Move datetime util to own module

+import pendulum
+
+__all__ = ["parse_dt", "now"]
+
+
+def parse_dt(dt: str, **options) -> pendulum.DateTime:
+    """Parse `dt` and return a datetime object."""
+    return pendulum.parser.parse(dt, **options)
+
+
+def now() -> pendulum.DateTime:
+    """Return the current datetime."""
+    return pendulum.now("UTC")

 from newmath import nb60_re, nbdecode, nbencode, nbrandom
 
 from .. import templating
+from ..dt import now, parse_dt
 from ..response import Status  # noqa
 from ..response import (
     OK,

     return dict(handlers)[best_match](*args, **kwargs)
 
 
-def parse_dt(dt: str, **options) -> pendulum.datetime.DateTime:
-    """Parse `dt` and return a datetime object."""
-    return pendulum.parser.parse(dt, **options)
-
-
-def now() -> pendulum.datetime.DateTime:
-    """Return the current datetime."""
-    return pendulum.now("UTC")
-
-
-def utcnow():  # TODO XXX
-    print(" USE NOW() INSTEAD ")
-    return now()
-
-
 _punct_re = r'[\t !"#$%&\'()*\-/<=>?@\[\\\]^_`{|},.]+'
 _punct_split = re.compile(_punct_re).split
 

 import datetime
 import email
 
+from ..dt import now
 from .util import Header
 
 __all__ = [

 
     def __init__(self, when):
         # FIXME either seconds a la TTL or datetime according to W3C
-        now = datetime.datetime.utcnow()
+        now = web.now()
         if isinstance(when, str):
             try:
                 when = int(when)