diff --git a/esphome/components/datetime/date_entity.cpp b/esphome/components/datetime/date_entity.cpp
index 997aec3f69..b99b89259f 100644
--- a/esphome/components/datetime/date_entity.cpp
+++ b/esphome/components/datetime/date_entity.cpp
@@ -37,8 +37,6 @@ void DateEntity::publish_state() {
 #endif
 }
 
-DateCall DateEntity::make_call() { return DateCall(this); }
-
 void DateCall::validate_() {
   if (this->year_.has_value() && (this->year_ < 1970 || this->year_ > 3000)) {
     ESP_LOGE(TAG, "Year must be between 1970 and 3000");
diff --git a/esphome/components/datetime/date_entity.h b/esphome/components/datetime/date_entity.h
index 9b86c12228..93ce1411f8 100644
--- a/esphome/components/datetime/date_entity.h
+++ b/esphome/components/datetime/date_entity.h
@@ -96,6 +96,8 @@ class DateCall {
   optional<uint8_t> day_;
 };
 
+inline DateCall DateEntity::make_call() { return DateCall(this); }
+
 template<typename... Ts> class DateSetAction final : public Action<Ts...>, public Parented<DateEntity> {
  public:
   TEMPLATABLE_VALUE(ESPTime, date)
diff --git a/esphome/components/datetime/datetime_entity.cpp b/esphome/components/datetime/datetime_entity.cpp
index a8e00d6eb3..8f180fd081 100644
--- a/esphome/components/datetime/datetime_entity.cpp
+++ b/esphome/components/datetime/datetime_entity.cpp
@@ -53,8 +53,6 @@ void DateTimeEntity::publish_state() {
 #endif
 }
 
-DateTimeCall DateTimeEntity::make_call() { return DateTimeCall(this); }
-
 ESPTime DateTimeEntity::state_as_esptime() const {
   ESPTime obj;
   obj.year = this->year_;
diff --git a/esphome/components/datetime/datetime_entity.h b/esphome/components/datetime/datetime_entity.h
index 159e4ccc6f..fec620b5ba 100644
--- a/esphome/components/datetime/datetime_entity.h
+++ b/esphome/components/datetime/datetime_entity.h
@@ -121,6 +121,8 @@ class DateTimeCall {
   optional<uint8_t> second_;
 };
 
+inline DateTimeCall DateTimeEntity::make_call() { return DateTimeCall(this); }
+
 template<typename... Ts> class DateTimeSetAction final : public Action<Ts...>, public Parented<DateTimeEntity> {
  public:
   TEMPLATABLE_VALUE(ESPTime, datetime)
diff --git a/esphome/components/datetime/time_entity.cpp b/esphome/components/datetime/time_entity.cpp
index 1cc9eaf2fb..da4c9eb31e 100644
--- a/esphome/components/datetime/time_entity.cpp
+++ b/esphome/components/datetime/time_entity.cpp
@@ -33,8 +33,6 @@ void TimeEntity::publish_state() {
 #endif
 }
 
-TimeCall TimeEntity::make_call() { return TimeCall(this); }
-
 void TimeCall::validate_() {
   if (this->hour_.has_value() && this->hour_ > 23) {
     ESP_LOGE(TAG, "Hour must be between 0 and 23");
diff --git a/esphome/components/datetime/time_entity.h b/esphome/components/datetime/time_entity.h
index 643f4bd176..736e26f4a7 100644
--- a/esphome/components/datetime/time_entity.h
+++ b/esphome/components/datetime/time_entity.h
@@ -98,6 +98,8 @@ class TimeCall {
   optional<uint8_t> second_;
 };
 
+inline TimeCall TimeEntity::make_call() { return TimeCall(this); }
+
 template<typename... Ts> class TimeSetAction final : public Action<Ts...>, public Parented<TimeEntity> {
  public:
   TEMPLATABLE_VALUE(ESPTime, time)