timeleap
a javascript library that helps testing date-dependent web applications
getting started
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let's suppose today [new Date()] is: 10/01/2017
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simulate a whole date (in future or past): timeleap.goto({year: 2018, month: 12, day: 20}) // new Date() -> 20/12/2018
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simulate year and month but keep system day: timeleap.goto({year: 2018, month: 4}) // new Date() -> 10/4/2018
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simulate only year and keep system month and day: timeleap.goto({year: 2018}) // new Date() -> 10/1/2018
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simulate only month and keep system year and day: timeleap.goto({month: 4}) // new Date() -> 10/4/2017
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simulate only day and keep system year and month: timeleap.goto({day: 20}) // new Date() -> 20/1/2017
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stop simulation and go back to system date: timeleap.back();