Make it possible to configure the timestamp format.

doc/help/settings.asciidoc

@@ -60,6 +60,7 @@
 |==============
 |Setting|Description
 |<<completion-download-path-suggestion,download-path-suggestion>>|What to display in the download filename input.
+|<<completion-timestamp-format,timestamp-format>>|How to format timestamps (e.g. for history)
 |<<completion-show,show>>|Whether to show the autocompletion window.
 |<<completion-height,height>>|The height of the completion, in px or as percentage of the window.
 |<<completion-history-length,history-length>>|How many commands to save in the history.
@@ -615,6 +616,12 @@ Valid values:
 
 Default: +pass:[path]+
 
+[[completion-timestamp-format]]
+=== timestamp-format
+How to format timestamps (e.g. for history)
+
+Default: +pass:[%Y-%m-%d]+
+
 [[completion-show]]
 === show
 Whether to show the autocompletion window.

qutebrowser/completion/models/urlmodel.py

@@ -19,11 +19,14 @@
 
 """CompletionModels for URLs."""
 
+import datetime
+
 from PyQt5.QtCore import pyqtSlot
 from PyQt5.QtGui import QStandardItem
 
 from qutebrowser.utils import objreg
 from qutebrowser.completion.models import base
+from qutebrowser.config import config
 
 
 class UrlCompletionModel(base.BaseCompletionModel):
@@ -48,10 +51,27 @@ class UrlCompletionModel(base.BaseCompletionModel):
 
         for entry in self._history:
             atime = int(entry.atime)
-            self.new_item(self._history_cat, entry.url, "", str(atime),
-                          sort=atime)
+            self.new_item(self._history_cat, entry.url, "",
+                          self._fmt_atime(atime), sort=atime)
 
         self._history.item_added.connect(self.on_history_item_added)
+        objreg.get('config').changed.connect(self.reformat_timestamps)
+
+    def _fmt_atime(self, atime):
+        """Format an atime to a human-readable string."""
+        fmt = config.get('completion', 'timestamp-format')
+        if fmt is None:
+            return ''
+        return datetime.datetime.fromtimestamp(atime).strftime(fmt)
+
+    @config.change_filter('completion', 'timestamp-format')
+    def reformat_timestamps(self):
+        """Reformat the timestamps if the config option was changed."""
+        for i in range(self._history_cat.rowCount()):
+            name_item = self._history_cat.child(i, 0)
+            atime_item = self._history_cat.child(i, 2)
+            atime = int(name_item.data(base.Role.sort))
+            atime_item.setText(self._fmt_atime(atime))
 
     @pyqtSlot(object)
     def on_history_item_added(self, item):
@@ -64,10 +84,10 @@ class UrlCompletionModel(base.BaseCompletionModel):
                     if not name:
                         continue
                     if name.text() == item.url:
-                        self._history_cat.setChild(i, 2,
-                                                   QStandardItem(str(atime)))
+                        self._history_cat.setChild(
+                            i, 2, QStandardItem(self._fmt_atime(atime)))
                         name.setData(str(atime), base.Role.sort)
                         break
             else:
-                self.new_item(self._history_cat, item.url, "", str(atime),
-                              sort=atime)
+                self.new_item(self._history_cat, item.url, "",
+                              self._fmt_atime(atime), sort=atime)

qutebrowser/config/configdata.py

@@ -309,6 +309,10 @@ DATA = collections.OrderedDict([
          SettingValue(typ.DownloadPathSuggestion(), 'path'),
          "What to display in the download filename input."),
 
+        ('timestamp-format',
+         SettingValue(typ.String(none_ok=True), '%Y-%m-%d'),
+         "How to format timestamps (e.g. for history)"),
+
         ('show',
          SettingValue(typ.Bool(), 'true'),
          "Whether to show the autocompletion window."),