19 files changed, 280 insertions, 257 deletions
diff --git a/gnu/packages/calendar.scm b/gnu/packages/calendar.scm
index 23e2da05ea..159e606a24 100644
--- a/gnu/packages/calendar.scm
+++ b/gnu/packages/calendar.scm
@@ -38,6 +38,7 @@
   #:use-module (gnu packages icu4c)
   #:use-module (gnu packages perl)
   #:use-module (gnu packages python)
+  #:use-module (gnu packages time)
   #:use-module (srfi srfi-26))
 
 (define-public libical
diff --git a/gnu/packages/check.scm b/gnu/packages/check.scm
index 149a276316..5a926eb596 100644
--- a/gnu/packages/check.scm
+++ b/gnu/packages/check.scm
@@ -50,6 +50,7 @@
   #:use-module (gnu packages compression)
   #:use-module (gnu packages python)
   #:use-module (gnu packages python-web)
+  #:use-module (gnu packages time)
   #:use-module (guix utils)
   #:use-module ((guix licenses) #:prefix license:)
   #:use-module (guix packages)
diff --git a/gnu/packages/django.scm b/gnu/packages/django.scm
index 6b71092ac7..bbf231ab53 100644
--- a/gnu/packages/django.scm
+++ b/gnu/packages/django.scm
@@ -29,7 +29,8 @@
   #:use-module (gnu packages databases)
   #:use-module (gnu packages check)
   #:use-module (gnu packages python)
-  #:use-module (gnu packages python-web))
+  #:use-module (gnu packages python-web)
+  #:use-module (gnu packages time))
 
 (define-public python-django
   (package
diff --git a/gnu/packages/ebook.scm b/gnu/packages/ebook.scm
index 8cf977cff3..7d34bfafac 100644
--- a/gnu/packages/ebook.scm
+++ b/gnu/packages/ebook.scm
@@ -47,6 +47,7 @@
   #:use-module (gnu packages python-web)
   #:use-module (gnu packages qt)
   #:use-module (gnu packages serialization)
+  #:use-module (gnu packages time)
   #:use-module (gnu packages tls)
   #:use-module (gnu packages web)
   #:use-module (gnu packages xml)
diff --git a/gnu/packages/gnome.scm b/gnu/packages/gnome.scm
index 33d4c7d8e8..25e0e8fe31 100644
--- a/gnu/packages/gnome.scm
+++ b/gnu/packages/gnome.scm
@@ -122,6 +122,7 @@
   #:use-module (gnu packages compression)
   #:use-module (gnu packages spice)
   #:use-module (gnu packages tex)
+  #:use-module (gnu packages time)
   #:use-module (gnu packages tls)
   #:use-module (gnu packages web)
   #:use-module (gnu packages webkit)
diff --git a/gnu/packages/irc.scm b/gnu/packages/irc.scm
index 120bdc4371..e1ceb508bb 100644
--- a/gnu/packages/irc.scm
+++ b/gnu/packages/irc.scm
@@ -56,6 +56,7 @@
   #:use-module (gnu packages ruby)
   #:use-module (gnu packages qt)
   #:use-module (gnu packages tcl)
+  #:use-module (gnu packages time)
   #:use-module (gnu packages tls)
   #:use-module (gnu packages web))
 
diff --git a/gnu/packages/jrnl.scm b/gnu/packages/jrnl.scm
index d4c41d5b9e..ec9e20681c 100644
--- a/gnu/packages/jrnl.scm
+++ b/gnu/packages/jrnl.scm
@@ -25,7 +25,8 @@
   #:use-module (guix build-system python)
   #:use-module (gnu packages check)
   #:use-module (gnu packages python)
-  #:use-module (gnu packages python-crypto))
+  #:use-module (gnu packages python-crypto)
+  #:use-module (gnu packages time))
 
 (define-public jrnl
   (package
diff --git a/gnu/packages/mail.scm b/gnu/packages/mail.scm
index 1e13bb0afd..77d935171a 100644
--- a/gnu/packages/mail.scm
+++ b/gnu/packages/mail.scm
@@ -96,6 +96,7 @@
   #:use-module (gnu packages samba)
   #:use-module (gnu packages screen)
   #:use-module (gnu packages tcl)
+  #:use-module (gnu packages time)
   #:use-module (gnu packages tls)
   #:use-module (gnu packages networking)
   #:use-module (gnu packages web)
diff --git a/gnu/packages/openstack.scm b/gnu/packages/openstack.scm
index 6745b203ba..31922833b7 100644
--- a/gnu/packages/openstack.scm
+++ b/gnu/packages/openstack.scm
@@ -25,6 +25,7 @@
   #:use-module (gnu packages python-crypto)
   #:use-module (gnu packages python-web)
   #:use-module (gnu packages ssh)
+  #:use-module (gnu packages time)
   #:use-module (gnu packages tls)
   #:use-module (gnu packages version-control)
   #:use-module (guix build-system python)
diff --git a/gnu/packages/package-management.scm b/gnu/packages/package-management.scm
index 9d178aae60..1570992b26 100644
--- a/gnu/packages/package-management.scm
+++ b/gnu/packages/package-management.scm
@@ -58,6 +58,7 @@
   #:use-module (gnu packages popt)
   #:use-module (gnu packages gnuzilla)
   #:use-module (gnu packages cpio)
+  #:use-module (gnu packages time)
   #:use-module (gnu packages tls)
   #:use-module (gnu packages ssh)
   #:use-module (gnu packages vim)
diff --git a/gnu/packages/python-crypto.scm b/gnu/packages/python-crypto.scm
index ebb6e0617f..77409d86d2 100644
--- a/gnu/packages/python-crypto.scm
+++ b/gnu/packages/python-crypto.scm
@@ -43,6 +43,7 @@
   #:use-module (gnu packages multiprecision)
   #:use-module (gnu packages protobuf)
   #:use-module (gnu packages python)
+  #:use-module (gnu packages time)
   #:use-module (gnu packages tls)
   #:use-module ((guix licenses) #:prefix license:)
   #:use-module (srfi srfi-1))
diff --git a/gnu/packages/python-web.scm b/gnu/packages/python-web.scm
index 57938d0cfd..12e45b2eff 100644
--- a/gnu/packages/python-web.scm
+++ b/gnu/packages/python-web.scm
@@ -50,6 +50,7 @@
   #:use-module (gnu packages pkg-config)
   #:use-module (gnu packages python)
   #:use-module (gnu packages python-crypto)
+  #:use-module (gnu packages time)
   #:use-module (gnu packages xml)
   #:use-module ((guix licenses) #:prefix license:)
   #:use-module (srfi srfi-1))
diff --git a/gnu/packages/python.scm b/gnu/packages/python.scm
index fd83cf7e0d..d46119718b 100644
--- a/gnu/packages/python.scm
+++ b/gnu/packages/python.scm
@@ -111,6 +111,7 @@
   #:use-module (gnu packages statistics)
   #:use-module (gnu packages tex)
   #:use-module (gnu packages texinfo)
+  #:use-module (gnu packages time)
   #:use-module (gnu packages tls)
   #:use-module (gnu packages version-control)
   #:use-module (gnu packages video)
@@ -469,31 +470,6 @@ pidof, tty, taskset, pmap.")
 (define-public python2-psutil
   (package-with-python2 python-psutil))
 
-(define-public python-pytz
-  (package
-    (name "python-pytz")
-    (version "2017.2")
-    (source
-     (origin
-      (method url-fetch)
-      (uri (pypi-uri "pytz" version ".zip"))
-      (sha256
-       (base32
-        "12cmd3j46d2gcw08bspvp6s9icfcvx88zjz52n1bli9dyvl5dh7m"))))
-    (build-system python-build-system)
-    (native-inputs
-     `(("unzip" ,unzip)))
-    (home-page "http://pythonhosted.org/pytz")
-    (synopsis "Python timezone library")
-    (description "This library brings the Olson tz database into Python.  It
-allows accurate and cross platform timezone calculations using Python 2.4 or
-higher.  It also solves the issue of ambiguous times at the end of daylight
-saving time.  Almost all of the Olson timezones are supported.")
-    (license license:expat)))
-
-(define-public python2-pytz
-  (package-with-python2 python-pytz))
-
 (define-public python-clyent
   (package
     (name "python-clyent")
@@ -1004,59 +980,6 @@ Python file, so it can be easily copied into your project.")
 (define-public python2-six
   (package-with-python2 python-six))
 
-(define-public python-dateutil
-  (package
-    (name "python-dateutil")
-    (version "2.6.0")
-    (source
-     (origin
-      (method url-fetch)
-      (uri (pypi-uri "python-dateutil" version))
-      (sha256
-       (base32
-        "1lhq0hxjc3cfha101q02ld5ijlpfyjn2w1yh7wvpiy367pgzi8k2"))))
-    (build-system python-build-system)
-    (propagated-inputs
-     `(("python-six" ,python-six)))
-    (home-page "https://dateutil.readthedocs.io/en/stable/")
-    (synopsis "Extensions to the standard datetime module")
-    (description
-     "The dateutil module provides powerful extensions to the standard
-datetime module, available in Python 2.3+.")
-    (license license:bsd-3)))
-
-(define-public python2-dateutil
-  (package-with-python2 python-dateutil))
-
-(define-public python-parsedatetime
-  (package
-    (name "python-parsedatetime")
-    (version "2.4")
-    (source
-     (origin
-      (method url-fetch)
-      (uri (pypi-uri "parsedatetime" version))
-      (sha256
-       (base32
-        "0jxqkjks7z9dn222cqgvskp4wr6d92aglinxq7pd2w4mzdc7r09x"))))
-    (build-system python-build-system)
-    (native-inputs
-     `(("python-nose" ,python-nose)
-       ("python-pyicu" ,python-pyicu)
-       ("python-pytest" ,python-pytest)
-       ("python-pytest-runner" ,python-pytest-runner)))
-    (propagated-inputs
-     `(("python-future" ,python-future)))
-    (home-page "https://github.com/bear/parsedatetime/")
-    (synopsis
-     "Parse human-readable date/time text")
-    (description
-     "Parse human-readable date/time text.")
-    (license license:asl2.0)))
-
-(define-public python2-parsedatetime
-  (package-with-python2 python-parsedatetime))
-
 (define-public python-schedule
   (package
     (name "python-schedule")
@@ -1117,30 +1040,6 @@ doing practical, real world data analysis in Python.")
 (define-public python2-pandas
   (package-with-python2 python-pandas))
 
-(define-public python-tzlocal
-  (package
-    (name "python-tzlocal")
-    (version "1.2.2")
-    (source
-     (origin
-      (method url-fetch)
-      (uri (pypi-uri "tzlocal" version))
-      (sha256
-       (base32
-        "0paj7vlsb0np8b5sp4bv64wxv7qk2piyp7xg29pkhdjwsbls9fnb"))))
-    (build-system python-build-system)
-    (propagated-inputs
-     `(("python-pytz" ,python-pytz)))
-    (home-page "https://github.com/regebro/tzlocal")
-    (synopsis
-     "Local timezone information for Python")
-    (description
-     "Tzlocal returns a tzinfo object with the local timezone information.
-This module attempts to fix a glaring hole in pytz, that there is no way to
-get the local timezone information, unless you know the zoneinfo name, and
-under several distributions that's hard or impossible to figure out.")
-    (license license:cc0)))
-
 (define-public python2-mechanize
   (package
     (name "python2-mechanize")
@@ -4564,30 +4463,6 @@ computing.")
        `(("python2-mock" ,python2-mock)
          ,@(package-native-inputs ipython))))))
 
-(define-public python-isodate
-  (package
-    (name "python-isodate")
-    (version "0.5.4")
-    (source
-      (origin
-        (method url-fetch)
-        (uri (pypi-uri "isodate" version))
-        (sha256
-          (base32
-            "0cafaiwixgpxwh9dsd28qb0dbzsj6xpxjdkyk30ns91ps10mq422"))))
-    (build-system python-build-system)
-    (home-page
-      "http://cheeseshop.python.org/pypi/isodate")
-    (synopsis
-      "Python date parser and formatter")
-    (description
-      "Python-isodate is a python module for parsing and formatting
-ISO 8601 dates, time and duration.")
-    (license license:bsd-3)))
-
-(define-public python2-isodate
-  (package-with-python2 python-isodate))
-
 (define-public python-urwid
   (package
     (name "python-urwid")
@@ -5791,55 +5666,6 @@ and MAC network addresses.")
 (define-public python2-wrapt
   (package-with-python2 python-wrapt))
 
-(define-public python-iso8601
-  (package
-  (name "python-iso8601")
-  (version "0.1.11")
-  (source
-    (origin
-      (method url-fetch)
-      (uri (pypi-uri "iso8601" version))
-      (sha256
-       (base32
-        "0c7gh3lsdjds262h0v1sqc66l7hqgfwbakn96qrhdbl0i3vm5yz8"))))
-  (build-system python-build-system)
-  (native-inputs
-   `(("python-pytest" ,python-pytest)))
-  (home-page "https://bitbucket.org/micktwomey/pyiso8601")
-  (synopsis "Module to parse ISO 8601 dates")
-  (description
-    "This module parses the most common forms of ISO 8601 date strings (e.g.
-@code{2007-01-14T20:34:22+00:00}) into @code{datetime} objects.")
-  (license license:expat)))
-
-(define-public python2-iso8601
-  (package-with-python2 python-iso8601))
-
-(define-public python-monotonic
-  (package
-    (name "python-monotonic")
-    (version "0.3")
-    (source
-      (origin
-        (method url-fetch)
-        (uri (string-append
-               "https://pypi.python.org/packages/source/m/monotonic/monotonic-"
-               version
-               ".tar.gz"))
-        (sha256
-          (base32
-            "0yz0bcbwx8r2c01czzfpbrxddynxyk9k95jj8h6sgcb7xmfvl998"))))
-    (build-system python-build-system)
-    (home-page "https://github.com/atdt/monotonic")
-    (synopsis "Implementation of time.monotonic() for Python 2 & < 3.3")
-    (description
-      "This module provides a monotonic() function which returns the value (in
-fractional seconds) of a clock which never goes backwards.")
-    (license license:asl2.0)))
-
-(define-public python2-monotonic
-  (package-with-python2 python-monotonic))
-
 (define-public python-xlrd
   (package
     (name "python-xlrd")
@@ -6754,31 +6580,6 @@ This allows one to make simple text-mode user interfaces on Unix-like systems")
                  (base32
                   "0d8k7lxk50imdyx85lv8j98i4c93a71iwpapnl1506rpkbm9qvd9")))))))
 
-(define-public python-pyrfc3339
-  (package
-    (name "python-pyrfc3339")
-    (version "1.0")
-    (source
-     (origin
-       (method url-fetch)
-       (uri (pypi-uri "pyRFC3339" version))
-       (sha256
-        (base32
-         "0dgm4l9y8jiax5cp6yxjd2i27cq8h33sh81n1wfbmnmqb32cdywd"))))
-    (build-system python-build-system)
-    (propagated-inputs
-     `(("python-pytz" ,python-pytz)))
-    (native-inputs
-     `(("python-nose" ,python-nose)))
-    (home-page "https://github.com/kurtraschke/pyRFC3339")
-    (synopsis "Python timestamp library")
-    (description "Python library for generating and parsing RFC 3339-compliant
-timestamps.")
-    (license license:expat)))
-
-(define-public python2-pyrfc3339
-  (package-with-python2 python-pyrfc3339))
-
 (define-public python-configobj
   (package
     (name "python-configobj")
@@ -8836,34 +8637,6 @@ objects, patterned after the Mocha library for Ruby.")
 (define-public python2-chai
   (package-with-python2 python-chai))
 
-(define-public python-arrow
-  (package
-    (name "python-arrow")
-    (version "0.10.0")
-    (source (origin
-              (method url-fetch)
-              (uri (pypi-uri "arrow" version))
-              (sha256
-               (base32
-                "08n7q2l69hlainds1byd4lxhwrq7zsw7s640zkqc3bs5jkq0cnc0"))))
-    (build-system python-build-system)
-    (native-inputs
-     `(;; For testing
-       ("python-chai" ,python-chai)
-       ("python-simplejson" ,python-simplejson)))
-    (propagated-inputs
-     `(("python-dateutil" ,python-dateutil)))
-    (home-page "https://github.com/crsmithdev/arrow/")
-    (synopsis "Dates and times for Python")
-    (description
-     "Arrow is a Python library to creating, manipulating, formatting and
-converting dates, times, and timestamps.  It implements and updates the
-datetime type.")
-    (license license:asl2.0)))
-
-(define-public python2-arrow
-  (package-with-python2 python-arrow))
-
 (define-public python-inflection
   (package
     (name "python-inflection")
@@ -9931,31 +9704,6 @@ useful as a validator for JSON data.")
 (define-public python2-validictory
   (package-with-python2 python-validictory))
 
-(define-public python-aniso8601
-  (package
-    (name "python-aniso8601")
-    (version "1.3.0")
-    (source
-      (origin
-        (method url-fetch)
-        (uri (pypi-uri "aniso8601" version))
-        (sha256
-          (base32
-            "1waj54iv3n3lw1fapbz8a93yjgrybgpc86wif5baxdh1arpj9df3"))))
-    (build-system python-build-system)
-    (propagated-inputs
-     `(("python-dateutil" ,python-dateutil)))
-    (home-page
-      "https://bitbucket.org/nielsenb/aniso8601")
-    (synopsis
-      "Python library for parsing ISO 8601 strings")
-    (description
-      "This package contains a library for parsing ISO 8601 datetime strings.")
-    (license license:bsd-3)))
-
-(define-public python2-aniso8601
-  (package-with-python2 python-aniso8601))
-
 (define-public python-pyev
   (package
     (name "python-pyev")
diff --git a/gnu/packages/rdf.scm b/gnu/packages/rdf.scm
index 2fa6475148..5342dbbffb 100644
--- a/gnu/packages/rdf.scm
+++ b/gnu/packages/rdf.scm
@@ -44,6 +44,7 @@
   #:use-module (gnu packages python)
   #:use-module (gnu packages python-web)
   #:use-module (gnu packages qt)
+  #:use-module (gnu packages time)
   #:use-module (gnu packages tls)
   #:use-module (gnu packages xml))
 
diff --git a/gnu/packages/statistics.scm b/gnu/packages/statistics.scm
index c04975f36c..c1f4426f2f 100644
--- a/gnu/packages/statistics.scm
+++ b/gnu/packages/statistics.scm
@@ -57,6 +57,7 @@
   #:use-module (gnu packages readline)
   #:use-module (gnu packages ssh)
   #:use-module (gnu packages texinfo)
+  #:use-module (gnu packages time)
   #:use-module (gnu packages tls)
   #:use-module (gnu packages base)
   #:use-module (gnu packages web)
diff --git a/gnu/packages/time.scm b/gnu/packages/time.scm
index 8d7594c26f..52d47a1a45 100644
--- a/gnu/packages/time.scm
+++ b/gnu/packages/time.scm
@@ -1,8 +1,18 @@
 ;;; GNU Guix --- Functional package management for GNU
 ;;; Copyright © 2012 Nikita Karetnikov <nikita@karetnikov.org>
-;;; Copyright © 2013 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2013, 2017 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2013, 2015 Andreas Enge <andreas@enge.fr>
+;;; Copyright © 2015, 2016, 2017 Efraim Flashner <efraim@flashner.co.il>
+;;; Copyright © 2015, 2017 Leo Famulari <leo@famulari.name>
+;;; Copyright © 2015, 2017 Cyril Roelandt <tipecaml@gmail.com>
+;;; Copyright © 2016 Sou Bunnbu <iyzsong@gmail.com>
+;;; Copyright © 2016 Hartmut Goebel <h.goebel@crazy-compilers.com>
+;;; Copyright © 2016 Danny Milosavljevic <dannym+a@scratchpost.org>
+;;; Copyright © 2016 Marius Bakke <mbakke@fastmail.com>
+;;; Copyright © 2016 Tobias Geerinckx-Rice <me@tobias.gr>
 ;;; Copyright © 2017 Ben Woodcroft <donttrustben@gmail.com>
-;;; Copyright © 2017 Efraim Flashner <efraim@flashner.co.il>
+;;; Copyright © 2017 ng0 <ng0@infotropique.org>
+;;; Copyright © 2017 Julien Lepiller <julien@lepiller.eu>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -26,6 +36,7 @@
   #:use-module (guix build-system gnu)
   #:use-module (guix build-system python)
   #:use-module (gnu packages check)
+  #:use-module (gnu packages compression)
   #:use-module (gnu packages python))
 
 (define-public time
@@ -73,6 +84,31 @@ to a file.")
 (define-public python2-tzdata
   (package-with-python2 python-pytzdata))
 
+(define-public python-pytz
+  (package
+    (name "python-pytz")
+    (version "2017.2")
+    (source
+     (origin
+      (method url-fetch)
+      (uri (pypi-uri "pytz" version ".zip"))
+      (sha256
+       (base32
+        "12cmd3j46d2gcw08bspvp6s9icfcvx88zjz52n1bli9dyvl5dh7m"))))
+    (build-system python-build-system)
+    (native-inputs
+     `(("unzip" ,unzip)))
+    (home-page "http://pythonhosted.org/pytz")
+    (synopsis "Python timezone library")
+    (description "This library brings the Olson tz database into Python.  It
+allows accurate and cross platform timezone calculations using Python 2.4 or
+higher.  It also solves the issue of ambiguous times at the end of daylight
+saving time.  Almost all of the Olson timezones are supported.")
+    (license expat)))
+
+(define-public python2-pytz
+  (package-with-python2 python-pytz))
+
 (define-public python-pendulum
   (package
     (name "python-pendulum")
@@ -102,3 +138,225 @@ Pendulum instances.")
 
 (define-public python2-pendulum
   (package-with-python2 python-pendulum))
+
+(define-public python-dateutil
+  (package
+    (name "python-dateutil")
+    (version "2.6.0")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (pypi-uri "python-dateutil" version))
+       (sha256
+        (base32
+         "1lhq0hxjc3cfha101q02ld5ijlpfyjn2w1yh7wvpiy367pgzi8k2"))))
+    (build-system python-build-system)
+    (propagated-inputs
+     `(("python-six" ,python-six)))
+    (home-page "https://dateutil.readthedocs.io/en/stable/")
+    (synopsis "Extensions to the standard datetime module")
+    (description
+     "The dateutil module provides powerful extensions to the standard
+datetime module, available in Python 2.3+.")
+    (license bsd-3)))
+
+(define-public python2-dateutil
+  (package-with-python2 python-dateutil))
+
+(define-public python-parsedatetime
+  (package
+    (name "python-parsedatetime")
+    (version "2.4")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (pypi-uri "parsedatetime" version))
+       (sha256
+        (base32
+         "0jxqkjks7z9dn222cqgvskp4wr6d92aglinxq7pd2w4mzdc7r09x"))))
+    (build-system python-build-system)
+    (native-inputs
+     `(("python-nose" ,python-nose)
+       ("python-pyicu" ,python-pyicu)
+       ("python-pytest" ,python-pytest)
+       ("python-pytest-runner" ,python-pytest-runner)))
+    (propagated-inputs
+     `(("python-future" ,python-future)))
+    (home-page "https://github.com/bear/parsedatetime/")
+    (synopsis "Parse human-readable date/time text")
+    (description
+     "Parse human-readable date/time text.")
+    (license asl2.0)))
+
+(define-public python2-parsedatetime
+  (package-with-python2 python-parsedatetime))
+
+(define-public python-tzlocal
+  (package
+    (name "python-tzlocal")
+    (version "1.2.2")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (pypi-uri "tzlocal" version))
+       (sha256
+        (base32
+         "0paj7vlsb0np8b5sp4bv64wxv7qk2piyp7xg29pkhdjwsbls9fnb"))))
+    (build-system python-build-system)
+    (propagated-inputs
+     `(("python-pytz" ,python-pytz)))
+    (home-page "https://github.com/regebro/tzlocal")
+    (synopsis "Local timezone information for Python")
+    (description
+     "Tzlocal returns a tzinfo object with the local timezone information.
+This module attempts to fix a glaring hole in pytz, that there is no way to
+get the local timezone information, unless you know the zoneinfo name, and
+under several distributions that's hard or impossible to figure out.")
+    (license cc0)))
+
+(define-public python-isodate
+  (package
+    (name "python-isodate")
+    (version "0.5.4")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (pypi-uri "isodate" version))
+       (sha256
+        (base32
+         "0cafaiwixgpxwh9dsd28qb0dbzsj6xpxjdkyk30ns91ps10mq422"))))
+    (build-system python-build-system)
+    (home-page "http://cheeseshop.python.org/pypi/isodate")
+    (synopsis "Python date parser and formatter")
+    (description
+     "Python-isodate is a python module for parsing and formatting
+ISO 8601 dates, time and duration.")
+    (license bsd-3)))
+
+(define-public python2-isodate
+  (package-with-python2 python-isodate))
+
+(define-public python-iso8601
+  (package
+    (name "python-iso8601")
+    (version "0.1.11")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (pypi-uri "iso8601" version))
+       (sha256
+        (base32
+         "0c7gh3lsdjds262h0v1sqc66l7hqgfwbakn96qrhdbl0i3vm5yz8"))))
+    (build-system python-build-system)
+    (native-inputs
+     `(("python-pytest" ,python-pytest)))
+    (home-page "https://bitbucket.org/micktwomey/pyiso8601")
+    (synopsis "Module to parse ISO 8601 dates")
+    (description
+     "This module parses the most common forms of ISO 8601 date strings (e.g.
+@code{2007-01-14T20:34:22+00:00}) into @code{datetime} objects.")
+    (license expat)))
+
+(define-public python2-iso8601
+  (package-with-python2 python-iso8601))
+
+(define-public python-monotonic
+  (package
+    (name "python-monotonic")
+    (version "0.3")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (string-append
+             "https://pypi.python.org/packages/source/m/monotonic/monotonic-"
+             version
+             ".tar.gz"))
+       (sha256
+        (base32
+         "0yz0bcbwx8r2c01czzfpbrxddynxyk9k95jj8h6sgcb7xmfvl998"))))
+    (build-system python-build-system)
+    (home-page "https://github.com/atdt/monotonic")
+    (synopsis "Implementation of time.monotonic() for Python 2 & < 3.3")
+    (description
+     "This module provides a @code{monotonic()} function which returns the
+value (in fractional seconds) of a clock which never goes backwards.")
+    (license asl2.0)))
+
+(define-public python2-monotonic
+  (package-with-python2 python-monotonic))
+
+(define-public python-pyrfc3339
+  (package
+    (name "python-pyrfc3339")
+    (version "1.0")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (pypi-uri "pyRFC3339" version))
+       (sha256
+        (base32
+         "0dgm4l9y8jiax5cp6yxjd2i27cq8h33sh81n1wfbmnmqb32cdywd"))))
+    (build-system python-build-system)
+    (propagated-inputs
+     `(("python-pytz" ,python-pytz)))
+    (native-inputs
+     `(("python-nose" ,python-nose)))
+    (home-page "https://github.com/kurtraschke/pyRFC3339")
+    (synopsis "Python timestamp library")
+    (description "Python library for generating and parsing RFC 3339-compliant
+timestamps.")
+    (license expat)))
+
+(define-public python2-pyrfc3339
+  (package-with-python2 python-pyrfc3339))
+
+(define-public python-arrow
+  (package
+    (name "python-arrow")
+    (version "0.10.0")
+    (source (origin
+              (method url-fetch)
+              (uri (pypi-uri "arrow" version))
+              (sha256
+               (base32
+                "08n7q2l69hlainds1byd4lxhwrq7zsw7s640zkqc3bs5jkq0cnc0"))))
+    (build-system python-build-system)
+    (native-inputs
+     `(;; For testing
+       ("python-chai" ,python-chai)
+       ("python-simplejson" ,python-simplejson)))
+    (propagated-inputs
+     `(("python-dateutil" ,python-dateutil)))
+    (home-page "https://github.com/crsmithdev/arrow/")
+    (synopsis "Dates and times for Python")
+    (description
+     "Arrow is a Python library to creating, manipulating, formatting and
+converting dates, times, and timestamps.  It implements and updates the
+datetime type.")
+    (license asl2.0)))
+
+(define-public python2-arrow
+  (package-with-python2 python-arrow))
+
+(define-public python-aniso8601
+  (package
+    (name "python-aniso8601")
+    (version "1.3.0")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (pypi-uri "aniso8601" version))
+       (sha256
+        (base32
+         "1waj54iv3n3lw1fapbz8a93yjgrybgpc86wif5baxdh1arpj9df3"))))
+    (build-system python-build-system)
+    (propagated-inputs
+     `(("python-dateutil" ,python-dateutil)))
+    (home-page "https://bitbucket.org/nielsenb/aniso8601")
+    (synopsis "Python library for parsing ISO 8601 strings")
+    (description
+     "This package contains a library for parsing ISO 8601 datetime strings.")
+    (license bsd-3)))
+
+(define-public python2-aniso8601
+  (package-with-python2 python-aniso8601))
diff --git a/gnu/packages/tls.scm b/gnu/packages/tls.scm
index 433793439d..595524506a 100644
--- a/gnu/packages/tls.scm
+++ b/gnu/packages/tls.scm
@@ -56,6 +56,7 @@
   #:use-module (gnu packages python-crypto)
   #:use-module (gnu packages python-web)
   #:use-module (gnu packages texinfo)
+  #:use-module (gnu packages time)
   #:use-module (gnu packages base)
   #:use-module (srfi srfi-1))
 
diff --git a/gnu/packages/tryton.scm b/gnu/packages/tryton.scm
index 2e669510e6..aa7af669c8 100644
--- a/gnu/packages/tryton.scm
+++ b/gnu/packages/tryton.scm
@@ -24,6 +24,7 @@
   #:use-module (gnu packages gtk)
   #:use-module (gnu packages python)
   #:use-module (gnu packages python-web)
+  #:use-module (gnu packages time)
   #:use-module (guix packages)
   #:use-module (guix download)
   #:use-module (guix build-system python))
diff --git a/gnu/packages/version-control.scm b/gnu/packages/version-control.scm
index 20f20a4040..9de660f090 100644
--- a/gnu/packages/version-control.scm
+++ b/gnu/packages/version-control.scm
@@ -82,6 +82,7 @@
   #:use-module (gnu packages compression)
   #:use-module (gnu packages swig)
   #:use-module (gnu packages tcl)
+  #:use-module (gnu packages time)
   #:use-module (gnu packages tls)
   #:use-module (gnu packages)
   #:use-module (ice-9 match)