Drop support for Python 3.6 (#1004)

* Drop support for Python 3.6
* Remove unused time parsing function
* Use Python 3.7 datetime function for writing stats data conversion
* Test against Python 3.10 on macOS and Windows

novelwriter/__init__.py

@@ -209,9 +209,9 @@ def main(sysArgs=None):
     # Check Packages and Versions
     errorData = []
     errorCode = 0
-    if sys.hexversion < 0x030600f0:
+    if sys.hexversion < 0x030700f0:
         errorData.append(
-            "At least Python 3.6 is required, found %s" % CONFIG.verPyString
+            "At least Python 3.7 is required, found %s" % CONFIG.verPyString
         )
         errorCode |= 0x04
     if CONFIG.verQtValue < 50300:

novelwriter/common.py

@@ -241,19 +241,6 @@ def formatTime(tS):
     return "ERROR"
 
 
-def parseTimeStamp(theStamp, default, allowNone=False):
-    """Parses a text representation of a timestamp and converts it into
-    a float. Note that negative timestamps cause an OSError on Windows.
-    See https://bugs.python.org/issue29097
-    """
-    if str(theStamp).lower() == "none" and allowNone:
-        return None
-    try:
-        return datetime.strptime(theStamp, nwConst.FMT_TSTAMP).timestamp()
-    except Exception:
-        return default
-
-
 # =============================================================================================== #
 #  String Functions
 # =============================================================================================== #

novelwriter/core/toodt.py

@@ -330,7 +330,7 @@ class ToOdt(Tokenizer):
 
         # Meta Data
         xMeta = etree.SubElement(self._xMeta, _mkTag("meta", "creation-date"))
-        xMeta.text = datetime.now().strftime(r"%Y-%m-%dT%H:%M:%S")
+        xMeta.text = datetime.now().isoformat(sep="T", timespec="seconds")
 
         xMeta = etree.SubElement(self._xMeta, _mkTag("meta", "generator"))
         xMeta.text = f"novelWriter/{novelwriter.__version__}"

novelwriter/tools/writingstats.py

@@ -457,12 +457,8 @@ class GuiWritingStats(QDialog):
                     if len(inData) < 6:
                         continue
 
-                    dStart = datetime.strptime(
-                        "%s %s" % (inData[0], inData[1]), nwConst.FMT_TSTAMP
-                    )
-                    dEnd = datetime.strptime(
-                        "%s %s" % (inData[2], inData[3]), nwConst.FMT_TSTAMP
-                    )
+                    dStart = datetime.fromisoformat(" ".join(inData[0:2]))
+                    dEnd   = datetime.fromisoformat(" ".join(inData[2:4]))
 
                     sIdle = 0
                     if len(inData) > 6: