Convert HHmm to Fallout game-hour float

Add parsing and application of HHmm time strings as Fallout game-hour floats so GUI time presets apply correctly. Introduce ParseHHmmToGameHour in plugin/src/F4TWorldStateSync.cpp and use it when building the console command (formats as set gamehour to <float> with fallback to the raw HHmm string if parsing fails). Improve logging to indicate when a parsed HHmm was used. Update protocol/server-world-state.md, changelog.md, and docs/dev-log.md to document the behavior and rationale.

changelog.md

@@ -24,6 +24,7 @@ For testing notes, milestone summaries, known issues, and next steps, see [`docs
 - Plugin now defers server weather commands until player assignment is available, preventing initial GUI clicks from being dropped right after connect.
 - Replaced invalid default GUI weather IDs with valid Fallout 4 weather form IDs so `fw <id>` no longer fails with "Invalid weather ...".
 - Corrected `Clear` preset ID typo from `0002852a` to valid `0002b52a` (`CommonwealthClear`).
+- Time apply now converts `timeHHmm` to Fallout game-hour float before executing `set gamehour`, fixing 2200-style values applying incorrectly.
 
 ### Changed
 - Weather presets store the exact `fw` console argument (8-digit hex); edit `server/world_state_presets.py` only if a preset ID fails in your console.

docs/dev-log.md

@@ -9,6 +9,36 @@ failed experiments, successful tests, and next steps.
 
 ---
 
+## 2026-06-24 - Convert `HHmm` Time to Game-Hour Float
+
+### Summary
+Fixed server GUI time presets applying the wrong time in Fallout 4 by converting `HHmm` values (such as `2200`) to game-hour float values before running `set gamehour`.
+
+### Files Changed
+- `plugin/src/F4TWorldStateSync.cpp`
+- `protocol/server-world-state.md`
+- `changelog.md`
+
+### Details
+- `serverWorldState.timeHHmm` is now parsed as `HHmm` on the client.
+- Parsed times are applied as float hours:
+  - `2200` -> `22.0`
+  - `1830` -> `18.5`
+- If parsing fails, plugin falls back to the original raw command for compatibility.
+
+### Testing
+- Not re-tested in-game in this session.
+- User reported `Night (2200)` previously set daytime while console showed `set gamehour to 2200`.
+- Recommended: test `0600`, `1200`, `1900`, and `2200` from GUI and verify resulting in-game time.
+
+### Known Issues
+- None currently known.
+
+### Next Steps
+- Rebuild plugin and verify each time preset maps correctly in-game.
+
+---
+
 ## 2026-06-24 - Replace Invalid GUI Weather IDs
 
 ### Summary

plugin/src/F4TWorldStateSync.cpp

@@ -195,6 +195,47 @@ namespace
 		return value;
 	}
 
+	std::optional<float> ParseHHmmToGameHour(std::string_view a_hhmm)
+	{
+		if (a_hhmm.empty() || a_hhmm.size() > 4) {
+			return std::nullopt;
+		}
+
+		std::string digits;
+		digits.reserve(4);
+		for (const auto ch : a_hhmm) {
+			if (ch < '0' || ch > '9') {
+				return std::nullopt;
+			}
+			digits.push_back(ch);
+		}
+
+		while (digits.size() < 4) {
+			digits.insert(digits.begin(), '0');
+		}
+
+		int hours = 0;
+		int minutes = 0;
+		{
+			const auto* begin = digits.data();
+			const auto* split = begin + 2;
+			const auto* end = begin + 4;
+
+			const auto hourResult = std::from_chars(begin, split, hours);
+			const auto minuteResult = std::from_chars(split, end, minutes);
+			if (hourResult.ec != std::errc{} || hourResult.ptr != split ||
+				minuteResult.ec != std::errc{} || minuteResult.ptr != end) {
+				return std::nullopt;
+			}
+		}
+
+		if (hours < 0 || hours > 23 || minutes < 0 || minutes > 59) {
+			return std::nullopt;
+		}
+
+		return static_cast<float>(hours) + static_cast<float>(minutes) / 60.0F;
+	}
+
 	bool ForceHostWorldStateBroadcast(std::optional<std::uint32_t> a_forcedWeatherFormId, bool a_sendTime)
 	{
 		if (!F4T::WorldStateSync::IsWorldStateHost() || !F4T::Networking::IsConnectedToServer()) {
@@ -394,7 +435,10 @@ namespace
 	void ApplyServerWorldState(const F4T::WorldStateSync::PendingServerWorldState& a_state)
 	{
 		if (a_state.timeHHmm && !a_state.timeHHmm->empty()) {
-			const auto command = std::format("set gamehour to {}", *a_state.timeHHmm);
+			const auto parsedGameHour = ParseHHmmToGameHour(*a_state.timeHHmm);
+			const auto command = parsedGameHour
+				? std::format("set gamehour to {:.4f}", *parsedGameHour)
+				: std::format("set gamehour to {}", *a_state.timeHHmm);
 			RE::Console::ExecuteCommand(command.c_str());
 
 			float gameHour = 0.0F;
@@ -415,9 +459,16 @@ namespace
 			}
 
 			if (ShouldLog("server_world_state_time_apply")) {
+				if (parsedGameHour) {
+					LogInfo(std::format(
+						"Applied server time command: {} (from HHmm={}).",
+						command,
+						*a_state.timeHHmm));
+				} else {
 					LogInfo(std::format("Applied server time command: {}", command));
 				}
 			}
+		}
 
 		const bool hasWeatherRequest =
 			(a_state.weatherConsoleArg && !a_state.weatherConsoleArg->empty()) ||

protocol/server-world-state.md

@@ -4,7 +4,7 @@ Server-authoritative weather and time control from the dev server GUI.
 
 ## Authority
 
-- **Time** (`timeHHmm`): sent to **all** clients; each runs `set gamehour to HHmm`.
+- **Time** (`timeHHmm`): sent to **all** clients; each converts `HHmm` to Fallout game-hour float (for example `2200 -> 22.0`, `1830 -> 18.5`) before applying.
 - **Weather** (`weatherConsoleArg`): sent to **all** clients, but only **player 1** runs `fw <8-digit-id>`. Player 1 should also be the world-state host so the usual `worldState` relay updates other clients.
 
 ## Packet Format
@@ -35,14 +35,14 @@ Weather (all clients receive; only player 1 acts):
 | Field | Type | Required | Description |
 |-------|------|----------|-------------|
 | `type` | string | yes | Must be `"serverWorldState"` |
-| `timeHHmm` | string | no | 24-hour clock value for `set gamehour to HHmm` |
+| `timeHHmm` | string | no | 24-hour clock value (HHmm) converted client-side to game-hour float for `set gamehour to <float>` |
 | `weatherConsoleArg` | string | no | Exact argument for `fw` on player 1 (8-digit lowercase hex) |
 | `weatherFormId` | string | no | Relay form ID used in host `worldState` broadcast |
 | `serverTime` | number (double) | no | Relay timestamp |
 
 ## Client Apply Rules
 
-- **Time:** all clients apply `set gamehour to HHmm` on the game thread.
+- **Time:** all clients convert `timeHHmm` to game-hour float and apply `set gamehour to <float>` on the game thread.
 - **Weather:** only the client with assigned `playerId == 1` runs `fw <weatherConsoleArg>`.
 - Weather commands are scheduled on the F4SE game thread from the network receive path.
 - After player 1 runs `fw`, the world-state host immediately relays `worldState` with `weatherFormId`.