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What are the differences between doing something in a period and doing something within a period? Are there any other differences between in and Within in other contexts?

marked as duplicate by David, Sven Yargs, choster, curiousdannii, Laurel Jan 26 at 6:04

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"In" is used with expressions of time to express a period, after which something will happen - I'll see you in a week; I'll be ready in one hour (I'll see you after a week has passed; I'll be ready after one hour has passed.

In

3Expressing the length of time before a future event is expected to happen.

‘I'll see you in fifteen minutes’

In (Oxford Dictionaries)

"Within" is used to express a maximum amount of time, during which something will happen - I'll see you within a week; I'll be ready within one hour (I'll see you no later than one week in the future; I'll be ready no later than one hour in the future).

Within

3 Occurring inside (a particular period of time)

‘tickets were sold out within two hours’ ‘33 per cent offended again within two years of being released’

Within (Oxford Dictionaries)

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