diff --git a/packages/core/src/useDateTimeField/temporalPartial.ts b/packages/core/src/useDateTimeField/temporalPartial.ts
index c5dd5016..29e60a31 100644
--- a/packages/core/src/useDateTimeField/temporalPartial.ts
+++ b/packages/core/src/useDateTimeField/temporalPartial.ts
@@ -4,17 +4,17 @@ import { CalendarIdentifier } from '../useCalendar';
 import { isObject } from '../../../shared/src';
 
 export function createTemporalPartial(calendar: CalendarIdentifier, timeZone: string) {
-  const zonedDateTime = Temporal.Now.zonedDateTime(calendar, timeZone);
+  const zonedDateTime = Temporal.Now.zonedDateTime(calendar, timeZone) as TemporalPartial;
   zonedDateTime['~fw_temporal_partial'] = {};
 
-  return zonedDateTime as TemporalPartial;
+  return zonedDateTime;
 }
 
 export function toTemporalPartial(
   value: Temporal.ZonedDateTime | TemporalPartial,
   setParts?: DateTimeSegmentType[],
 ): TemporalPartial {
-  const clone = Temporal.ZonedDateTime.from(value);
+  const clone = Temporal.ZonedDateTime.from(value) as TemporalPartial;
   clone['~fw_temporal_partial'] = isTemporalPartial(value) ? value['~fw_temporal_partial'] : {};
   if (setParts) {
     setParts.forEach(part => {
@@ -22,11 +22,11 @@ export function toTemporalPartial(
     });
   }
 
-  return clone as TemporalPartial;
+  return clone;
 }
 
 export function isTemporalPartial(value: Temporal.ZonedDateTime): value is TemporalPartial {
-  return isObject(value['~fw_temporal_partial']);
+  return isObject((value as TemporalPartial)['~fw_temporal_partial']);
 }
 
 export function isTemporalPartSet(value: TemporalPartial, part: DateTimeSegmentType): boolean {
diff --git a/packages/core/src/useDateTimeField/types.ts b/packages/core/src/useDateTimeField/types.ts
index e235e2a7..b5b66367 100644
--- a/packages/core/src/useDateTimeField/types.ts
+++ b/packages/core/src/useDateTimeField/types.ts
@@ -30,5 +30,4 @@ export type TemporalPartial = Temporal.ZonedDateTime & {
   [`~fw_temporal_partial`]: {
     [key: string]: boolean | undefined;
   };
-  [`~fw_temporal_full_partial`]?: true;
 };
diff --git a/packages/core/src/useDateTimeField/useDateTimeSegmentGroup.ts b/packages/core/src/useDateTimeField/useDateTimeSegmentGroup.ts
index dd6d650c..9f3c6144 100644
--- a/packages/core/src/useDateTimeField/useDateTimeSegmentGroup.ts
+++ b/packages/core/src/useDateTimeField/useDateTimeSegmentGroup.ts
@@ -295,7 +295,7 @@ function useDateArithmetic({ currentDate }: ArithmeticInit) {
     });
 
     if (isTemporalPartial(date)) {
-      newDate['~fw_temporal_partial'] = {
+      (newDate as TemporalPartial)['~fw_temporal_partial'] = {
         ...date['~fw_temporal_partial'],
         [part]: true,
       };
@@ -334,7 +334,7 @@ function useDateArithmetic({ currentDate }: ArithmeticInit) {
               });
       }
 
-      newDate['~fw_temporal_partial'] = {
+      (newDate as TemporalPartial)['~fw_temporal_partial'] = {
         ...date['~fw_temporal_partial'],
         [part]: true,
       };