diff --git a/punchcard/punch.py b/punchcard/punch.py
index 243998e..4dd28c6 100644
--- a/punchcard/punch.py
+++ b/punchcard/punch.py
@@ -278,12 +278,36 @@ async def elapsed(ctx, *, arg=""):
             await ctx.send(elapsedError())
 
 
-@bot.command()
-async def productivity(ctx, *, arg=""):
-    arg = arg.split()
-    await ctx.send(str(getProductivity(ctx.author.id, arg[0]+" "+arg[1], arg[2]+" "+arg[3])))
+def prodError():
+    s = """Malformed argument! Use one of the following:
+    p.productivity YYYY-MM-DD YYYY-MM-DD
+    p.productivity YYYY-MM-DD HH:mm:SS HH:mm:SS
+    p.productivity YYYY-MM-DD HH:mm:SS YYYY-MM-DD HH:mm:SS
+    p.dayproductivity YYYY-MM-DD
+    """
+    return s
+
+# Accurate to 3 decimal places because...
 
 
 @bot.command()
-async def dayproductivity(ctx, *, arg=""):
-    await ctx.send(str(getDayProductivity(ctx.author.id, arg)))
+async def productivity(ctx, *, arg=""):
+    arg = arg.split()
+    if (not (1 <= len(arg) <= 4)):
+        await ctx.send(prodError())
+    else:
+        if (len(arg) == 1):
+            arg = [arg[0], "00:00:00", arg[0], "11:59:59"]
+        elif (len(arg) == 2):
+            arg = [arg[0], "00:00:00", arg[1], "11:59:59"]
+        elif (len(arg) == 3):
+            arg = [arg[0], arg[1], arg[0], arg[2]]
+        else:  # len(arg)==4
+            pass
+        try:
+            prod = float(getProductivity(
+                ctx.author.id, arg[0]+" "+arg[1], arg[2]+" "+arg[3]))
+            prod = round(1000*prod)/10
+            await ctx.send(f"Productivity for {arg[0]} {arg[1]} to {arg[2]} {arg[3]} was **{prod}%**")
+        except (IndexError, ValueError):
+            await ctx.send(prodError())
diff --git a/punchcard/utilfuncs.py b/punchcard/utilfuncs.py
index 57bab4f..b7e1f92 100644
--- a/punchcard/utilfuncs.py
+++ b/punchcard/utilfuncs.py
@@ -151,7 +151,7 @@ def diffDatefromDate(start, end):
     diff = end-start
     if (not ("day" in str(diff))):
         diff = "0 days, "+str(diff)
-    if ("-" in diff):
+    if ("-" in str(diff)):
         return "-"+diffDatefromDate(end1, start1)
     diff = str(diff).split(", ")
     hms = diff[1]