add deleteallmymessages to tg user bot

util.py

@@ -1,5 +1,11 @@
 from time import strftime, localtime, timezone
 from typing import List
+try:
+    from dateutil.parser import parse
+    have_dateutil = True
+except ImportError:
+    print('Warning: python-dateutil not found. -s and -e only accept integer now.')  # noqa: E501
+    have_dateutil = False
 
 
 def timeToStr(t: int) -> str:
@@ -10,6 +16,16 @@ def timeToStr(t: int) -> str:
     return te
 
 
+def tparse(s: str) -> int:
+    try:
+        return int(s)
+    except Exception:
+        if have_dateutil:
+            return round(parse(s).timestamp())
+        else:
+            raise ValueError()
+
+
 def commandLineToArgv(c: str) -> List[str]:
     s = c.split(' ')
     r = []