diff --git a/app/soapbox/components/birthday_input.js b/app/soapbox/components/birthday_input.js
index cb1408d51..36473dac8 100644
--- a/app/soapbox/components/birthday_input.js
+++ b/app/soapbox/components/birthday_input.js
@@ -39,8 +39,8 @@ class EditProfile extends ImmutablePureComponent {
 
     if (!supportsBirthdays) return null;
 
-    const maxDate = new Date();
-    maxDate.setDate(maxDate.getDate() - minAge);
+    let maxDate = new Date();
+    maxDate = new Date(maxDate.getTime() - minAge * 1000 * 60 * 60 * 24 + maxDate.getTimezoneOffset() * 1000 * 60);
 
     return (
       <div className='datepicker'>
@@ -56,6 +56,7 @@ class EditProfile extends ImmutablePureComponent {
             wrapperClassName='react-datepicker-wrapper'
             onChange={onChange}
             placeholderText={intl.formatMessage(messages.birthdayPlaceholder)}
+            minDate={new Date('1900-01-01')}
             maxDate={maxDate}
             required={required}
           />
diff --git a/app/soapbox/features/auth_login/components/registration_form.js b/app/soapbox/features/auth_login/components/registration_form.js
index 127916a19..dbda945a8 100644
--- a/app/soapbox/features/auth_login/components/registration_form.js
+++ b/app/soapbox/features/auth_login/components/registration_form.js
@@ -223,7 +223,7 @@ class RegistrationForm extends ImmutablePureComponent {
       }
 
       if (birthday) {
-        params.set('birthday', birthday.toISOString().slice(0, 10));
+        params.set('birthday', new Date(birthday.getTime() - (birthday.getTimezoneOffset() * 60000)).toISOString().slice(0, 10));
       }
     });
 
diff --git a/app/soapbox/features/edit_profile/index.js b/app/soapbox/features/edit_profile/index.js
index cf73ddbc4..8fe4ddd2b 100644
--- a/app/soapbox/features/edit_profile/index.js
+++ b/app/soapbox/features/edit_profile/index.js
@@ -125,7 +125,10 @@ class EditProfile extends ImmutablePureComponent {
       map.set('hide_network', hidesNetwork(account));
       map.set('discoverable', discoverable);
       map.set('show_birthday', showBirthday);
-      if (birthday) map.set('birthday', new Date(birthday));
+      if (birthday) {
+        const date = new Date(birthday);
+        map.set('birthday', new Date(date.getTime() + (date.getTimezoneOffset() * 60000)));
+      }
       unescapeParams(map, ['display_name', 'bio']);
     });
 
@@ -166,7 +169,9 @@ class EditProfile extends ImmutablePureComponent {
       hide_follows: state.hide_network,
       hide_followers_count: state.hide_network,
       hide_follows_count: state.hide_network,
-      birthday: state.birthday?.toISOString().slice(0, 10),
+      birthday: state.birthday
+        ? new Date(state.birthday.getTime() - (state.birthday.getTimezoneOffset() * 60000)).toISOString().slice(0, 10)
+        : undefined,
       show_birthday: state.show_birthday,
     }, this.getFieldParams().toJS());
   }