ISO8601 Duration Parser for Golang. Does not strictly conform to ISO 8601. Supports both weeks and months in the same string and does not round up any numbers.
Adapted from http://github.com/BrianHicks/finch
go get github.com/toowoxx/go-iso8601durationSee duration_test.go for examples.
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Copyright (c) 2014 ChannelMeter
Copyright (c) 2021 Toowoxx IT GmbH
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