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+# FC_GetSetLocalTime
+
+**Version:** 1.1  
+**Language:** SCL (Structured Control Language) — Siemens TIA Portal  
+**Return Type:** `Int`
+
+---
+
+## Overview
+
+`FC_GetSetLocalTime` is a reusable function block for Siemens PLCs that provides a unified interface to **read** the current local time or **write** (set) a new local date and time. It wraps the TIA Portal system instructions `RD_LOC_T` and `WR_LOC_T` into a single, easy-to-call function.
+
+---
+
+## Parameters
+
+### Inputs
+
+| Parameter | Type | Description |
+|-----------|------|-------------|
+| `xWrite` | `BOOL` | `FALSE` = Read current local time. `TRUE` = Write a new local time. |
+| `dtLocal` | `DTL` | When **writing**: pass the desired new date/time here. When **reading**: this parameter receives the current date/time as output. |
+
+> **Note:** `dtLocal` acts as both an input and output depending on the mode selected by `xWrite`.
+
+### Outputs
+
+| Parameter | Type | Description |
+|-----------|------|-------------|
+| `xDone` | `BOOL` | Set to `TRUE` when the operation completes without error. |
+| `xError` | `BOOL` | Set to `TRUE` when the operation fails. |
+| `wStatus` | `WORD` | Detailed status or error code returned by the system instruction (e.g., `16#0000` = no error). |
+
+### Return Value
+
+| Value | Meaning |
+|-------|---------|
+| `0` | Operation successful (OK) |
+| `> 0` | Warning |
+| `< 0` | Error |
+
+---
+
+## How It Works
+
+The function uses a simple `IF/ELSE` branch controlled by the `xWrite` flag:
+
+```
+xWrite = FALSE  →  Calls RD_LOC_T  →  Reads current local time into dtLocal
+xWrite = TRUE   →  Calls WR_LOC_T  →  Writes dtLocal value as new local time
+```
+
+In both cases:
+- If the system instruction returns `ret = 0`, `xDone` is set to `TRUE`.
+- If `ret ≠ 0`, `xError` is set to `TRUE` and `wStatus` holds the error code for diagnostics.
+- The function itself returns `ret` as its integer return value.
+
+---
+
+## Usage Examples
+
+### Read Current Local Time
+
+```scl
+RET_VAL := FC_GetSetLocalTime(
+    xWrite := FALSE,
+    dtLocal => CurrentTime   // CurrentTime will be filled with the current date/time
+);
+```
+
+### Write / Set a New Local Time
+
+```scl
+RET_VAL := FC_GetSetLocalTime(
+    xWrite := TRUE,
+    dtLocal := NewTime       // NewTime contains the desired date/time to set
+);
+```
+
+---
+
+## Error Handling
+
+After calling the function, always check the outputs before proceeding:
+
+```scl
+IF xDone THEN
+    // Operation was successful
+ELSIF xError THEN
+    // Handle error — inspect wStatus for the specific error code
+END_IF;
+```
+
+The `wStatus` word follows standard Siemens status code conventions. A value of `16#0000` indicates no error.
+
+---
+
+## Dependencies
+
+This function relies on the following Siemens TIA Portal system instructions:
+
+| Instruction | Purpose |
+|-------------|---------|
+| `RD_LOC_T` | Reads the current local date and time into a `DTL` variable |
+| `WR_LOC_T` | Writes a new local date and time from a `DTL` variable |
+
+Both instructions are available on S7-1200 and S7-1500 series PLCs.
+
+---
+
+## Data Type Reference — DTL
+
+`DTL` (Date and Time Long) is a Siemens-specific data type that stores date and time with nanosecond precision.
+
+| Field | Type | Description |
+|-------|------|-------------|
+| `YEAR` | `UINT` | Year (e.g., 2024) |
+| `MONTH` | `USINT` | Month (1–12) |
+| `DAY` | `USINT` | Day (1–31) |
+| `WEEKDAY` | `USINT` | Day of week (1=Sunday … 7=Saturday) |
+| `HOUR` | `USINT` | Hour (0–23) |
+| `MINUTE` | `USINT` | Minute (0–59) |
+| `SECOND` | `USINT` | Second (0–59) |
+| `NANOSECOND` | `UDINT` | Nanoseconds (0–999,999,999) |
+
+---
+
+## Notes
+
+- The function resets `xDone`, `xError`, and `wStatus` at the **start of every call**, so outputs always reflect the most recent execution.
+- Only one operation (read or write) is performed per function call.
+- This function does **not** handle time zone conversion — it works with the local time as configured on the PLC.
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