223355", "P0001001T000000", "P0001365T235959" ],
+  "x-license": "https://github.com/sourcemeta/std/blob/main/LICENSE",
+  "type": "string",
+  "pattern": "^P(?:[0-9]{4}|[+-][0-9]{5,})(?:0[0-9][1-9]|0[1-9][0-9]|[12][0-9]{2}|3[0-5][0-9]|36[0-6])T(?:[01][0-9]|2[0-3])(?:[0-5][0-9])(?:[0-5][0-9])$"
+}
diff --git a/schemas/iso/datetime/2019/duration-ordinal-extended.json b/schemas/iso/datetime/2019/duration-ordinal-extended.json
@@ -0,0 +1,14 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "title": "ISO 8601-1:2019 Duration (Alternative Ordinal Extended Format)",
+  "description": "A duration in alternative extended format with ordinal date P[YYYY-DDD]T[HH:MM:SS] (§5.5.2.4)",
+  "$comment": "https://www.iso.org/standard/70907.html",
+  "examples": [
+    "P0002-178T22:33:55",
+    "P0001-001T00:00:00",
+    "P0001-365T23:59:59"
+  ],
+  "x-license": "https://github.com/sourcemeta/std/blob/main/LICENSE",
+  "type": "string",
+  "pattern": "^P(?:[0-9]{4}|[+-][0-9]{5,})-(?:0[0-9][1-9]|0[1-9][0-9]|[12][0-9]{2}|3[0-5][0-9]|36[0-6])T(?:[01][0-9]|2[0-3]):(?:[0-5][0-9]):(?:[0-5][0-9])$"
+}
diff --git a/schemas/iso/datetime/2019/duration-weeks.json b/schemas/iso/datetime/2019/duration-weeks.json
@@ -0,0 +1,10 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "title": "ISO 8601-1:2019 Duration (Weeks Format)",
+  "description": "A duration in complete representation with weeks format P[n]W (§5.5.2.2)",
+  "$comment": "https://www.iso.org/standard/70907.html",
+  "examples": [ "P10W", "P1W", "P52W", "P0W", "P1.5W" ],
+  "x-license": "https://github.com/sourcemeta/std/blob/main/LICENSE",
+  "type": "string",
+  "pattern": "^P[0-9]+(?:\\.[0-9]+)?W$"
+}