diff --git a/src/util.py b/src/util.py
index 7dddf4d..671296b 100644
--- a/src/util.py
+++ b/src/util.py
@@ -25,13 +25,14 @@ number = "(-?[0-9]+(?:\.[0-9]+)?)(" + "|".join(prefixes.keys()) + ")?"
 
 # from here: https://github.com/Rapptz/RoboDanny/blob/18b92ae2f53927aedebc25fb5eca02c8f6d7a874/cogs/utils/time.py
 short_timedelta_regex = re.compile(f"""
-(?:(?P<years>{number})(?:years?|y))?        # e.g. 2y
-(?:(?P<months>{number})(?:months?|mo))?     # e.g. 2months
-(?:(?P<weeks>{number})(?:weeks?|w))?        # e.g. 10w
-(?:(?P<days>{number})(?:days?|d))?          # e.g. 14d
-(?:(?P<hours>{number})(?:hours?|h))?        # e.g. 12h
-(?:(?P<minutes>{number})(?:minutes?|m))?    # e.g. 10m
-(?:(?P<seconds>{number})(?:seconds?|s))?    # e.g. 15s """, re.VERBOSE)
+(?:(?P<years>{number})(?:years?|y))?                # e.g. 2y
+(?:(?P<months>{number})(?:months?|mo))?             # e.g. 2months
+(?:(?P<fortnights>{number})(?:fortnights?|fn|f))?   # e.g. 10fn
+(?:(?P<weeks>{number})(?:weeks?|w))?                # e.g. 10w
+(?:(?P<days>{number})(?:days?|d))?                  # e.g. 14d
+(?:(?P<hours>{number})(?:hours?|h))?                # e.g. 12h
+(?:(?P<minutes>{number})(?:minutes?|m))?            # e.g. 10m
+(?:(?P<seconds>{number})(?:seconds?|s))?            # e.g. 15s """, re.VERBOSE)
 
 def parse_prefixed(s):
     match = re.match(number, s)
@@ -45,6 +46,8 @@ def parse_short_timedelta(text):
     match = short_timedelta_regex.fullmatch(text)
     if match is None or not match.group(0): raise ValueError("parse failed")
     data = { k: parse_prefixed(v) if v else 0 for k, v in match.groupdict().items() }
+    data["weeks"] += data["fortnights"] * 2
+    del data["fortnights"]
     return datetime.datetime.now(tz=datetime.timezone.utc) + relativedelta(**data)
 
 cal = parsedatetime.Calendar()