diff --git a/lib/von.rb b/lib/von.rb
index dc1782e..aca7616 100644
--- a/lib/von.rb
+++ b/lib/von.rb
@@ -26,12 +26,12 @@ def self.configure
     yield(config)
   end
 
-  def self.increment(field, value=1)
+  def self.increment(field, value=1, timestamp=Time.now)
     parents = field.to_s.sub(PARENT_REGEX, '')
-    total   = increment_counts_for(field, value)
+    total   = increment_counts_for(field, value, timestamp)
 
     until parents.empty? do
-      increment_counts_for(parents, value)
+      increment_counts_for(parents, value, timestamp)
       parents.sub!(PARENT_REGEX, '')
     end
 
@@ -40,23 +40,23 @@ def self.increment(field, value=1)
     raise e if config.raise_connection_errors
   end
 
-  def self.increment_counts_for(field, value=1)
+  def self.increment_counts_for(field, value=1, timestamp=Time.now)
     counter = Counters::Total.new(field)
     total   = counter.increment(value)
 
     if config.periods_defined_for_counter?(counter)
       periods = config.periods[counter.field]
-      Counters::Period.new(counter.field, periods).increment(value)
+      Counters::Period.new(counter.field, periods).increment(value, timestamp)
     end
 
     if config.bests_defined_for_counter?(counter)
       periods = config.bests[counter.field]
-      Counters::Best.new(counter.field, periods).increment(value)
+      Counters::Best.new(counter.field, periods).increment(value, timestamp)
     end
 
     if config.currents_defined_for_counter?(counter)
       periods = config.currents[counter.field]
-      Counters::Current.new(counter.field, periods).increment(value)
+      Counters::Current.new(counter.field, periods).increment(value, timestamp)
     end
 
     total
diff --git a/lib/von/counters/best.rb b/lib/von/counters/best.rb
index 888b18c..756d792 100644
--- a/lib/von/counters/best.rb
+++ b/lib/von/counters/best.rb
@@ -28,17 +28,17 @@ def current_timestamp(time_unit)
         hget("#{hash_key}:#{time_unit}:current", 'timestamp')
       end
 
-      def increment(value=1)
+      def increment(value=1, timestamp=Time.now)
         return if @periods.empty?
 
         @periods.each do |period|
           _current_timestamp = current_timestamp(period.time_unit)
           _current_total     = current_total(period.time_unit)
 
-          if period.timestamp != _current_timestamp
+          if period.timestamp(timestamp) != _current_timestamp
             # changing current period
             hset("#{hash_key}:#{period.time_unit}:current", 'total', value)
-            hset("#{hash_key}:#{period.time_unit}:current", 'timestamp', period.timestamp)
+            hset("#{hash_key}:#{period.time_unit}:current", 'timestamp', period.timestamp(timestamp))
 
             if best_total(period) < _current_total
               hset("#{hash_key}:#{period.time_unit}:best", 'total', _current_total)
diff --git a/lib/von/counters/current.rb b/lib/von/counters/current.rb
index 1209403..e050774 100644
--- a/lib/von/counters/current.rb
+++ b/lib/von/counters/current.rb
@@ -20,13 +20,13 @@ def current_timestamp(time_unit)
         hget("#{hash_key}:#{time_unit}", 'timestamp')
       end
 
-      def increment(value=1)
+      def increment(value=1, timestamp=Time.now)
         return if @periods.empty?
 
         @periods.each do |period|
-          if period.timestamp != current_timestamp(period.time_unit)
+          if period.timestamp(timestamp) != current_timestamp(period.time_unit)
             hset("#{hash_key}:#{period.time_unit}", 'total', value)
-            hset("#{hash_key}:#{period.time_unit}", 'timestamp', period.timestamp)
+            hset("#{hash_key}:#{period.time_unit}", 'timestamp', period.timestamp(timestamp))
           else
             hincrby("#{hash_key}:#{period.time_unit}", 'total', value)
           end
diff --git a/lib/von/counters/period.rb b/lib/von/counters/period.rb
index 2d9ef9c..4a4098d 100644
--- a/lib/von/counters/period.rb
+++ b/lib/von/counters/period.rb
@@ -18,17 +18,17 @@ def list_key(time_unit)
         "#{Von.config.namespace}:lists:#{@field}:#{time_unit}"
       end
 
-      def increment(value=1)
+      def increment(value=1, timestamp=Time.now)
         return if @periods.empty?
 
         @periods.each do |period|
           _hash_key = hash_key(period.time_unit)
           _list_key = list_key(period.time_unit)
 
-          hincrby(_hash_key, period.timestamp, value)
+          hincrby(_hash_key, period.timestamp(timestamp), value)
 
-          unless lrange(_list_key, 0, -1).include?(period.timestamp)
-            rpush(_list_key, period.timestamp)
+          unless lrange(_list_key, 0, -1).include?(period.timestamp(timestamp))
+            rpush(_list_key, period.timestamp(timestamp))
           end
 
           if llen(_list_key) > period.length
diff --git a/lib/von/counters/total.rb b/lib/von/counters/total.rb
index 9e735ac..4117063 100644
--- a/lib/von/counters/total.rb
+++ b/lib/von/counters/total.rb
@@ -21,7 +21,7 @@ def hash_key
       # If the key has time periods specified, increment those.
       #
       # Returns the Integer total for the key
-      def increment(value=1)
+      def increment(value=1, timestamp=nil)
         hincrby(hash_key, 'total', value).to_i
       end
 
diff --git a/lib/von/period.rb b/lib/von/period.rb
index a6fecbf..c6ae5dc 100644
--- a/lib/von/period.rb
+++ b/lib/von/period.rb
@@ -61,8 +61,8 @@ def prev(unit = 1)
       beginning(unit.send(time_unit.to_sym).ago).strftime(@format)
     end
 
-    def timestamp
-      beginning(Time.now).strftime(format)
+    def timestamp(time=Time.now)
+      beginning(time).strftime(format)
     end
 
     def self.unit_to_period(time_unit)
diff --git a/test/counters/best_test.rb b/test/counters/best_test.rb
index da03e28..0a22406 100644
--- a/test/counters/best_test.rb
+++ b/test/counters/best_test.rb
@@ -15,10 +15,8 @@
 
     counter.increment
 
-    Timecop.freeze(Time.local(2013, 01, 02))
-    4.times { counter.increment(2) }
-    Timecop.freeze(Time.local(2013, 01, 03))
-    3.times { counter.increment }
+    4.times { counter.increment(2, Time.local(2013, 01, 02)) }
+    3.times { counter.increment(1, Time.local(2013, 01, 03)) }
 
     @redis.hget('von:counters:bests:foo:day:current', 'timestamp').must_equal '2013-01-03'
     @redis.hget('von:counters:bests:foo:day:current', 'total').must_equal '3'
@@ -34,10 +32,8 @@
 
     counter.increment
 
-    Timecop.freeze(Time.local(2013, 01, 13, 06, 05))
-    4.times { counter.increment(2) }
-    Timecop.freeze(Time.local(2013, 01, 20, 06, 10))
-    3.times { counter.increment }
+    4.times { counter.increment(2, Time.local(2013, 01, 13, 06, 05)) }
+    3.times { counter.increment(1, Time.local(2013, 01, 20, 06, 10)) }
 
     @redis.hget('von:counters:bests:foo:minute:current', 'timestamp').must_equal '2013-01-20 06:10'
     @redis.hget('von:counters:bests:foo:minute:current', 'total').must_equal '3'
diff --git a/test/counters/current_test.rb b/test/counters/current_test.rb
index b71ba07..28d01b4 100644
--- a/test/counters/current_test.rb
+++ b/test/counters/current_test.rb
@@ -14,8 +14,7 @@
     counter = CurrentCounter.new('foo', [ Von::Period.new(:day) ])
 
     4.times { counter.increment }
-    Timecop.freeze(Time.local(2013, 01, 02))
-    3.times { counter.increment(2) }
+    3.times { counter.increment(2, Time.local(2013, 01, 02)) }
 
     @redis.hget('von:counters:currents:foo:day', 'timestamp').must_equal '2013-01-02'
     @redis.hget('von:counters:currents:foo:day', 'total').must_equal '6'
@@ -28,8 +27,7 @@
     ])
 
     4.times { counter.increment }
-    Timecop.freeze(Time.local(2013, 01, 20, 06, 10))
-    3.times { counter.increment(2) }
+    3.times { counter.increment(2, Time.local(2013, 01, 20, 06, 10)) }
 
     @redis.hget('von:counters:currents:foo:minute', 'timestamp').must_equal '2013-01-20 06:10'
     @redis.hget('von:counters:currents:foo:minute', 'total').must_equal '6'
@@ -45,8 +43,7 @@
     ])
 
     4.times { counter.increment }
-    Timecop.freeze(Time.local(2013, 01, 01, 06, 10))
-    3.times { counter.increment(2) }
+    3.times { counter.increment(2, Time.local(2013, 01, 01, 06, 10)) }
 
     counter.count(:minute).must_equal 6
     counter.count(:day).must_equal 10
diff --git a/test/counters/period_test.rb b/test/counters/period_test.rb
index 78fc79c..06bab94 100644
--- a/test/counters/period_test.rb
+++ b/test/counters/period_test.rb
@@ -42,8 +42,7 @@
     ])
 
     counter.increment
-    Timecop.freeze(Time.local(2013, 02))
-    counter.increment(5)
+    counter.increment(5, Time.local(2013, 02))
 
     @redis.hget('von:counters:foo:month', '2013-02').must_equal '5'
     @redis.lrange('von:lists:foo:month', 0, -1).size.must_equal 1
@@ -59,11 +58,20 @@
 
     counter.increment
     counter.increment
-    Timecop.freeze(Time.local(2013, 02, 01, 7))
-    counter.increment(5)
-    Timecop.freeze(Time.local(2013, 02, 01, 9))
-    counter.increment
+    counter.count(:month).must_equal [{ timestamp: "2013-01", count: 2 }]
+    counter.count(:hour).must_equal [
+      { timestamp: "2012-12-31 20:00", count: 0 },
+      { timestamp: "2012-12-31 21:00", count: 0 },
+      { timestamp: "2012-12-31 22:00", count: 0 },
+      { timestamp: "2012-12-31 23:00", count: 0 },
+      { timestamp: "2013-01-01 00:00", count: 0 },
+      { timestamp: "2013-01-01 01:00", count: 2 }
+    ]
 
+    counter.increment(5, Time.local(2013, 02, 01, 7))
+    counter.increment(1, Time.local(2013, 02, 01, 9))
+
+    Timecop.freeze(Time.local(2013, 02, 01, 9))
     counter.count(:month).must_equal [{ timestamp: "2013-02", count: 6 }]
     counter.count(:hour).must_equal [
       { timestamp: "2013-02-01 04:00", count: 0 },