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Status](https://github.com/snabb/isoweek/actions/workflows/go.yml/badge.svg)](https://github.com/snabb/isoweek/actions/workflows/go.yml)\n[![codecov](https://codecov.io/gh/snabb/isoweek/branch/master/graph/badge.svg)](https://codecov.io/gh/snabb/isoweek)\n[![Go Report Card](https://goreportcard.com/badge/github.com/snabb/isoweek)](https://goreportcard.com/report/github.com/snabb/isoweek)\n\nThe Go package isoweek calculates a starting date and time of [ISO 8601] week.\n\nISO 8601 standard defines the common [week number] system used in Europe\nand many other countries. Monday is the first day of a week.\n\nThe Go standard library `time` package has `ISOWeek` function\nfor getting ISO 8601 week number of a given `time.Time`, but there is no\nreverse functionality for getting a date from a week number. This package\nimplements that.\n\nInvalid input is silently accepted. There is a separate `Validate`\nfunction if week number validation is needed.\n\nThere are also functions for working with [Julian day numbers]. Using Julian\nday numbers is often the easiest and fastest way to do date calculations.\n\nThis package does not work with the \"traditional\" week system used in\nUS/Canada/Japan/etc. (weeks starting on Sundays). However the Julian day\nnumber functions may be still useful.\n\n[ISO 8601]: https://en.wikipedia.org/wiki/ISO_8601\n[week number]: https://en.wikipedia.org/wiki/ISO_week_date\n[Julian day numbers]: https://en.wikipedia.org/wiki/Julian_day\n\n\nDocumentation\n-------------\n\nhttps://pkg.go.dev/github.com/snabb/isoweek\n\n\nExamples\n--------\n\n### Using weeks with Go standard time.Time\n\nA simple example which gets the starting time of the 1st week of 1985:\n```Go\n\tt := isoweek.StartTime(1985, 1, time.UTC)\n\tfmt.Println(t)\n\t// Output: 1984-12-31 00:00:00 +0000 UTC\n```\nThe returned time may be within a previous year as can be seen above.\n\nThe `AddDate` function in Go standard library `time` package can be used\nfor getting the `Time` at the end of the week or for iterating through weeks:\n```Go\n\tt = t.AddDate(0, 0, 7)\n\tfmt.Println(t)\n\t// Output: 1985-01-07 00:00:00 +0000 UTC\n\n\twyear, week := t.ISOWeek()\n\tfmt.Println(wyear, week)\n\t// Output: 1985 2\n```\n\n### Using weeks, dates and Julian day numbers\n\nThe same as above without using Go standard library `time` package:\n\n```Go\n\ty, m, d := isoweek.StartDate(1985, 1)\n\tfmt.Println(y, m, d)\n\t// Output: 1984 December 31\n\n\tjdn := isoweek.DateToJulian(y, m, d)\n\tjdn = jdn + 7 // next week\n\ty, m, d = isoweek.JulianToDate(jdn)\n\tfmt.Println(y, m, d)\n\t// Output: 1985 January 7\n\n\twyear, week := isoweek.FromDate(y, m, d)\n\tfmt.Println(wyear, week)\n\t// Output: 1985 2\n```\n\n\nRepository\n----------\n\nhttps://github.com/snabb/isoweek\n\n\nLicense\n-------\n\nMIT\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fsnabb%2Fisoweek","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fsnabb%2Fisoweek","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fsnabb%2Fisoweek/lists"}