diff --git a/crates/diesel_crud_trait/src/error.rs b/crates/diesel_crud_trait/src/error.rs
index 0933980..157bb05 100644
--- a/crates/diesel_crud_trait/src/error.rs
+++ b/crates/diesel_crud_trait/src/error.rs
@@ -2,7 +2,7 @@ use diesel::result::Error;
 use thiserror::Error;
 
 /// Error type for CRUD operations
-#[derive(Debug, Error)]
+#[derive(Debug, PartialEq, Error)]
 pub enum CrudError {
     #[error("Resource not found")]
     NotFound,
diff --git a/src/axum/wrappers.rs b/src/axum/wrappers.rs
index fa0e3f6..141bfc1 100644
--- a/src/axum/wrappers.rs
+++ b/src/axum/wrappers.rs
@@ -3,12 +3,14 @@ use derive_more::{Constructor, From};
 use into_response_derive::IntoResponse;
 use serde::Serialize;
 
-#[derive(Debug, Clone, Serialize, From, Constructor)]
+#[derive(Debug, Clone, PartialEq, Default, Serialize, From, Constructor)]
 pub struct Array<T: Serialize> {
     pub data: Vec<T>,
 }
 
-#[derive(Debug, Clone, Copy, Serialize, IntoResponse, From, Constructor)]
+#[derive(
+    Debug, Clone, Copy, PartialEq, Eq, Default, Serialize, IntoResponse, From, Constructor,
+)]
 pub struct Count {
     pub count: usize,
 }
diff --git a/src/time/common.rs b/src/time/common.rs
index 31b50d5..ae20c67 100644
--- a/src/time/common.rs
+++ b/src/time/common.rs
@@ -1,9 +1,62 @@
 use chrono::NaiveDateTime;
-use derive_more::Constructor;
+use derive_more::{Constructor, From};
 
-#[derive(Debug, Clone, Copy, Default, PartialEq, Eq, Constructor)]
+#[derive(Debug, Clone, Copy, Default, PartialEq, Eq, Constructor, From)]
 #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub struct DateTimeInterval {
     pub start: NaiveDateTime,
     pub end: NaiveDateTime,
 }
+
+impl DateTimeInterval {
+    /// Creates a new `DateTimeInterval` from the given `start` and `end` `NaiveDateTime`s.
+    /// The `start` must be before the `end`.
+    /// If `start` is equal to or after `end`, this function will return `None`.
+    /// # Arguments
+    /// * `start` - The start of the interval.
+    /// * `end` - The end of the interval.
+    /// # Returns
+    /// A new `DateTimeInterval` if `start` is before `end`, otherwise `None`.
+    /// # Examples
+    /// ```
+    /// use chrono::{NaiveDateTime, Duration, Utc};
+    /// use lib::time::common::DateTimeInterval;
+    ///
+    /// let start = Utc::now().naive_utc();
+    /// let end = start + Duration::days(1);
+    /// let interval = DateTimeInterval::new_safe(start, end);
+    /// assert_eq!(interval, Some((start, end).into()));
+    /// ```
+    /// Illegal interval:
+    /// ```
+    /// use chrono::{NaiveDateTime, Utc};
+    /// use lib::time::common::DateTimeInterval;
+    /// let start = Utc::now().naive_utc();
+    /// let end = start;
+    /// let interval = DateTimeInterval::new_safe(start, end);
+    /// assert_eq!(interval, None);
+    pub fn new_safe(start: NaiveDateTime, end: NaiveDateTime) -> Option<Self> {
+        if start < end {
+            Some(Self::new(start, end))
+        } else {
+            None
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use chrono::DateTime;
+
+    #[test]
+    fn test_new_safe() {
+        let start = DateTime::from_timestamp(0, 0).unwrap().naive_utc();
+        let end = DateTime::from_timestamp(1, 0).unwrap().naive_utc();
+        assert_eq!(
+            DateTimeInterval::new_safe(start, end),
+            Some(DateTimeInterval::new(start, end))
+        );
+        assert_eq!(DateTimeInterval::new_safe(end, start), None);
+    }
+}