diff --git a/README.md b/README.md
index c0d736b..f3185e6 100644
--- a/README.md
+++ b/README.md
@@ -66,4 +66,17 @@ Below is a table representing the various OBD data required, as well as how ofte
 The daemon task is structured as shown in the diagram above. Each data collected is subsequently placed
 in a queue, before being written in the SD card.
 
+Let's detail the methods of the most important script files.
+
+### customized_DateAndTime.h/cpp
+
+|Method|Description|
+|:----:|:---------:|
+|`time_t StringToDatetime(char *str)`|It converts the date and time from string format to time_t type|
+|`void UpdateTime(void)`|It updates time of the RTC|
+|`void SetSysInstance(FreematicsESP32* sys)`|It mappes the devices in memory|
+|`void GetCurrentTime(char* isoTime)`|It gives the current date and time in string format|
+|`void GetCurrentGPSTime(char* isoTime)`|It gives the current time according to GPS|
+|`int GetShiftTime(char* tm1,char* tm2)`|It returnes the shift between two time stamps in seconds|
+
 
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