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How to calculate time in hours between two dates in iOS

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Write bytes to file

I have a hexadecimal string (e.g 0CFE9E69271557822FE715A8B3E564BE ) and I want to write it to a file as bytes. For example, ...
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How to make graphics with transparent background in R using ggplot2?

... output ggplot2 graphics from R to PNG files with transparent background. Everything is ok with basic R graphics, but no transparency with ggplot2: ...
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How can I tell if my server is serving GZipped content?

I have a webapp on a NGinx server. I set gzip on in the conf file and now I'm trying to see if it works. YSlow says it's not, but 5 out of 6 websites that do the test say it is. How can I get a definite answer on this and why is there a difference in the results? ...
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Multiple Type Constraints in Swift

Let's say I have these protocols: 4 Answers 4 ...
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What is the difference between SqlCommand.CommandTimeout and SqlConnection.ConnectionTimeout?

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MySql Table Insert if not exist otherwise update

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Should struct definitions go in .h or .c file?

I've seen both full definitions of struct s in headers and just declarations—is there any advantage to one method over the other? ...
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Can mustache iterate a top-level array?

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Guava: Why is there no Lists.filter() function?

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