How to subtract X days from a date using Java calendar?

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Taken from the docs here:

Adds or subtracts the specified amount of time to the given calendar field, based on the calendar’s rules. For example, to subtract 5 days from the current time of the calendar, you can achieve it by calling:

Calendar calendar = Calendar.getInstance(); // this would default to now
calendar.add(Calendar.DAY_OF_MONTH, -5).

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