diff --git a/package.json b/package.json
index 2f73768..7c063f0 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
 	"name": "miniseed",
-	"version": "0.2.0",
+	"version": "0.2.1",
 	"type": "module",
 	"scripts": {
 		"build": "vite build",
diff --git a/src/miniseed.ts b/src/miniseed.ts
index aa7d81a..d7e2982 100644
--- a/src/miniseed.ts
+++ b/src/miniseed.ts
@@ -104,21 +104,24 @@ export function serialiseToMiniSEEDBuffer<T extends keyof typeof encodingTypes>(
 	view.writeString("MS");
 
 	// https://docs.fdsn.org/projects/miniseed3/en/latest/definition.html#field-2
-	view.writeUint8(3);
+	// NOTE: The spec specifies little-endian=true for the others, and leaves it
+	// unspecified for Uint8's, so I'm assuming false
+	view.writeUint8(3, false);
 
 	// https://docs.fdsn.org/projects/miniseed3/en/latest/definition.html#field-3
-	view.writeUint8(metadata.flags);
+	view.writeUint8(metadata.flags, false);
 
 	// https://docs.fdsn.org/projects/miniseed3/en/latest/definition.html#field-4
 	view.writeUint32(metadata.startTime.nanoSecond);
 	view.writeUint16(metadata.startTime.year);
 	view.writeUint16(metadata.startTime.dayOfYear);
-	view.writeUint8(metadata.startTime.hour);
-	view.writeUint8(metadata.startTime.minute);
-	view.writeUint8(metadata.startTime.second);
+
+	view.writeUint8(metadata.startTime.hour, false);
+	view.writeUint8(metadata.startTime.minute, false);
+	view.writeUint8(metadata.startTime.second, false);
 
 	// https://docs.fdsn.org/projects/miniseed3/en/latest/definition.html#field-5
-	view.writeUint8(encodingInfo.code);
+	view.writeUint8(encodingInfo.code, false);
 
 	// https://docs.fdsn.org/projects/miniseed3/en/latest/definition.html#field-6
 	view.writeFloat64(metadata.sampleRatePeriod);
@@ -132,10 +135,10 @@ export function serialiseToMiniSEEDBuffer<T extends keyof typeof encodingTypes>(
 	view.writeUint32(0);
 
 	// https://docs.fdsn.org/projects/miniseed3/en/latest/definition.html#field-9
-	view.writeUint8(metadata.dataPublicationVersion);
+	view.writeUint8(metadata.dataPublicationVersion, false);
 
 	// https://docs.fdsn.org/projects/miniseed3/en/latest/definition.html#field-10
-	view.writeUint8(sourceIdentifier.length);
+	view.writeUint8(sourceIdentifier.length, false);
 
 	// https://docs.fdsn.org/projects/miniseed3/en/latest/definition.html#field-11
 	view.writeUint16(extraHeaders.length);
diff --git a/tests/date-utils.test.ts b/tests/dates.test.ts
similarity index 60%
rename from tests/date-utils.test.ts
rename to tests/dates.test.ts
index 2b54da3..fd4d9f0 100644
--- a/tests/date-utils.test.ts
+++ b/tests/dates.test.ts
@@ -1,5 +1,6 @@
 import { describe, it, expect } from "vitest";
-import { startTimeFromDate } from "../src/miniseed";
+import { startTimeFromDate, serialiseToMiniSEEDBuffer } from "../src/miniseed";
+import jDataView from "z-jdataview-temp-publish";
 
 describe("Date utilities", () => {
 	it("Works with a set date", () => {
@@ -37,3 +38,27 @@ describe("Date utilities", () => {
 		expect(startTime2.dayOfYear).toEqual(61);
 	});
 });
+
+describe("Date serialisation", () => {
+	it("Sets date fields correctly", () => {
+		const date = new Date("21 September 1978 21:45:30");
+		const view = new jDataView(
+			serialiseToMiniSEEDBuffer([1, 2, 3], {
+				sourceIdentifier: "https://zade.viggers.net/example",
+				startTime: startTimeFromDate(date),
+			}),
+			undefined,
+			undefined,
+			true
+		);
+
+		console.log(view.buffer);
+
+		expect(view.getUint32(4)).toEqual(0); // nanosecond
+		expect(view.getUint16(8)).toEqual(1978); // year
+		expect(view.getUint16(10)).toEqual(264); // day of year
+		expect(view.getUint8(12, false)).toEqual(21); // hour
+		expect(view.getUint8(13, false)).toEqual(45); // minute
+		expect(view.getUint8(14, false)).toEqual(30); // second
+	});
+});
diff --git a/tests/vaid-files.test.ts b/tests/vaid-files.test.ts
index 85a82aa..f8067fa 100644
--- a/tests/vaid-files.test.ts
+++ b/tests/vaid-files.test.ts
@@ -66,20 +66,6 @@ describe("Date validity", () => {
 		});
 		await checkData(serialised, "date-0-auto");
 	});
-	// it("Works with a manually set 0 date", async () => {
-	// 	const serialised = serialiseToMiniSEEDUint8Array([], {
-	// 		sourceIdentifier: "https://zade.viggers.net/example",
-	// 		startTime: {
-	// 			dayOfYear: 0,
-	// 			year: 0,
-	// 			hour: 0,
-	// 			minute: 0,
-	// 			second: 0,
-	// 			nanoSecond: 0,
-	// 		},
-	// 	});
-	// 	await checkData(serialised, "date-0-manual");
-	// });
 	it("Works with a new date right now", async () => {
 		const serialised = serialiseToMiniSEEDUint8Array([], {
 			sourceIdentifier: "https://zade.viggers.net/example",