Merge pull request datalad#7598 from yarikoptic/bf-dtime

BF: tools/dtime to handle log line having non-increment timestamp

tools/dtime

@@ -15,6 +15,7 @@ reg = re.compile('^\d{4}-\d{2}-\d{1,2} \d{1,2}:\d{1,2}:\d{1,2},\d{1,3}')
 prevt = None
 maxl = 0
 prevl = None
+warned_negative = False
 
 if len(sys.argv) <= 1:
     in_ = sys.stdin
@@ -30,7 +31,14 @@ for l in in_:
         t = datetime.strptime(l[:end], '%Y-%m-%d %H:%M:%S,%f')
         if prevt is not None:
             dt = t - prevt
-            ms = dt.microseconds // 1000 + dt.seconds*1000
+            secs = dt.total_seconds()
+            # negative dt has very weird form of -1 day + huge number of seconds
+            if secs < 0:
+                if not warned_negative:
+                    sys.stderr.write(f"Negative delta of {secs} seconds detected.  Might be due to threading etc\n")
+                    warned_negative = True
+
+            ms = secs * 1000
             dtstr = ("%5d" % ms if ms else '    0')
 
             maxl = max(maxl, len(dtstr))