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'Maturity' refers to the final payment date of a loan or other financial instrument, at which point all remaining interest and is due to be paid.
1, 3, 6 months maturity band can be calculated by using 30-day per month periods. For maturity bands over a year it is acceptable to use 365 day per year.
For example with a Treasury Bond, its maturity is the date on which the principal is paid.