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Rails: convert UTC DateTime to another time zone

In Ruby/Rails, how do I convert a UTC DateTime to another time zone? 6 Answers 6 ...
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How to get rid of `deprecated conversion from string constant to ‘char*’` warnings in GCC?

So I'm working on an exceedingly large codebase, and recently upgraded to gcc 4.3, which now triggers this warning: 24 Answ...
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MySQL: Insert record if not exists in table

I am trying to execute the following query: 16 Answers 16 ...
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Check existence of directory and create if doesn't exist

I often find myself writing R scripts that generate a lot of output. I find it cleaner to put this output into it's own directory(s). What I've written below will check for the existence of a directory and move into it, or create the directory and then move into it. Is there a better way to approach...
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Link to “pin it” on pinterest without generating a button

I have a page with tens or hundreds of posts, each one with social buttons. I just can't generate all the buttons for each url: it is too slow (facebook, g+, twitter, pinterest... for hundreds of links). So, instead of the facebook share button to be generated on the fly, I use a simple img pointing...
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Fastest way to check if a file exist using standard C++/C++11/C?

...ist in standard C++11, C++, or C. I have thousands of files and before doing something on them I need to check if all of them exist. What can I write instead of /* SOMETHING */ in the following function? ...
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What is the difference between an expression and a statement in Python?

...", which can be any Python object. Examples: 3 + 5 map(lambda x: x*x, range(10)) [a.x for a in some_iterable] yield 7 Statements (see 1, 2), on the other hand, are everything that can make up a line (or several lines) of Python code. Note that expressions are statements as well. Examples: # a...
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Which HTML Parser is the best? [closed]

I code a lot of parsers. Up until now, I was using HtmlUnit headless browser for parsing and browser automation. 3 Answers ...
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Can I change the fill color of an svg path with CSS?

I have the following code: 8 Answers 8 ...
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How do you iterate through every file/directory recursively in standard C++?

How do you iterate through every file/directory recursively in standard C++? 16 Answers ...