fixing android whitespace error

[henninghall]

This is a start to solve issue #840
I have limited internet access until end of januari and wont be able to continue working on this until then.

I encourage anyone to pick it up from here, this is the general idea of the solution I am proposing.

(It is mostly pseudo coding, probably wont compile at this state but you can get the idea)

[johnf]

I have made some changes to get this working. Here is a diff, let me know if you want a PR

Main change is that the argument is a std::string not an NSString

NOTE: I don't code in ObjC, got Chat GPT to help me make it compile :) So no doubt there is probably a more correct way to do this. But tested and works for me

# https://github.com/henninghall/react-native-date-picker/pull/873
diff --git a/src/fabric/RNDatePickerNativeComponent.ts b/src/fabric/RNDatePickerNativeComponent.ts
index 8f9d67e5fdcad8e83c75cdaa861bed777d676951..456439e573260a7c795cba7bcb6a2e4c4b9b4ad0 100644
--- a/src/fabric/RNDatePickerNativeComponent.ts
+++ b/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>
diff --git a/ios/RNDatePicker.mm b/ios/RNDatePicker.mm
--- a/ios/RNDatePicker.mm
+++ b/ios/RNDatePicker.mm
@@ -48,9 +48,11 @@
 }
 #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 @@
     
     //  date
     if(oldViewProps.date != newViewProps.date) {
-        [_picker setDate: unixMillisToNSDate(newViewProps.date)];
+        [_picker setDate: iso8601StringToNSDate(newViewProps.date)];
     }
     
     //  locale
@@ -113,12 +115,12 @@
     
     // 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
diff --git a/ios/RNDatePickerManager.mm b/ios/RNDatePickerManager.mm
--- a/ios/RNDatePickerManager.mm
+++ b/ios/RNDatePickerManager.mm
@@ -36,10 +36,10 @@
 }
 
 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)