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Calculate with periods (format yyyymm)
yyyymm_calc(yyyymm, add_month = 0, add_year = 0)
Vector of periods (format yyyymm)
Input vector of periods (format yyyymm)
How many months to add (can be negative too)
How many years to add (can be negative too)
yyyymm_calc(202412, add_month = 1) yyyymm_calc(c(202411,202412,202501), add_month = -1, add_year = 1)
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