Hey, I figured it out finally. Actually the code here does the job.

Code:
// skipping bars for a certain time period 
	static int BarsMissing = 0;
	if(hour() >= 19 and hour() < 20) // 0 when the current bar has no price quotes   
	{ 
  		TimeFrame = 0; // set to zero when not in frame
  		BarsMissing++;
	}
	else if (hour() == 20 and minute() == 0 )
	{ 
  		TimeFrame = -BarsMissing; //  set TimeFrame to the negative number of skipped bars for ending the frame
  		BarsMissing = 0;
	}
	else
		TimeFrame = 1;	// Normal operation



So, I had it but I didn't see it. Thanks for pushing me in the right direction, again. The reason is I thought Zorro would produce no log file, when skipping bars. But it does and freezes all indicator and other values when TimeFrame is 0. See here:

Quote:
[2408: Thu 17.11.16 18:55] +0 +205 64/3 4825/4826\4824/4824 Close: 4824.00, Ind: 4824.76, AssetFrame: 1, TimeFrame: 1

[2409: Thu 17.11.16 19:00] +0 +187 64/3 4824/4825\4820/4821 Close: 4824.00, Ind: 4824.76, AssetFrame: 1, TimeFrame: 0

[2410: Thu 17.11.16 19:05] +0 +167 64/3 4820/4821\4816/4817 Close: 4824.00, Ind: 4824.76, AssetFrame: 1, TimeFrame: 0

[2411: Thu 17.11.16 19:10] +0 +167 64/3 4815/4818\4813/4817 Close: 4824.00, Ind: 4824.76, AssetFrame: 1, TimeFrame: 0

[2412: Thu 17.11.16 19:15] +0 +170 64/3 4817/4819\4816/4818 Close: 4824.00, Ind: 4824.76, AssetFrame: 1, TimeFrame: 0

[2413: Thu 17.11.16 19:20] +0 +187 64/3 4818/4821\4818/4821 Close: 4824.00, Ind: 4824.76, AssetFrame: 1, TimeFrame: 0

[2414: Thu 17.11.16 19:25] +0 +167 64/3 4819/4821\4817/4817 Close: 4824.00, Ind: 4824.76, AssetFrame: 1, TimeFrame: 0

[2415: Thu 17.11.16 19:30] +0 +150 64/3 4818/4818\4814/4815 Close: 4824.00, Ind: 4824.76, AssetFrame: 1, TimeFrame: 0

[2416: Thu 17.11.16 19:35] +0 +141 64/3 4814/4815\4811/4813 Close: 4824.00, Ind: 4824.76, AssetFrame: 1, TimeFrame: 0

[2417: Thu 17.11.16 19:40] +0 +160 64/3 4813/4817\4813/4816 Close: 4824.00, Ind: 4824.76, AssetFrame: 1, TimeFrame: 0

[2418: Thu 17.11.16 19:45] +0 +153 64/3 4817/4819\4815/4815 Close: 4824.00, Ind: 4824.76, AssetFrame: 1, TimeFrame: 0

[2419: Thu 17.11.16 19:50] +0 +157 64/3 4815/4818\4814/4816 Close: 4824.00, Ind: 4824.76, AssetFrame: 1, TimeFrame: 0

[2420: Thu 17.11.16 19:55] +0 +149 64/3 4816/4817\4814/4814 Close: 4824.00, Ind: 4824.76, AssetFrame: 1, TimeFrame: 0

[2421: Thu 17.11.16 20:00] +0 +166 64/3 4816/4818\4814/4817 Close: 4817.25, Ind: 4823.35, AssetFrame: 1, TimeFrame: -12

[2422: Thu 17.11.16 20:05] +0 +178 64/3 4818/4820\4817/4819 Close: 4819.40, Ind: 4822.36, AssetFrame: 1, TimeFrame: 1