fs/FileInfo: use std::chrono::system_clock

src/PlaylistFile.cxx

@@ -148,7 +148,7 @@ LoadPlaylistFileInfo(PlaylistInfo &info,
 		return false;
 
 	info.name = std::move(name_utf8);
-	info.mtime = fi.GetModificationTime();
+	info.mtime = std::chrono::system_clock::to_time_t(fi.GetModificationTime());
 	return true;
 }
 

src/SongUpdate.cxx

@@ -151,7 +151,7 @@ DetachedSong::LoadFile(Path path)
 	if (!tag_file_scan(path, tag_builder))
 		return false;
 
-	mtime = fi.GetModificationTime();
+	mtime = std::chrono::system_clock::to_time_t(fi.GetModificationTime());
 	tag_builder.Commit(tag);
 	return true;
 }

src/db/plugins/simple/SimpleDatabasePlugin.cxx

@@ -157,7 +157,7 @@ SimpleDatabase::Load()
 
 	FileInfo fi;
 	if (GetFileInfo(path, fi))
-		mtime = fi.GetModificationTime();
+		mtime = std::chrono::system_clock::to_time_t(fi.GetModificationTime());
 }
 
 void
@@ -358,7 +358,7 @@ SimpleDatabase::Save()
 
 	FileInfo fi;
 	if (GetFileInfo(path, fi))
-		mtime = fi.GetModificationTime();
+		mtime = std::chrono::system_clock::to_time_t(fi.GetModificationTime());
 }
 
 void

src/fs/FileInfo.hxx

@@ -24,14 +24,16 @@
 #include "Path.hxx"
 #include "system/Error.hxx"
 
-#include <stdint.h>
-
 #ifdef WIN32
 #include <fileapi.h>
 #else
 #include <sys/stat.h>
 #endif
 
+#include <chrono>
+
+#include <stdint.h>
+
 #ifdef WIN32
 
 static inline constexpr uint64_t
@@ -47,6 +49,13 @@ FileTimeToTimeT(FILETIME ft)
 		- 116444736000000000) / 10000000;
 }
 
+static std::chrono::system_clock::time_point
+FileTimeToChrono(FILETIME ft)
+{
+	// TODO: eliminate the time_t roundtrip, preserve sub-second resolution
+	return std::chrono::system_clock::from_time_t(FileTimeToTimeT(ft));
+}
+
 #endif
 
 class FileInfo {
@@ -100,11 +109,11 @@ public:
 #endif
 	}
 
-	time_t GetModificationTime() const {
+	std::chrono::system_clock::time_point GetModificationTime() const {
 #ifdef WIN32
-		return FileTimeToTimeT(data.ftLastWriteTime);
+		return FileTimeToChrono(data.ftLastWriteTime);
 #else
-		return st.st_mtime;
+		return std::chrono::system_clock::from_time_t(st.st_mtime);
 #endif
 	}
 

src/storage/plugins/LocalStorage.cxx

@@ -86,7 +86,7 @@ Stat(Path path, bool follow)
 		info.type = StorageFileInfo::Type::OTHER;
 
 	info.size = src.GetSize();
-	info.mtime = src.GetModificationTime();
+	info.mtime = std::chrono::system_clock::to_time_t(src.GetModificationTime());
 #ifdef WIN32
 	info.device = info.inode = 0;
 #else