Enhancements:

- Added the `title` parameter to `Chart`.

Bug Fixes:
- When passing a timestamp format to `set`, `update`, or `update_from_tick`, the unit is now by default milliseconds rather than nanoseconds.
- When using `update`, if a time is passed that occurs before the current last datapoint, an error will be raised.

docs/source/reference/charts.md

@@ -6,7 +6,7 @@ They inherit from [AbstractChart](#AbstractChart).
 
 ___
 
-`````{py:class} Chart(width: int, height: int, x: int, y: int, screen: int, on_top: bool, maximize: bool, debug: bool, toolbox: bool, inner_width: float, inner_height: float, scale_candles_only: bool)
+`````{py:class} Chart(width: int, height: int, x: int, y: int, title: str, screen: int, on_top: bool, maximize: bool, debug: bool, toolbox: bool, inner_width: float, inner_height: float, scale_candles_only: bool)
 
 The main object used for the normal functionality of lightweight-charts-python, built on the pywebview library.
 

lightweight_charts/abstract.py

@@ -210,7 +210,7 @@ def _series_datetime_format(self, series: pd.Series, exclude_lowercase=None):
 
     def _single_datetime_format(self, arg):
         if isinstance(arg, (str, int, float)) or not pd.api.types.is_datetime64_any_dtype(arg):
-            arg = pd.to_datetime(arg)
+            arg = pd.to_datetime(arg, unit='ms')
         arg = self._interval * (arg.timestamp() // self._interval)+self.offset
         return arg
 
@@ -620,6 +620,11 @@ def update_from_tick(self, series: pd.Series, cumulative_volume: bool = False):
         :param cumulative_volume: Adds the given volume onto the latest bar.
         """
         series = self._series_datetime_format(series)
+        if series['time'] < self._last_bar['time']:
+            raise ValueError(
+                f'Trying to update tick of time "{pd.to_datetime(series["time"])}", '
+                f'which occurs before the last bar time of '
+                f'"{pd.to_datetime(self._last_bar["time"])}".')
         bar = pd.Series()
         if series['time'] == self._last_bar['time']:
             bar = self._last_bar

lightweight_charts/chart.py

@@ -16,7 +16,7 @@ def callback(self, message: str):
 
 class PyWV:
     def __init__(self, q, start_ev, exit_ev, loaded, emit_queue, return_queue, html, debug,
-                 width, height, x, y, screen, on_top, maximize):
+                 width, height, x, y, screen, on_top, maximize, title):
         self.queue = q
         self.return_queue = return_queue
         self.exit = exit_ev
@@ -25,13 +25,13 @@ def __init__(self, q, start_ev, exit_ev, loaded, emit_queue, return_queue, html,
         self.html = html
 
         self.windows = []
-        self.create_window(width, height, x, y, screen, on_top, maximize)
+        self.create_window(width, height, x, y, screen, on_top, maximize, title)
 
         start_ev.wait()
         webview.start(debug=debug)
         self.exit.set()
 
-    def create_window(self, width, height, x, y, screen=None, on_top=False, maximize=False):
+    def create_window(self, width, height, x, y, screen=None, on_top=False, maximize=False, title=''):
         screen = webview.screens[screen] if screen is not None else None
         if maximize:
             if screen is None:
@@ -40,7 +40,7 @@ def create_window(self, width, height, x, y, screen=None, on_top=False, maximize
             else:
                 width, height = screen.width, screen.height
         self.windows.append(webview.create_window(
-            '', html=self.html, js_api=self.callback_api,
+            title, html=self.html, js_api=self.callback_api,
             width=width, height=height, x=x, y=y, screen=screen,
             on_top=on_top,  background_color='#000000'))
         self.windows[-1].events.loaded += lambda: self.loop(self.loaded[len(self.windows)-1])
@@ -73,9 +73,10 @@ class Chart(abstract.AbstractChart):
     _q, _emit_q, _return_q = (mp.Queue() for _ in range(3))
     _loaded_list = [mp.Event() for _ in range(MAX_WINDOWS)]
 
-    def __init__(self, width: int = 800, height: int = 600, x: int = None, y: int = None, screen: int = None,
-                 on_top: bool = False, maximize: bool = False, debug: bool = False, toolbox: bool = False,
-                 inner_width: float = 1.0, inner_height: float = 1.0, scale_candles_only: bool = False):
+    def __init__(self, width: int = 800, height: int = 600, x: int = None, y: int = None, title: str = '',
+                 screen: int = None, on_top: bool = False, maximize: bool = False, debug: bool = False,
+                 toolbox: bool = False, inner_width: float = 1.0, inner_height: float = 1.0,
+                 scale_candles_only: bool = False):
         self._i = Chart._window_num
         self._loaded = Chart._loaded_list[self._i]
         abstract.Window._return_q = Chart._return_q
@@ -89,13 +90,13 @@ def __init__(self, width: int = 800, height: int = 600, x: int = None, y: int =
             self._process = mp.Process(target=PyWV, args=(
                 self._q, self._start, self._exit, Chart._loaded_list,
                 self._emit_q, self._return_q, abstract.TEMPLATE, debug,
-                width, height, x, y, screen, on_top, maximize,
+                width, height, x, y, screen, on_top, maximize, title
             ), daemon=True)
             self._process.start()
         else:
             window.handlers = Chart._main_window_handlers
             super().__init__(window, inner_width, inner_height, scale_candles_only, toolbox)
-            self._q.put(('create_window', (width, height, x, y, screen, on_top, maximize)))
+            self._q.put(('create_window', (width, height, x, y, screen, on_top, maximize, title)))
 
     def show(self, block: bool = False):
         """

setup.py

@@ -5,7 +5,7 @@
 
 setup(
     name='lightweight_charts',
-    version='1.0.18.5',
+    version='1.0.18.6',
     packages=find_packages(),
     python_requires='>=3.8',
     install_requires=[