Display dates temporarily instead of block height

plot_statistics.py

 import json
 import math
 import matplotlib.pyplot as plt
+import matplotlib.dates as mdates
+import datetime
 
 SHOW_TARGET_RECOMPUTATION = False
 
@@ -22,29 +24,38 @@ axes = [targetsAxis, compressedSizeAxis, compressedScoreAxis, targetsAxis.twinx(
 
 targets = data['targets']
 
+timestamps = [datetime.datetime.fromtimestamp(timestamp) for timestamp in data['timestamps']]
+
 for x, (target, nextTarget) in enumerate(zip(targets, targets[1:])):
     if nextTarget < target:
-        firstTargetDecreaseCurve = plt.axvline(x = x, color = 'purple', label = 'first target decrease')
+        firstTargetDecreaseCurve = plt.axvline(x = timestamps[x], color = 'purple', label = 'first target decrease')
         break
 
 targetRecomputationCurve = []
 if SHOW_TARGET_RECOMPUTATION:
     for x in range(0, len(targets), 2016):
-        targetRecomputationCurve = [plt.axvline(x = x, alpha = 0.1, label = 'target recomputation')]
+        targetRecomputationCurve = [plt.axvline(x = timestamps[x], alpha = 0.1, label = 'target recomputation')]
 
 for x, (target, nextTarget) in enumerate(zip(targets, targets[1:])):
     if nextTarget > target:
-        targetIncreaseCurve = plt.axvline(x = x, alpha = 0.5, color = 'red', label = 'target increase')
+        targetIncreaseCurve = plt.axvline(x = timestamps[x], alpha = 0.5, color = 'red', label = 'target increase')
 
 axesColors = ['blue', 'green', 'brown', 'orange', 'brown', 'red', 'purple']
 axesLabels = ['targets', 'compressed blockchain size (in blocks)', 'compressed blockchain score', 'constant difficulty compressed blockchain size (in blocks)', 'constant difficulty compressed blockchain score', 'compressed blockchain size keeping all blocks since last m higher block (in blocks)', 'compressed blockchain score keeping all blocks since last m higher block']
 axesYValues = [targets, data['compressSize'], data['compressScore'], dataConstantDifficulty['compressSize'], dataConstantDifficulty['compressScore'], dataKeepingAllBlocksSinceLastMHigherBlock['compressSize'], dataKeepingAllBlocksSinceLastMHigherBlock['compressScore']]
 
+plt.gca().xaxis.set_major_formatter(mdates.DateFormatter('%m/%Y'))
+
 curves = []
 for curvesIndex, (axis, color, label, yValues) in enumerate(zip(axes, axesColors, axesLabels, axesYValues)):
     dashes = (None, None) if curvesIndex != 4 else [1, 25]
     alpha = 1 if curvesIndex != 3 else 0.5
-    curves += axis.plot(yValues, label = label, color = color, dashes = dashes, alpha = alpha)
+    # TODO: remove below
+    # Due to not having exported `timestamps` for every execution:
+    comparableLength = min(len(timestamps), len(yValues))
+    curves += axis.plot(timestamps[:comparableLength], yValues[:comparableLength], label = label, color = color, dashes = dashes, alpha = alpha)
+
+plt.gcf().autofmt_xdate()
 
 targetsAxis.set_yscale('log', base=2)