fix the document of TO_DATE, TO_DAYS, year_floor, WEEKS_ADD, WEEKS_DIFF, WEEKS_SUB function

docs/sql-manual/sql-functions/scalar-functions/date-time-functions/to-date.md

@@ -24,25 +24,29 @@ specific language governing permissions and limitations
 under the License.
 -->
 
-## to_date
-### description
-#### Syntax
 
-`DATE TO_DATE(DATETIME)`
+## Description
+Date conversion function, used to convert a date time string or timestamp to a date type (DATE), that is, remove the time part and keep only the date (YYYY-MM-DD)
 
-Return the DATE part of DATETIME value.
+## Syntax
+```sql
+TO_DATE(<datetime_value>)
+```
+
+## Required parameter
+**datetime_value**: datetime type datetime
 
-### example
+## Example
 
+Convert `2020-02-02 00:00:00` to `2020-02-02`
+```sql
+select to_date("2020-02-02 00:00:00");
 ```
-mysql> select to_date("2020-02-02 00:00:00");
+```text
 +--------------------------------+
 | to_date('2020-02-02 00:00:00') |
 +--------------------------------+
 | 2020-02-02                     |
 +--------------------------------+
 ```
 
-### keywords
-
-    TO_DATE

docs/sql-manual/sql-functions/scalar-functions/date-time-functions/to-days.md

@@ -24,27 +24,45 @@ specific language governing permissions and limitations
 under the License.
 -->
 
-## to_days
-### Description
-#### Syntax
 
-`INT TO DAYS`
+## Description
+Date calculation function, which is used to convert a date into a day value, that is, to calculate the total number of days from December 31, 0 AD (the base date) to the specified date.
 
+## Syntax
 
-Days of returning date distance 0000-01-01
+```sql
+TO_DAYS([<datetime_value> | <date_value>])
+```
+
+## Optional parameters
+1. **<datetime_value>**
+> datetime type datetime
+
+2. **<date_value>**
+> date type datetime
 
-The parameter is Date or Datetime type
 
-### example
+## Example
 
+Query how many days are there since October 7, 2007
+```sql
+select to_days('2007-10-07');
 ```
-mysql> select to_days('2007-10-07');
-+-----------------------+
-| to_days('2007-10-07') |
-+-----------------------+
-|                733321 |
-+-----------------------+
+```text
++---------------------------------------+
+| to_days(cast('2007-10-07' as DATEV2)) |
++---------------------------------------+
+|                                733321 |
++---------------------------------------+
 ```
 
-### keywords
-    TO_DAYS,TO,DAYS
+```sql
+select to_days('2007-10-07 10:03:09');
+```
+```text
++------------------------------------------------+
+| to_days(cast('2007-10-07 10:03:09' as DATEV2)) |
++------------------------------------------------+
+|                                         733321 |
++------------------------------------------------+
+```

docs/sql-manual/sql-functions/scalar-functions/date-time-functions/weeks-add.md

@@ -24,27 +24,63 @@ specific language governing permissions and limitations
 under the License.
 -->
 
-## weeks_add
-### description
-#### Syntax
+## Description
+This function is used to add (or subtract) a certain number of weeks from a specified date or time value.
 
-`DATETIME WEEKS_ADD(DATETIME date, INT weeks)`
+## Syntax
 
-ADD a specified number of weeks from a datetime or date
+```sql
+WEEKS_ADD([<date_value> | <datetime_value>], <weeks_value>)
+```
 
-The parameter date can be DATETIME or DATE, and the return type is consistent with that of the parameter date.
+## Required parameters
+**<weeks_value>**
+> Integer, indicating the number of weeks to increase or decrease (positive number indicates increase, negative number indicates decrease)
 
-### example
+## Optional parameters
+- **<date_value>**
+    > `DATE` date type input value
 
-```
-mysql> select weeks_add("2020-02-02 02:02:02", 1);
-+-------------------------------------+
-| weeks_add('2020-02-02 02:02:02', 1) |
-+-------------------------------------+
-| 2020-02-09 02:02:02                 |
-+-------------------------------------+
-```
+- **<datetime_value>**
+    > `DATETIME` time type input value
+
+## example
+
+
+1. Add one week to the time `2020-02-02 02:02:02`
+    ```sql
+    select weeks_add("2020-02-02 02:02:02", 1);
+    ```
+    ```text
+      +-------------------------------------+
+      | weeks_add('2020-02-02 02:02:02', 1) |
+      +-------------------------------------+
+      | 2020-02-09 02:02:02                 |
+      +-------------------------------------+
+    ```
+
+2. Subtract one week from the time `2020-02-02 02:02:02`
+    ```sql
+    select weeks_add("2020-02-02 02:02:02", -1);
+    ```
+    ```text
+    +-------------------------------------------------------------+
+    | weeks_add(cast('2020-02-02 02:02:02' as DATETIMEV2(0)), -1) |
+    +-------------------------------------------------------------+
+    | 2020-01-26 02:02:02                                         |
+    +-------------------------------------------------------------+
+    ```
+
+3. Add one week to the date `2020-02-02`
+    ```sql
+    select weeks_add("2020-02-02", 1);
+    ```
+    ```text
+    +--------------------------------------------+
+    | weeks_add(cast('2020-02-02' as DATEV2), 1) |
+    +--------------------------------------------+
+    | 2020-02-09                                 |
+    +--------------------------------------------+
+    ```
 
-### keywords
 
-    WEEKS_ADD

docs/sql-manual/sql-functions/scalar-functions/date-time-functions/weeks-diff.md

@@ -24,25 +24,58 @@ specific language governing permissions and limitations
 under the License.
 -->
 
-## weeks_diff
-### description
-#### Syntax
+## Description
+Calculates the number of complete weeks (in 7-day units) between two date or time values.
 
-`INT weeks_diff(DATETIME enddate, DATETIME startdate)`
+## Syntax
 
-The difference between the start time and the end time is weeks
+```sql
+WEEKS_DIFF([<end_date> | <end_datetime>], [<start_date> | <start_datetime>])
+```
 
-### example
+## Optional parameters
+| Parameter name | Data type | Description |
+|----------------------|------------|----------------------|
+| **`end_date`** | `DATE` | Later date |
+| **`end_datetime`** | `DATETIME` | Later datetime |
+| **`start_date`** | `DATE` | Earlier date |
+| **`start_datetime`** | `DATETIME` | Earlier datetime |
 
-```
-mysql> select weeks_diff('2020-12-25','2020-10-25');
-+----------------------------------------------------------+
-| weeks_diff('2020-12-25 00:00:00', '2020-10-25 00:00:00') |
-+----------------------------------------------------------+
-|                                                        8 |
-+----------------------------------------------------------+
-```
 
-### keywords
+## Example
+
+1. How many weeks are there between `2020-12-25` and `2020-10-25`
+    ```sql
+    select weeks_diff('2020-12-25','2020-10-25');
+    ```
+    ```text
+    +----------------------------------------------------------+
+    | weeks_diff('2020-12-25 00:00:00', '2020-10-25 00:00:00') |
+    +----------------------------------------------------------+
+    |                                                        8 |
+    +----------------------------------------------------------+
+    ```
+
+2. How many weeks are there between `2020-12-25 10:10:02` and `2020-10-25 12:10:02`
+    ```sql
+    select weeks_diff('2020-12-25 10:10:02','2020-10-25 12:10:02');
+    ```
+    ```text
+    +--------------------------------------------------------------------------------------------------------+
+    | weeks_diff(cast('2020-12-25 10:10:02' as DATETIMEV2(0)), cast('2020-10-25 12:10:02' as DATETIMEV2(0))) |
+    +--------------------------------------------------------------------------------------------------------+
+    |                                                                                                      8 |
+    +--------------------------------------------------------------------------------------------------------+
+    ```
 
-    weeks_diff
+3. How many weeks are there between `2020-12-25 10:10:02` and `2020-10-25`
+    ```sql
+    select weeks_diff('2020-12-25 10:10:02','2020-10-25');
+    ```
+    ```text
+    +----------------------------------------------------------------------------------------+
+    | weeks_diff(cast('2020-12-25 10:10:02' as DATETIMEV2(0)), cast('2020-10-25' as DATEV2)) |
+    +----------------------------------------------------------------------------------------+
+    |                                                                                      8 |
+    +----------------------------------------------------------------------------------------+
+    ```

docs/sql-manual/sql-functions/scalar-functions/date-time-functions/weeks-sub.md

@@ -24,27 +24,47 @@ specific language governing permissions and limitations
 under the License.
 -->
 
-## weeks_sub
-### description
-#### Syntax
 
-`DATETIME WEEKS_SUB(DATETIME date, INT weeks)`
+## Description
+## Syntax
+```sql
+WEEKS_SUB([<date_value> | <datetime_value>], <week_period>)
+```
 
-Subtracts a specified number of weeks from a datetime or date
+## Required parameters
+**<week_period>**
+> Integer representing the number of weeks to be reduced (positive number means reduction, negative number means increase).
 
-The parameter date can be DATETIME or DATE, and the return type is consistent with that of the parameter date.
+## Optional parameters
+- **<date_value>**
+    > Date input value of type `DATE`
 
-### example
+- **<datetime_value>**
+    > Date and time input value of type `DATETIME`
 
-```
-mysql> select weeks_sub("2020-02-02 02:02:02", 1);
-+-------------------------------------+
-| weeks_sub('2020-02-02 02:02:02', 1) |
-+-------------------------------------+
-| 2020-01-26 02:02:02                 |
-+-------------------------------------+
-```
 
-### keywords
+## Example
+
+1. Subtract one week from the datetime `2020-02-02 02:02:02`
+    ```sql
+    select weeks_sub("2020-02-02 02:02:02", 1);
+    ```
+    ```text
+    +-------------------------------------+
+    | weeks_sub('2020-02-02 02:02:02', 1) |
+    +-------------------------------------+
+    | 2020-01-26 02:02:02                 |
+    +-------------------------------------+
+    ```
 
-    WEEKS_SUB
+2. Subtract one week from the date `2020-02-02`
+    ```sql
+    select weeks_sub("2020-02-02", 1);
+    ```
+    ```text
+    +--------------------------------------------+
+    | weeks_sub(cast('2020-02-02' as DATEV2), 1) |
+    +--------------------------------------------+
+    | 2020-01-26                                 |
+    +--------------------------------------------+
+    ```