fixing android whitespace error (#873)

* make fabric spec use strings

* pseudo coding ios conversion

general idea, not tested nor compiled

* make it compile

Author: henninghall

ios/RNDatePicker.mm

@@ -48,9 +48,11 @@ + (ComponentDescriptorProvider)componentDescriptorProvider
 }
 #endif
 
-NSDate* unixMillisToNSDate (double unixMillis) {
-    double time = unixMillis/1000.0;
-    return [NSDate dateWithTimeIntervalSince1970: time];
+NSDate* iso8601StringToNSDate(const std::string &iso8601String) {
+    NSString *nsString = [NSString stringWithUTF8String:iso8601String.c_str()];
+    NSISO8601DateFormatter *isoFormatter = [[NSISO8601DateFormatter alloc] init];
+    NSDate *date = [isoFormatter dateFromString:nsString];
+    return date;
 }
 
 #ifdef RCT_NEW_ARCH_ENABLED
@@ -101,7 +103,7 @@ - (void)updateProps:(Props::Shared const &)props oldProps:(Props::Shared const &
 
     //  date
     if(oldViewProps.date != newViewProps.date) {
-        [_picker setDate: unixMillisToNSDate(newViewProps.date)];
+        [_picker setDate: iso8601StringToNSDate(newViewProps.date)];
     }
 
     //  locale
@@ -113,12 +115,12 @@ - (void)updateProps:(Props::Shared const &)props oldProps:(Props::Shared const &
 
     // maximumDate
     if(oldViewProps.maximumDate != newViewProps.maximumDate) {
-        [_picker setMaximumDate: unixMillisToNSDate(newViewProps.maximumDate)];
+        [_picker setMaximumDate: iso8601StringToNSDate(newViewProps.maximumDate)];
     }
 
     //  minimumDate
     if(oldViewProps.minimumDate != newViewProps.minimumDate) {
-        [_picker setMinimumDate: unixMillisToNSDate(newViewProps.minimumDate)];
+        [_picker setMinimumDate: iso8601StringToNSDate(newViewProps.minimumDate)];
     }
 
     //  setMinuteInterval

ios/RNDatePickerManager.mm

@@ -36,10 +36,10 @@ - (UIView *)view
 }
 
 RCT_EXPORT_VIEW_PROPERTY(text, NSString)
-RCT_EXPORT_VIEW_PROPERTY(date, NSDate)
+RCT_EXPORT_VIEW_PROPERTY(date, NSString)
 RCT_EXPORT_VIEW_PROPERTY(locale, NSLocale)
-RCT_EXPORT_VIEW_PROPERTY(minimumDate, NSDate)
-RCT_EXPORT_VIEW_PROPERTY(maximumDate, NSDate)
+RCT_EXPORT_VIEW_PROPERTY(minimumDate, NSString)
+RCT_EXPORT_VIEW_PROPERTY(maximumDate, NSString)
 RCT_EXPORT_VIEW_PROPERTY(minuteInterval, NSInteger)
 RCT_EXPORT_VIEW_PROPERTY(onChange, RCTBubblingEventBlock)
 RCT_REMAP_VIEW_PROPERTY(mode, datePickerMode, UIDatePickerMode)

src/fabric/RNDatePickerNativeComponent.ts

@@ -13,9 +13,9 @@ type DateEvent = {
 
 export interface NativeProps extends ViewProps {
   locale?: string
-  date: Double
-  maximumDate?: Double
-  minimumDate?: Double
+  date: string
+  maximumDate?: string
+  minimumDate?: string
   minuteInterval?: Int32
   mode?: WithDefault<'date' | 'time' | 'datetime', 'datetime'>
   onChange: BubblingEventHandler<DateEvent>