Preserve DateTime microsecond precision

2026-08-31 17:52:09 -05:00
parent 2301da8143
commit f2f41782d4
5 changed files with 123 additions and 14 deletions
@@ -0,0 +1,53 @@
+import std/[times, unittest]
+
+import fiber_orm/util
+
+proc utcDateTime(nanosecond: NanosecondRange): DateTime =
+  dateTime(
+    2026, mAug, 26, 14, 32, 10, nanosecond,
+    utc())
+
+suite "PostgreSQL DateTime conversion":
+  test "formats DateTime values with microsecond precision":
+    check dbFormat(utcDateTime(123_457_000)) ==
+      "2026-08-26T14:32:10.123457Z"
+
+  test "parses whole-second, millisecond, and microsecond values":
+    let cases = [
+      ("2026-08-26 14:32:10+00", 0),
+      ("2026-08-26 14:32:10.123+00", 123_000_000),
+      ("2026-08-26 14:32:10.9007+00", 900_700_000),
+      ("2026-08-26 14:32:10.12345+00", 123_450_000),
+      ("2026-08-26 14:32:10.123457+00", 123_457_000),
+    ]
+
+    for (value, expectedNanosecond) in cases:
+      let parsed = parsePGDatetime(value)
+      check parsed.nanosecond == expectedNanosecond
+      check parsed.utc.format("yyyy-MM-dd'T'HH:mm:ss") ==
+        "2026-08-26T14:32:10"
+
+  test "preserves supported separators and timezone representations":
+    let timezoneCases = [
+      "2026-08-26 14:32:10+00",
+      "2026-08-26T14:32:10+00",
+      "2026-08-26T14:32:10+00:00",
+      "2026-08-26 14:32:10.123+00",
+      "2026-08-26T14:32:10.123457+00:00",
+      "2026-08-26T14:32:10.123457Z",
+    ]
+
+    for value in timezoneCases:
+      check parsePGDatetime(value).utc.format("yyyy-MM-dd'T'HH:mm:ss") ==
+        "2026-08-26T14:32:10"
+
+    let localCases = [
+      "2026-08-26 14:32:10",
+      "2026-08-26T14:32:10",
+      "2026-08-26 14:32:10.1",
+      "2026-08-26T14:32:10.12",
+    ]
+
+    for value in localCases:
+      check parsePGDatetime(value).format("yyyy-MM-dd'T'HH:mm:ss") ==
+        "2026-08-26T14:32:10"