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How to calculate number of days between two given dates?

If I have two dates (ex. '8/18/2008' and '9/26/2008' ), what is the best way to get the number of days between these two dates? ...
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How do I pass a variable by reference?

The Python documentation seems unclear about whether parameters are passed by reference or value, and the following code produces the unchanged value 'Original' ...
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How to list all users in a Linux group?

How do I list all members of a group in Linux (and possibly other unices)? 20 Answers ...
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An algorithm for inflating/deflating (offsetting, buffering) polygons

How would I "inflate" a polygon? That is, I want to do something similar to this: 12 Answers ...
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Using Enums while parsing JSON with GSON

This is related to a previous question that I asked here earlier 7 Answers 7 ...
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How do I check that multiple keys are in a dict in a single pass?

I want to do something like: 19 Answers 19 ...
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how to check and set max_allowed_packet mysql variable [duplicate]

Hi I am getting the error : 3 Answers 3 ...
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javax vs java package

What's the rationale behind the javax package? What goes into java and what into javax? 7 Answers ...
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UIImageView aspect fit and center

I have an image view, declared programmatically, and I am setting its image, also programmatically. 10 Answers ...
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How to convert int[] to Integer[] in Java?

I'm new to Java and very confused. 13 Answers 13 ...