diff --git a/esphome/components/datetime/date_entity.cpp b/esphome/components/datetime/date_entity.cpp
index 2c2775ecf..c061bc81f 100644
--- a/esphome/components/datetime/date_entity.cpp
+++ b/esphome/components/datetime/date_entity.cpp
@@ -5,8 +5,7 @@
 
 #include "esphome/core/log.h"
 
-namespace esphome {
-namespace datetime {
+namespace esphome::datetime {
 
 static const char *const TAG = "datetime.date_entity";
 
@@ -129,7 +128,6 @@ void DateEntityRestoreState::apply(DateEntity *date) {
   date->publish_state();
 }
 
-}  // namespace datetime
-}  // namespace esphome
+}  // namespace esphome::datetime
 
 #endif  // USE_DATETIME_DATE
diff --git a/esphome/components/datetime/date_entity.h b/esphome/components/datetime/date_entity.h
index ba2edb127..069116d16 100644
--- a/esphome/components/datetime/date_entity.h
+++ b/esphome/components/datetime/date_entity.h
@@ -10,8 +10,7 @@
 
 #include "datetime_base.h"
 
-namespace esphome {
-namespace datetime {
+namespace esphome::datetime {
 
 #define LOG_DATETIME_DATE(prefix, type, obj) \
   if ((obj) != nullptr) { \
@@ -111,7 +110,6 @@ template<typename... Ts> class DateSetAction : public Action<Ts...>, public Pare
   }
 };
 
-}  // namespace datetime
-}  // namespace esphome
+}  // namespace esphome::datetime
 
 #endif  // USE_DATETIME_DATE
diff --git a/esphome/components/datetime/datetime_base.h b/esphome/components/datetime/datetime_base.h
index b5f54ac96..7b9b281ea 100644
--- a/esphome/components/datetime/datetime_base.h
+++ b/esphome/components/datetime/datetime_base.h
@@ -8,8 +8,7 @@
 #include "esphome/components/time/real_time_clock.h"
 #endif
 
-namespace esphome {
-namespace datetime {
+namespace esphome::datetime {
 
 class DateTimeBase : public EntityBase {
  public:
@@ -37,5 +36,4 @@ class DateTimeStateTrigger : public Trigger<ESPTime> {
   }
 };
 
-}  // namespace datetime
-}  // namespace esphome
+}  // namespace esphome::datetime
diff --git a/esphome/components/datetime/datetime_entity.cpp b/esphome/components/datetime/datetime_entity.cpp
index 8606a47fa..694f9c572 100644
--- a/esphome/components/datetime/datetime_entity.cpp
+++ b/esphome/components/datetime/datetime_entity.cpp
@@ -5,8 +5,7 @@
 
 #include "esphome/core/log.h"
 
-namespace esphome {
-namespace datetime {
+namespace esphome::datetime {
 
 static const char *const TAG = "datetime.datetime_entity";
 
@@ -250,7 +249,6 @@ bool OnDateTimeTrigger::matches_(const ESPTime &time) const {
 }
 #endif
 
-}  // namespace datetime
-}  // namespace esphome
+}  // namespace esphome::datetime
 
 #endif  // USE_DATETIME_TIME
diff --git a/esphome/components/datetime/datetime_entity.h b/esphome/components/datetime/datetime_entity.h
index 43bff5a18..018346b34 100644
--- a/esphome/components/datetime/datetime_entity.h
+++ b/esphome/components/datetime/datetime_entity.h
@@ -10,8 +10,7 @@
 
 #include "datetime_base.h"
 
-namespace esphome {
-namespace datetime {
+namespace esphome::datetime {
 
 #define LOG_DATETIME_DATETIME(prefix, type, obj) \
   if ((obj) != nullptr) { \
@@ -146,7 +145,6 @@ class OnDateTimeTrigger : public Trigger<>, public Component, public Parented<Da
 };
 #endif
 
-}  // namespace datetime
-}  // namespace esphome
+}  // namespace esphome::datetime
 
 #endif  // USE_DATETIME_DATETIME
diff --git a/esphome/components/datetime/time_entity.cpp b/esphome/components/datetime/time_entity.cpp
index 469be077e..0e71c9523 100644
--- a/esphome/components/datetime/time_entity.cpp
+++ b/esphome/components/datetime/time_entity.cpp
@@ -5,8 +5,7 @@
 
 #include "esphome/core/log.h"
 
-namespace esphome {
-namespace datetime {
+namespace esphome::datetime {
 
 static const char *const TAG = "datetime.time_entity";
 
@@ -152,7 +151,6 @@ bool OnTimeTrigger::matches_(const ESPTime &time) const {
 }
 #endif
 
-}  // namespace datetime
-}  // namespace esphome
+}  // namespace esphome::datetime
 
 #endif  // USE_DATETIME_TIME
diff --git a/esphome/components/datetime/time_entity.h b/esphome/components/datetime/time_entity.h
index c5cbeb52d..d3be3130b 100644
--- a/esphome/components/datetime/time_entity.h
+++ b/esphome/components/datetime/time_entity.h
@@ -10,8 +10,7 @@
 
 #include "datetime_base.h"
 
-namespace esphome {
-namespace datetime {
+namespace esphome::datetime {
 
 #define LOG_DATETIME_TIME(prefix, type, obj) \
   if ((obj) != nullptr) { \
@@ -125,7 +124,6 @@ class OnTimeTrigger : public Trigger<>, public Component, public Parented<TimeEn
 };
 #endif
 
-}  // namespace datetime
-}  // namespace esphome
+}  // namespace esphome::datetime
 
 #endif  // USE_DATETIME_TIME