diff --git a/modules/badges.py b/modules/badges.py
index 4eb3d626..631e7ccd 100644
--- a/modules/badges.py
+++ b/modules/badges.py
@@ -5,12 +5,11 @@ from src import ModuleManager, utils
 
 RE_HUMAN_FORMAT = re.compile(r"(\d\d\d\d)-(\d?\d)-(\d?\d)")
 HUMAN_FORMAT_HELP = "year-month-day (e.g. 2018-12-29)"
-DATETIME_FORMAT = "%Y-%m-%dT%H:%M:%SZ"
 
 class Module(ModuleManager.BaseModule):
     def _parse_date(self, dt: str):
         if dt.lower() == "today":
-            return utils.datetime_utcnow()
+            return utils.datetime.datetime_utcnow()
         else:
             match = RE_HUMAN_FORMAT.match(dt)
             if not match:
@@ -23,7 +22,7 @@ class Module(ModuleManager.BaseModule):
             ).replace(tzinfo=datetime.timezone.utc)
 
     def _date_str(self, dt: datetime.datetime):
-        return utils.date_human(dt)
+        return utils.datetime.date_human(dt)
 
     def _round_up_day(self, dt: datetime.datetime):
         return dt.date()+datetime.timedelta(days=1)
@@ -53,12 +52,12 @@ class Module(ModuleManager.BaseModule):
         badge_lower = badge.lower()
         badges = self._get_badges(event["user"])
 
-        now = self._round_up_day(utils.datetime_utcnow())
+        now = self._round_up_day(utils.datetime.datetime_utcnow())
 
         found_badge = self._find_badge(badges, badge)
 
         if found_badge:
-            dt = utils.iso8601_parse(badges[found_badge])
+            dt = utils.datetime.iso8601_parse(badges[found_badge])
             days_since = self._days_since(now, dt)
             event["stdout"].write("(%s) %s on day %s (%s)" % (
                 event["user"].nickname, found_badge, days_since,
@@ -75,10 +74,11 @@ class Module(ModuleManager.BaseModule):
         if event["args"]:
             user = event["server"].get_user(event["args_split"][0])
 
-        now = self._round_up_day(utils.datetime_utcnow())
+        now = self._round_up_day(utils.datetime.datetime_utcnow())
         badges = []
         for badge, date in self._get_badges(user).items():
-            days_since = self._days_since(now, utils.iso8601_parse(date))
+            days_since = self._days_since(now,
+                utils.datetime.iso8601_parse(date))
             badges.append("%s on day %s" % (
                 badge, days_since))
 
@@ -99,7 +99,7 @@ class Module(ModuleManager.BaseModule):
             if badge_name.lower() == badge_lower:
                 raise utils.EventError("You already have a '%s' badge" % badge)
 
-        badges[badge] = utils.iso8601_format_now()
+        badges[badge] = utils.datetime.iso8601_format_now()
         self._set_badges(event["user"], badges)
         event["stdout"].write("Added '%s' badge" % badge)
 
@@ -135,7 +135,7 @@ class Module(ModuleManager.BaseModule):
         found_badge = self._find_badge(badges, badge)
 
         if found_badge:
-            badges[found_badge] = utils.iso8601_format_now()
+            badges[found_badge] = utils.datetime.iso8601_format_now()
             self._set_badges(event["user"], badges)
             event["stdout"].write("Reset badge '%s'" % found_badge)
         else:
@@ -158,7 +158,7 @@ class Module(ModuleManager.BaseModule):
 
         dt = self._parse_date(event["args_split"][-1])
 
-        badges[found_badge] = utils.iso8601_format(dt)
+        badges[found_badge] = utils.datetime.iso8601_format(dt)
         self._set_badges(event["user"], badges)
         event["stdout"].write("Updated '%s' badge to %s" % (
             found_badge, self._date_str(dt)))
@@ -176,7 +176,7 @@ class Module(ModuleManager.BaseModule):
         found_badge = self._find_badge(badges, badge)
         dt = self._parse_date(event["args_split"][-1])
 
-        badges[found_badge or badge] = utils.iso8601_format(dt)
+        badges[found_badge or badge] = utils.datetime.iso8601_format(dt)
         self._set_badges(event["user"], badges)
 
         add_or_update = "Added" if not found_badge else "Updated"
diff --git a/modules/channel_op.py b/modules/channel_op.py
index a4ef250f..9d6d08d9 100644
--- a/modules/channel_op.py
+++ b/modules/channel_op.py
@@ -31,7 +31,7 @@ class Module(ModuleManager.BaseModule):
         if args and args[0][0] == "+":
             if len(args[1:]) < min_args:
                 raise utils.EventError("Not enough arguments")
-            time = utils.from_pretty_time(args[0][1:])
+            time = utils.datetime.from_pretty_time(args[0][1:])
             if time == None:
                 raise utils.EventError("Invalid timeframe")
             return time, args[1:]
diff --git a/modules/coins.py b/modules/coins.py
index dc2a240a..12a0af44 100644
--- a/modules/coins.py
+++ b/modules/coins.py
@@ -190,7 +190,7 @@ class Module(ModuleManager.BaseModule):
                 time_left = self.bot.cache.until_expiration(cache)
                 event["stderr"].write("%s: Please wait %s before redeeming" % (
                     event["user"].nickname,
-                    utils.to_pretty_time(math.ceil(time_left))))
+                    utils.datetime.to_pretty_time(math.ceil(time_left))))
         else:
             event["stderr"].write(
                 "%s: You can only redeem coins when you have none" %
@@ -525,7 +525,7 @@ class Module(ModuleManager.BaseModule):
         """
         until = self._until_next_6_hour()
         event["stdout"].write("Next lottery is in: %s" %
-            utils.to_pretty_time(until))
+            utils.datetime.to_pretty_time(until))
 
     @utils.hook("received.command.lotterywinner")
     def lottery_winner(self, event):
diff --git a/modules/fediverse/ap_server.py b/modules/fediverse/ap_server.py
index df592d4c..d9c644b5 100644
--- a/modules/fediverse/ap_server.py
+++ b/modules/fediverse/ap_server.py
@@ -52,7 +52,7 @@ class Server(object):
             activities.append([activity_id, content, timestamp])
         return activities
     def _make_activity(self, content):
-        timestamp = utils.iso8601_format_now()
+        timestamp = utils.datetime.iso8601_format_now()
         activity_id = self._random_id()
         self.bot.set_setting("ap-activity-%s" % activity_id,
             [content, timestamp])
diff --git a/modules/format_activity.py b/modules/format_activity.py
index eeeb6029..31c4a37b 100644
--- a/modules/format_activity.py
+++ b/modules/format_activity.py
@@ -227,7 +227,8 @@ class Module(ModuleManager.BaseModule):
         self._on_topic(event, event["setter"].nickname, "set",
             event["channel"].topic)
 
-        dt = utils.iso8601_format(utils.datetime_timestamp(event["set_at"]))
+        dt = utils.datetime.iso8601_format(
+            utils.datetime.datetime_timestamp(event["set_at"]))
 
         minimal = "topic set at %s" % dt
         normal = "- %s" % minimal
diff --git a/modules/git_webhooks/github.py b/modules/git_webhooks/github.py
index a95be555..cdf9016d 100644
--- a/modules/git_webhooks/github.py
+++ b/modules/git_webhooks/github.py
@@ -178,7 +178,7 @@ class GitHub(object):
             return url
 
     def _iso8601(self, s):
-        return datetime.datetime.strptime(s, utils.ISO8601_PARSE)
+        return utils.datetime.iso8601_parse(s)
 
     def ping(self, data):
         return ["Received new webhook"]
@@ -415,7 +415,7 @@ class GitHub(object):
             completed_at = self._iso8601(data["check_run"]["completed_at"])
             if completed_at > started_at:
                 seconds = (completed_at-started_at).total_seconds()
-                duration = " in %s" % utils.to_pretty_time(seconds)
+                duration = " in %s" % utils.datetime.to_pretty_time(seconds)
 
         status = data["check_run"]["status"]
         status_str = ""
diff --git a/modules/in.py b/modules/in.py
index 7dcffe34..86cf4adb 100644
--- a/modules/in.py
+++ b/modules/in.py
@@ -2,7 +2,7 @@
 import time
 from src import ModuleManager, utils
 
-SECONDS_MAX = utils.SECONDS_WEEKS*8
+SECONDS_MAX = utils.datetime.SECONDS_WEEKS*8
 SECONDS_MAX_DESCRIPTION = "8 weeks"
 
 class Module(ModuleManager.BaseModule):
diff --git a/modules/seen.py b/modules/seen.py
index c3aed8ab..e7de15b9 100644
--- a/modules/seen.py
+++ b/modules/seen.py
@@ -38,7 +38,7 @@ class Module(ModuleManager.BaseModule):
                     seen_info = " (%s%s)" % (seen_info["action"],
                         utils.consts.RESET)
 
-            since = utils.to_pretty_time(time.time()-seen_seconds,
+            since = utils.datetime.to_pretty_time(time.time()-seen_seconds,
                 max_units=2)
             event["stdout"].write("%s was last seen %s ago%s" % (
                 event["args_split"][0], since, seen_info or ""))
diff --git a/modules/silence.py b/modules/silence.py
index 4bc7aaf6..42990921 100644
--- a/modules/silence.py
+++ b/modules/silence.py
@@ -30,7 +30,8 @@ class Module(ModuleManager.BaseModule):
     def silence(self, event):
         duration = SILENCE_TIME
         if event["args"] and event["args_split"][0].startswith("+"):
-            duration = utils.from_pretty_time(event["args_split"][0][1:])
+            duration = utils.datetime.from_pretty_time(
+                event["args_split"][0][1:])
             if duration == None:
                 raise utils.EventError("Invalid duration provided")
 
diff --git a/modules/stats.py b/modules/stats.py
index ee92e7c8..a5ca5127 100644
--- a/modules/stats.py
+++ b/modules/stats.py
@@ -7,7 +7,8 @@ HIDDEN_MODES = set(["s", "p"])
 
 class Module(ModuleManager.BaseModule):
     def _uptime(self):
-        return utils.to_pretty_time(int(time.time()-self.bot.start_time))
+        return utils.datetime.to_pretty_time(
+            int(time.time()-self.bot.start_time))
 
     @utils.hook("received.command.uptime")
     def uptime(self, event):
diff --git a/modules/title.py b/modules/title.py
index 2a74470a..96a9ee0b 100644
--- a/modules/title.py
+++ b/modules/title.py
@@ -94,14 +94,17 @@ class Module(ModuleManager.BaseModule):
 
                     if first_details:
                         first_nickname, first_timestamp, _ = first_details
-                        timestamp_parsed = utils.iso8601_parse(first_timestamp)
-                        timestamp_human = utils.datetime_human(timestamp_parsed)
+                        timestamp_parsed = utils.datetime.iso8601_parse(
+                            first_timestamp)
+                        timestamp_human = utils.datetime.datetime_human(
+                            timestamp_parsed)
+
                         message = "%s (first posted by %s at %s)" % (title,
                             first_nickname, timestamp_human)
                     else:
                         event["target"].set_setting(setting,
-                            [event["user"].nickname, utils.iso8601_format_now(),
-                            url])
+                            [event["user"].nickname,
+                            utils.datetime.iso8601_format_now(), url])
                 event["stdout"].write(message)
             if code == -2:
                 self.log.debug("Not showing title for %s, too similar", [url])
diff --git a/modules/to.py b/modules/to.py
index 91c9fa72..eb0ad03a 100644
--- a/modules/to.py
+++ b/modules/to.py
@@ -8,8 +8,8 @@ class Module(ModuleManager.BaseModule):
         messages = event["channel"].get_user_setting(event["user"].get_id(),
             "to", [])
         for nickname, message, timestamp in messages:
-            timestamp_parsed = utils.iso8601_parse(timestamp)
-            timestamp_human = utils.datetime_human(timestamp_parsed)
+            timestamp_parsed = utils.datetime.iso8601_parse(timestamp)
+            timestamp_human = utils.datetime.datetime_human(timestamp_parsed)
             event["channel"].send_message("%s: <%s> %s (at %s UTC)" % (
                 event["user"].nickname, nickname, message, timestamp_human))
         if messages:
@@ -35,7 +35,7 @@ class Module(ModuleManager.BaseModule):
 
         messages.append([event["user"].nickname,
             " ".join(event["args_split"][1:]),
-            utils.iso8601_format_now()])
+            utils.datetime.iso8601_format_now()])
         event["target"].set_user_setting(target_user.get_id(),
             "to", messages)
         event["stdout"].write("Message saved")
diff --git a/modules/tweets/format.py b/modules/tweets/format.py
index 4d64dffd..3248dc36 100644
--- a/modules/tweets/format.py
+++ b/modules/tweets/format.py
@@ -3,7 +3,7 @@ from src import utils
 
 def _timestamp(dt):
     seconds_since = time.time()-dt.timestamp()
-    since, unit = utils.time_unit(seconds_since)
+    since, unit = utils.datetime.time_unit(seconds_since)
     return "%s %s ago" % (since, unit)
 
 def _normalise(tweet):
diff --git a/modules/user_time.py b/modules/user_time.py
index c384669a..19ed4b22 100644
--- a/modules/user_time.py
+++ b/modules/user_time.py
@@ -58,7 +58,7 @@ class Module(ModuleManager.BaseModule):
                 if utc_offset > 0:
                     tz += "+"
                 tz += "%g" % utc_offset
-            human = utils.datetime_human(dt)
+            human = utils.datetime.datetime_human(dt)
 
             out = None
             if type == LocationType.USER:
diff --git a/modules/words.py b/modules/words.py
index 520f05fc..c76fb3dc 100644
--- a/modules/words.py
+++ b/modules/words.py
@@ -79,8 +79,8 @@ class Module(ModuleManager.BaseModule):
         since = ""
         first_words = target.get_setting("first-words", None)
         if not first_words == None:
-            since = " since %s" % utils.date_human(
-                utils.datetime_timestamp(first_words))
+            since = " since %s" % utils.datetime.date_human(
+                utils.datetime.datetime_timestamp(first_words))
 
         event["stdout"].write("%s has used %d words (%d in %s)%s" % (
             target.nickname, total, this_channel, event["target"].name, since))
diff --git a/modules/youtube.py b/modules/youtube.py
index e782ff21..6d25c3e8 100644
--- a/modules/youtube.py
+++ b/modules/youtube.py
@@ -45,9 +45,9 @@ class Module(ModuleManager.BaseModule):
             content = self.get_video_page(video_id, "contentDetails").data[
                 "items"][0]["contentDetails"]
 
-            video_uploaded_at = utils.iso8601_parse(snippet["publishedAt"],
-                microseconds=True)
-            video_uploaded_at = utils.date_human(video_uploaded_at)
+            video_uploaded_at = utils.datetime.iso8601_parse(
+                snippet["publishedAt"], microseconds=True)
+            video_uploaded_at = utils.datetime.date_human(video_uploaded_at)
             video_uploader = snippet["channelTitle"]
             video_title = utils.irc.bold(snippet["title"])
             video_views = self._number(statistics["viewCount"])
diff --git a/src/LockFile.py b/src/LockFile.py
index 4bb07726..309e8e87 100644
--- a/src/LockFile.py
+++ b/src/LockFile.py
@@ -9,12 +9,12 @@ class LockFile(PollHook.PollHook):
         self._next_lock = None
 
     def available(self):
-        now = utils.datetime_utcnow()
+        now = utils.datetime.datetime_utcnow()
         if os.path.exists(self._filename):
             with open(self._filename, "r") as lock_file:
                 timestamp_str = lock_file.read().strip().split(" ", 1)[0]
 
-            timestamp = utils.iso8601_parse(timestamp_str)
+            timestamp = utils.datetime.iso8601_parse(timestamp_str)
 
             if (now-timestamp).total_seconds() < EXPIRATION:
                 return False
@@ -23,13 +23,14 @@ class LockFile(PollHook.PollHook):
 
     def lock(self):
         with open(self._filename, "w") as lock_file:
-            last_lock = utils.datetime_utcnow()
-            lock_file.write("%s" % utils.iso8601_format(last_lock))
+            last_lock = utils.datetime.datetime_utcnow()
+            lock_file.write("%s" % utils.datetime.iso8601_format(last_lock))
             self._next_lock = last_lock+datetime.timedelta(
                 seconds=EXPIRATION/2)
 
     def next(self):
-        return max(0, (self._next_lock-utils.datetime_utcnow()).total_seconds())
+        return max(0,
+            (self._next_lock-utils.datetime.datetime_utcnow()).total_seconds())
     def call(self):
         self.lock()
 
diff --git a/src/Logging.py b/src/Logging.py
index edb1687d..61b90402 100644
--- a/src/Logging.py
+++ b/src/Logging.py
@@ -13,7 +13,7 @@ LEVELS = {
 class BitBotFormatter(logging.Formatter):
     def formatTime(self, record, datefmt=None):
         datetime_obj = datetime.datetime.fromtimestamp(record.created)
-        return utils.iso8601_format(datetime_obj, milliseconds=True)
+        return utils.datetime.iso8601_format(datetime_obj, milliseconds=True)
 
 class HookedHandler(logging.StreamHandler):
     def __init__(self, func: typing.Callable[[int, str], None]):
diff --git a/src/utils/__init__.py b/src/utils/__init__.py
index b7b581e2..294b9083 100644
--- a/src/utils/__init__.py
+++ b/src/utils/__init__.py
@@ -1,6 +1,6 @@
-import contextlib, datetime, decimal, enum, io, ipaddress, multiprocessing
+import contextlib, decimal, enum, io, ipaddress, multiprocessing
 import queue, re, signal, threading, typing
-from . import cli, consts, decorators, irc, http, parse, security
+from . import cli, consts, datetime, decorators, irc, http, parse, security
 
 from .decorators import export, hook, kwarg
 from .settings import (BoolSetting, FunctionSetting, IntRangeSetting,
@@ -10,129 +10,6 @@ class Direction(enum.Enum):
     Send = 0
     Recv = 1
 
-ISO8601_PARSE = "%Y-%m-%dT%H:%M:%S%z"
-ISO8601_PARSE_MICROSECONDS = "%Y-%m-%dT%H:%M:%S.%f%z"
-
-ISO8601_FORMAT_DT = "%Y-%m-%dT%H:%M:%S"
-ISO8601_FORMAT_TZ = "%z"
-
-
-DATETIME_HUMAN = "%Y/%m/%d %H:%M:%S"
-DATE_HUMAN = "%Y-%m-%d"
-
-def datetime_utcnow() -> datetime.datetime:
-    return datetime.datetime.utcnow().replace(tzinfo=datetime.timezone.utc)
-def datetime_timestamp(seconds: float) -> datetime.datetime:
-    return datetime.datetime.fromtimestamp(seconds).replace(
-        tzinfo=datetime.timezone.utc)
-
-def iso8601_format(dt: datetime.datetime, milliseconds: bool=False) -> str:
-    dt_format = dt.strftime(ISO8601_FORMAT_DT)
-    tz_format = dt.strftime(ISO8601_FORMAT_TZ)
-
-    ms_format = ""
-    if milliseconds:
-        ms_format = ".%s" % str(int(dt.microsecond/1000)).zfill(3)
-
-    return "%s%s%s" % (dt_format, ms_format, tz_format)
-def iso8601_format_now(milliseconds: bool=False) -> str:
-    return iso8601_format(datetime_utcnow(), milliseconds=milliseconds)
-def iso8601_parse(s: str, microseconds: bool=False) -> datetime.datetime:
-    fmt = ISO8601_PARSE_MICROSECONDS if microseconds else ISO8601_PARSE
-    return datetime.datetime.strptime(s, fmt)
-
-def datetime_human(dt: datetime.datetime):
-    return datetime.datetime.strftime(dt, DATETIME_HUMAN)
-def date_human(dt: datetime.datetime):
-    return datetime.datetime.strftime(dt, DATE_HUMAN)
-
-TIME_SECOND = 1
-TIME_MINUTE = TIME_SECOND*60
-TIME_HOUR = TIME_MINUTE*60
-TIME_DAY = TIME_HOUR*24
-TIME_WEEK = TIME_DAY*7
-
-def time_unit(seconds: int) -> typing.Tuple[int, str]:
-    since = None
-    unit = None
-    if seconds >= TIME_WEEK:
-        since = seconds/TIME_WEEK
-        unit = "week"
-    elif seconds >= TIME_DAY:
-        since = seconds/TIME_DAY
-        unit = "day"
-    elif seconds >= TIME_HOUR:
-        since = seconds/TIME_HOUR
-        unit = "hour"
-    elif seconds >= TIME_MINUTE:
-        since = seconds/TIME_MINUTE
-        unit = "minute"
-    else:
-        since = seconds
-        unit = "second"
-    since = int(since)
-    if since > 1:
-        unit = "%ss" % unit # pluralise the unit
-    return (since, unit)
-
-REGEX_PRETTYTIME = re.compile(
-    r"(?:(\d+)w)?(?:(\d+)d)?(?:(\d+)h)?(?:(\d+)m)?(?:(\d+)s)?", re.I)
-
-SECONDS_MINUTES = 60
-SECONDS_HOURS = SECONDS_MINUTES*60
-SECONDS_DAYS = SECONDS_HOURS*24
-SECONDS_WEEKS = SECONDS_DAYS*7
-
-def from_pretty_time(pretty_time: str) -> typing.Optional[int]:
-    seconds = 0
-
-    match = re.match(REGEX_PRETTYTIME, pretty_time)
-    if match:
-        seconds += int(match.group(1) or 0)*SECONDS_WEEKS
-        seconds += int(match.group(2) or 0)*SECONDS_DAYS
-        seconds += int(match.group(3) or 0)*SECONDS_HOURS
-        seconds += int(match.group(4) or 0)*SECONDS_MINUTES
-        seconds += int(match.group(5) or 0)
-
-    if seconds > 0:
-        return seconds
-    return None
-
-UNIT_MINIMUM = 6
-UNIT_SECOND = 5
-UNIT_MINUTE = 4
-UNIT_HOUR = 3
-UNIT_DAY = 2
-UNIT_WEEK = 1
-def to_pretty_time(total_seconds: int, minimum_unit: int=UNIT_SECOND,
-        max_units: int=UNIT_MINIMUM) -> str:
-    if total_seconds == 0:
-        return "0s"
-
-    minutes, seconds = divmod(total_seconds, 60)
-    hours, minutes = divmod(minutes, 60)
-    days, hours = divmod(hours, 24)
-    weeks, days = divmod(days, 7)
-    out = []
-
-    units = 0
-    if weeks and minimum_unit >= UNIT_WEEK and units < max_units:
-        out.append("%dw" % weeks)
-        units += 1
-    if days and minimum_unit >= UNIT_DAY and units < max_units:
-        out.append("%dd" % days)
-        units += 1
-    if hours and minimum_unit >= UNIT_HOUR and units < max_units:
-        out.append("%dh" % hours)
-        units += 1
-    if minutes and minimum_unit >= UNIT_MINUTE and units < max_units:
-        out.append("%dm" % minutes)
-        units += 1
-    if seconds and minimum_unit >= UNIT_SECOND and units < max_units:
-        out.append("%ds" % seconds)
-        units += 1
-    return " ".join(out)
-
 def prevent_highlight(nickname: str) -> str:
     return nickname[0]+"\u200c"+nickname[1:]
 
diff --git a/src/utils/datetime.py b/src/utils/datetime.py
new file mode 100644
index 00000000..0fac2bb3
--- /dev/null
+++ b/src/utils/datetime.py
@@ -0,0 +1,125 @@
+import re, typing
+import datetime as _datetime
+
+ISO8601_PARSE = "%Y-%m-%dT%H:%M:%S%z"
+ISO8601_PARSE_MICROSECONDS = "%Y-%m-%dT%H:%M:%S.%f%z"
+
+ISO8601_FORMAT_DT = "%Y-%m-%dT%H:%M:%S"
+ISO8601_FORMAT_TZ = "%z"
+
+DATETIME_HUMAN = "%Y/%m/%d %H:%M:%S"
+DATE_HUMAN = "%Y-%m-%d"
+
+def datetime_utcnow() -> _datetime.datetime:
+    return _datetime.datetime.utcnow().replace(tzinfo=_datetime.timezone.utc)
+def datetime_timestamp(seconds: float) -> _datetime.datetime:
+    return _datetime.datetime.fromtimestamp(seconds).replace(
+        tzinfo=_datetime.timezone.utc)
+
+def iso8601_format(dt: _datetime.datetime, milliseconds: bool=False) -> str:
+    dt_format = dt.strftime(ISO8601_FORMAT_DT)
+    tz_format = dt.strftime(ISO8601_FORMAT_TZ)
+
+    ms_format = ""
+    if milliseconds:
+        ms_format = ".%s" % str(int(dt.microsecond/1000)).zfill(3)
+
+    return "%s%s%s" % (dt_format, ms_format, tz_format)
+def iso8601_format_now(milliseconds: bool=False) -> str:
+    return iso8601_format(datetime_utcnow(), milliseconds=milliseconds)
+def iso8601_parse(s: str, microseconds: bool=False) -> _datetime.datetime:
+    fmt = ISO8601_PARSE_MICROSECONDS if microseconds else ISO8601_PARSE
+    return _datetime.datetime.strptime(s, fmt)
+
+def datetime_human(dt: _datetime.datetime):
+    return _datetime.datetime.strftime(dt, DATETIME_HUMAN)
+def date_human(dt: _datetime.datetime):
+    return _datetime.datetime.strftime(dt, DATE_HUMAN)
+
+TIME_SECOND = 1
+TIME_MINUTE = TIME_SECOND*60
+TIME_HOUR = TIME_MINUTE*60
+TIME_DAY = TIME_HOUR*24
+TIME_WEEK = TIME_DAY*7
+
+def time_unit(seconds: int) -> typing.Tuple[int, str]:
+    since = None
+    unit = None
+    if seconds >= TIME_WEEK:
+        since = seconds/TIME_WEEK
+        unit = "week"
+    elif seconds >= TIME_DAY:
+        since = seconds/TIME_DAY
+        unit = "day"
+    elif seconds >= TIME_HOUR:
+        since = seconds/TIME_HOUR
+        unit = "hour"
+    elif seconds >= TIME_MINUTE:
+        since = seconds/TIME_MINUTE
+        unit = "minute"
+    else:
+        since = seconds
+        unit = "second"
+    since = int(since)
+    if since > 1:
+        unit = "%ss" % unit # pluralise the unit
+    return (since, unit)
+
+REGEX_PRETTYTIME = re.compile(
+    r"(?:(\d+)w)?(?:(\d+)d)?(?:(\d+)h)?(?:(\d+)m)?(?:(\d+)s)?", re.I)
+
+SECONDS_MINUTES = 60
+SECONDS_HOURS = SECONDS_MINUTES*60
+SECONDS_DAYS = SECONDS_HOURS*24
+SECONDS_WEEKS = SECONDS_DAYS*7
+
+def from_pretty_time(pretty_time: str) -> typing.Optional[int]:
+    seconds = 0
+
+    match = re.match(REGEX_PRETTYTIME, pretty_time)
+    if match:
+        seconds += int(match.group(1) or 0)*SECONDS_WEEKS
+        seconds += int(match.group(2) or 0)*SECONDS_DAYS
+        seconds += int(match.group(3) or 0)*SECONDS_HOURS
+        seconds += int(match.group(4) or 0)*SECONDS_MINUTES
+        seconds += int(match.group(5) or 0)
+
+    if seconds > 0:
+        return seconds
+    return None
+
+UNIT_MINIMUM = 6
+UNIT_SECOND = 5
+UNIT_MINUTE = 4
+UNIT_HOUR = 3
+UNIT_DAY = 2
+UNIT_WEEK = 1
+def to_pretty_time(total_seconds: int, minimum_unit: int=UNIT_SECOND,
+        max_units: int=UNIT_MINIMUM) -> str:
+    if total_seconds == 0:
+        return "0s"
+
+    minutes, seconds = divmod(total_seconds, 60)
+    hours, minutes = divmod(minutes, 60)
+    days, hours = divmod(hours, 24)
+    weeks, days = divmod(days, 7)
+    out = []
+
+    units = 0
+    if weeks and minimum_unit >= UNIT_WEEK and units < max_units:
+        out.append("%dw" % weeks)
+        units += 1
+    if days and minimum_unit >= UNIT_DAY and units < max_units:
+        out.append("%dd" % days)
+        units += 1
+    if hours and minimum_unit >= UNIT_HOUR and units < max_units:
+        out.append("%dh" % hours)
+        units += 1
+    if minutes and minimum_unit >= UNIT_MINUTE and units < max_units:
+        out.append("%dm" % minutes)
+        units += 1
+    if seconds and minimum_unit >= UNIT_SECOND and units < max_units:
+        out.append("%ds" % seconds)
+        units += 1
+    return " ".join(out)
+