stay complient with arrow spec

src/io/csv/write/serialize.rs

@@ -13,21 +13,21 @@ use super::iterator::{BufStreamingIterator, StreamingIterator};
 
 #[derive(Debug, PartialEq, Eq, Hash, Clone)]
 pub struct SerializeOptions {
-    // used for date32
-    pub date_format: String,
+    /// used for date32
+    pub date32_format: String,
     /// used for dat64
-    pub datetime_format: String,
-    // used for time32/64
+    pub date64_format: String,
+    /// used for time32/64
     pub time_format: String,
-    // used for timestamp
+    /// used for timestamp
     pub timestamp_format: String,
 }
 
 impl Default for SerializeOptions {
     fn default() -> Self {
         Self {
-            date_format: "%F".to_string(),
-            datetime_format: "%FT%H:%M:%S.%9f".to_string(),
+            date32_format: "%F".to_string(),
+            date64_format: "%F".to_string(),
             time_format: "%T".to_string(),
             timestamp_format: "%FT%H:%M:%S.%9f".to_string(),
         }
@@ -129,7 +129,7 @@ pub fn new_serializer<'a>(
                 i32,
                 temporal_conversions::date32_to_datetime,
                 array,
-                &options.date_format
+                &options.date32_format
             )
         }
         DataType::Time32(TimeUnit::Second) => {
@@ -156,7 +156,7 @@ pub fn new_serializer<'a>(
                 i64,
                 temporal_conversions::date64_to_datetime,
                 array,
-                &options.datetime_format
+                &options.date64_format
             )
         }
         DataType::Time64(TimeUnit::Microsecond) => {