Why does SPY hourly show a gap, but not daily on Jan 30, 2018?

See attached screen shots.
SPYHourlyGap.png
SPYDailyNoGap.png
 
I think the answer is: someone didn't want an unfilled gap on the chart.

That was either some quick thinking or pre-planned.

How else can you explain a High with no trades intraday?
 
I suspect its where the data for the higher time-frame is drawn from. On real-time charts from my provider, e.g., the last 4 hourly bar of each day starts at 2200 and is labelled as a H4 bar for that date. But it closes at 0200 on the next day. If a new high prints within a bar that bridges midnight, which day does your provider allocate this data to? From where do they draw the daily high etc.?
 
I think the answer is: someone didn't want an unfilled gap on the chart.

That was either some quick thinking or pre-planned.

How else can you explain a High with no trades intraday?
%%%
barchart hourly data, usually good ,shows$283.29, intraday.; 284.74, end of day. IBD has $284.74. 1 + 5 minute + yahoo charts are known for being inaccurate. Even barchart has plenty of errors on volume so bad intraday day errors are common. In a bear market i tend to go with lower number; bull market like we are in= higher number, IBD almost always has no errors.

And with a % of errors, intraday +daily charts have more errors than weekly:cool::cool:
 
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