diff --git a/app/client/lib/__tests__/datetime.test.ts b/app/client/lib/__tests__/datetime.test.ts
index 12ed04f5..d5d06030 100644
--- a/app/client/lib/__tests__/datetime.test.ts
+++ b/app/client/lib/__tests__/datetime.test.ts
@@ -64,13 +64,13 @@ describe("datetime formatters", () => {
 	});
 
 	test("formats calendar values with an explicit locale and timezone", () => {
-		expect(formatShortDateTime(sampleDate, { locale: "en-US", timeZone: "UTC" })).toBe("1/10, 2:30 PM");
+		expect(formatShortDateTime(sampleDate, { locale: "en-US", timeZone: "UTC" })).toBe("01/10, 2:30 PM");
 	});
 
 	test.each([
-		["MM/DD/YYYY", "1/10/2026"],
-		["DD/MM/YYYY", "10/1/2026"],
-		["YYYY/MM/DD", "2026/1/10"],
+		["MM/DD/YYYY", "01/10/2026"],
+		["DD/MM/YYYY", "10/01/2026"],
+		["YYYY/MM/DD", "2026/01/10"],
 	] as const)("formats numeric dates with %s order", (dateFormat, expected) => {
 		expect(formatDate(sampleDate, { locale: "en-US", timeZone: "UTC", dateFormat })).toBe(expected);
 	});
@@ -106,6 +106,6 @@ describe("datetime formatters", () => {
 				dateFormat: "DD/MM/YYYY",
 				timeFormat: "24h",
 			}),
-		).toBe("10/1/2026, 14:30");
+		).toBe("10/01/2026, 14:30");
 	});
 });
diff --git a/app/client/lib/datetime.ts b/app/client/lib/datetime.ts
index f77bf4be..75b07ad6 100644
--- a/app/client/lib/datetime.ts
+++ b/app/client/lib/datetime.ts
@@ -67,8 +67,8 @@ function formatConfiguredDate(date: Date, options: DateFormatOptions, includeYea
 	const dateFormat = options.dateFormat ?? DEFAULT_DATE_FORMAT;
 	const safeDateFormat = DATE_FORMATS.includes(dateFormat) ? dateFormat : DEFAULT_DATE_FORMAT;
 	const parts = getDateTimeFormat(options.locale, options.timeZone, {
-		month: "numeric",
-		day: "numeric",
+		month: "2-digit",
+		day: "2-digit",
 		year: "numeric",
 	}).formatToParts(date);
 	const values = {
@@ -148,7 +148,7 @@ export function inferDateTimePreferences(locale?: string) {
 	};
 }
 
-// 1/10/2026, 2:30 PM
+// 01/10/2026, 2:30 PM
 function formatDateTime(date: DateInput, options: DateFormatOptions = {}): string {
 	return formatValidDate(
 		date,
@@ -161,7 +161,7 @@ function formatDateWithMonth(date: DateInput, options: DateFormatOptions = {}):
 	return formatValidDate(date, (validDate) => formatConfiguredDateWithMonth(validDate, options));
 }
 
-// 1/10/2026
+// 01/10/2026
 function formatDate(date: DateInput, options: DateFormatOptions = {}): string {
 	return formatValidDate(date, (validDate) => formatConfiguredDate(validDate, options, true));
 }
@@ -171,7 +171,7 @@ function formatShortDate(date: DateInput, options: DateFormatOptions = {}): stri
 	return formatValidDate(date, (validDate) => formatConfiguredDate(validDate, options, false));
 }
 
-// 1/10, 2:30 PM
+// 01/10, 2:30 PM
 function formatShortDateTime(date: DateInput, options: DateFormatOptions = {}): string {
 	return formatValidDate(
 		date,