diff --git a/crates/fidc-core/src/engine.rs b/crates/fidc-core/src/engine.rs
index c821809..48d1255 100644
--- a/crates/fidc-core/src/engine.rs
+++ b/crates/fidc-core/src/engine.rs
@@ -1,7 +1,7 @@
 use std::collections::{BTreeMap, BTreeSet};
 
 use chrono::{Datelike, Duration, NaiveDate, NaiveTime, Timelike};
-use serde::Serialize;
+use serde::{Deserialize, Serialize};
 use thiserror::Error;
 
 use crate::broker::{BrokerExecutionReport, BrokerSimulator, MatchingType};
@@ -71,7 +71,7 @@ impl Default for FuturesValidationConfig {
     }
 }
 
-#[derive(Debug, Clone, Serialize)]
+#[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct DailyEquityPoint {
     #[serde(with = "date_format")]
     pub date: NaiveDate,
@@ -4217,7 +4217,7 @@ fn futures_cancel_report(
 
 mod date_format {
     use chrono::NaiveDate;
-    use serde::Serializer;
+    use serde::{Deserialize, Deserializer, Serializer};
 
     const FORMAT: &str = "%Y-%m-%d";
 
@@ -4227,6 +4227,14 @@ mod date_format {
     {
         serializer.serialize_str(&date.format(FORMAT).to_string())
     }
+
+    pub fn deserialize<'de, D>(deserializer: D) -> Result<NaiveDate, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        let value = String::deserialize(deserializer)?;
+        NaiveDate::parse_from_str(&value, FORMAT).map_err(serde::de::Error::custom)
+    }
 }
 
 #[cfg(test)]
diff --git a/crates/fidc-core/src/portfolio.rs b/crates/fidc-core/src/portfolio.rs
index 803d512..e867b99 100644
--- a/crates/fidc-core/src/portfolio.rs
+++ b/crates/fidc-core/src/portfolio.rs
@@ -1,6 +1,6 @@
 use chrono::NaiveDate;
 use indexmap::IndexMap;
-use serde::Serialize;
+use serde::{Deserialize, Serialize};
 use std::collections::{BTreeMap, BTreeSet};
 
 use crate::data::{DataSet, DataSetError, PriceField};
@@ -1692,7 +1692,7 @@ mod tests {
     }
 }
 
-#[derive(Debug, Clone, Serialize)]
+#[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct HoldingSummary {
     #[serde(with = "date_format")]
     pub date: NaiveDate,
@@ -1730,7 +1730,7 @@ pub struct CashReceivable {
 
 mod date_format {
     use chrono::NaiveDate;
-    use serde::Serializer;
+    use serde::{Deserialize, Deserializer, Serializer};
 
     const FORMAT: &str = "%Y-%m-%d";
 
@@ -1740,6 +1740,14 @@ mod date_format {
     {
         serializer.serialize_str(&date.format(FORMAT).to_string())
     }
+
+    pub fn deserialize<'de, D>(deserializer: D) -> Result<NaiveDate, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        let value = String::deserialize(deserializer)?;
+        NaiveDate::parse_from_str(&value, FORMAT).map_err(serde::de::Error::custom)
+    }
 }
 
 fn round_half_up_u32(value: f64) -> u32 {