diff --git a/boards/arm/stm32/stm32f411-minimum/configs/composite/defconfig b/boards/arm/stm32/stm32f411-minimum/configs/composite/defconfig
index df298c23ba3e5..706e38fa1ee76 100644
--- a/boards/arm/stm32/stm32f411-minimum/configs/composite/defconfig
+++ b/boards/arm/stm32/stm32f411-minimum/configs/composite/defconfig
@@ -43,8 +43,8 @@ CONFIG_RAM_START=0x20000000
 CONFIG_RAW_BINARY=y
 CONFIG_RR_INTERVAL=200
 CONFIG_SCHED_WAITPID=y
-CONFIG_START_DAY=02
-CONFIG_START_MONTH=04
+CONFIG_START_DAY=2
+CONFIG_START_MONTH=4
 CONFIG_START_YEAR=2023
 CONFIG_STM32F411MINIMUM_FLASH=y
 CONFIG_STM32_FLASH_CONFIG_E=y
diff --git a/boards/arm/stm32/stm32f411-minimum/configs/nsh/defconfig b/boards/arm/stm32/stm32f411-minimum/configs/nsh/defconfig
index 77be8d7cc1f53..59fcba16d8334 100644
--- a/boards/arm/stm32/stm32f411-minimum/configs/nsh/defconfig
+++ b/boards/arm/stm32/stm32f411-minimum/configs/nsh/defconfig
@@ -35,8 +35,8 @@ CONFIG_RAM_START=0x20000000
 CONFIG_RAW_BINARY=y
 CONFIG_RR_INTERVAL=200
 CONFIG_SCHED_WAITPID=y
-CONFIG_START_DAY=06
-CONFIG_START_MONTH=06
+CONFIG_START_DAY=6
+CONFIG_START_MONTH=6
 CONFIG_START_YEAR=2020
 CONFIG_STM32_FLASH_CONFIG_E=y
 CONFIG_STM32_JTAG_SW_ENABLE=y
diff --git a/boards/arm/stm32/stm32f411-minimum/configs/spifsnsh/defconfig b/boards/arm/stm32/stm32f411-minimum/configs/spifsnsh/defconfig
index aa1701f59ae6b..5a10f86ee5eba 100644
--- a/boards/arm/stm32/stm32f411-minimum/configs/spifsnsh/defconfig
+++ b/boards/arm/stm32/stm32f411-minimum/configs/spifsnsh/defconfig
@@ -37,8 +37,8 @@ CONFIG_RAM_START=0x20000000
 CONFIG_RAW_BINARY=y
 CONFIG_RR_INTERVAL=200
 CONFIG_SCHED_WAITPID=y
-CONFIG_START_DAY=02
-CONFIG_START_MONTH=04
+CONFIG_START_DAY=2
+CONFIG_START_MONTH=4
 CONFIG_START_YEAR=2023
 CONFIG_STM32F411MINIMUM_FLASH=y
 CONFIG_STM32_FLASH_CONFIG_E=y
diff --git a/boards/arm/stm32/stm32f411-minimum/configs/usbmsc/defconfig b/boards/arm/stm32/stm32f411-minimum/configs/usbmsc/defconfig
index 3b7623cf2d858..c73614163be30 100644
--- a/boards/arm/stm32/stm32f411-minimum/configs/usbmsc/defconfig
+++ b/boards/arm/stm32/stm32f411-minimum/configs/usbmsc/defconfig
@@ -38,8 +38,8 @@ CONFIG_RAM_START=0x20000000
 CONFIG_RAW_BINARY=y
 CONFIG_RR_INTERVAL=200
 CONFIG_SCHED_WAITPID=y
-CONFIG_START_DAY=02
-CONFIG_START_MONTH=04
+CONFIG_START_DAY=2
+CONFIG_START_MONTH=4
 CONFIG_START_YEAR=2023
 CONFIG_STM32F411MINIMUM_FLASH=y
 CONFIG_STM32_FLASH_CONFIG_E=y
diff --git a/boards/risc-v/espressif/esp32c3-generic/configs/timers/defconfig b/boards/risc-v/espressif/esp32c3-generic/configs/timers/defconfig
index c786655827191..221498a024ed9 100644
--- a/boards/risc-v/espressif/esp32c3-generic/configs/timers/defconfig
+++ b/boards/risc-v/espressif/esp32c3-generic/configs/timers/defconfig
@@ -39,7 +39,7 @@ CONFIG_RR_INTERVAL=200
 CONFIG_SCHED_BACKTRACE=y
 CONFIG_SCHED_WAITPID=y
 CONFIG_START_DAY=28
-CONFIG_START_MONTH=03
+CONFIG_START_MONTH=3
 CONFIG_START_YEAR=2023
 CONFIG_SYSTEM_DUMPSTACK=y
 CONFIG_SYSTEM_NSH=y
diff --git a/boards/risc-v/espressif/esp32c6-generic/configs/timers/defconfig b/boards/risc-v/espressif/esp32c6-generic/configs/timers/defconfig
index 991470c0871f2..c36bb8b8b4418 100644
--- a/boards/risc-v/espressif/esp32c6-generic/configs/timers/defconfig
+++ b/boards/risc-v/espressif/esp32c6-generic/configs/timers/defconfig
@@ -40,7 +40,7 @@ CONFIG_RR_INTERVAL=200
 CONFIG_SCHED_BACKTRACE=y
 CONFIG_SCHED_WAITPID=y
 CONFIG_START_DAY=28
-CONFIG_START_MONTH=03
+CONFIG_START_MONTH=3
 CONFIG_START_YEAR=2023
 CONFIG_SYSTEM_DUMPSTACK=y
 CONFIG_SYSTEM_NSH=y
diff --git a/boards/risc-v/espressif/esp32h2-generic/configs/timers/defconfig b/boards/risc-v/espressif/esp32h2-generic/configs/timers/defconfig
index 2f47008ebfb94..afa1b573ca9c6 100644
--- a/boards/risc-v/espressif/esp32h2-generic/configs/timers/defconfig
+++ b/boards/risc-v/espressif/esp32h2-generic/configs/timers/defconfig
@@ -40,7 +40,7 @@ CONFIG_RR_INTERVAL=200
 CONFIG_SCHED_BACKTRACE=y
 CONFIG_SCHED_WAITPID=y
 CONFIG_START_DAY=28
-CONFIG_START_MONTH=03
+CONFIG_START_MONTH=3
 CONFIG_START_YEAR=2023
 CONFIG_SYSTEM_DUMPSTACK=y
 CONFIG_SYSTEM_NSH=y