43 lines
939 B
Go
43 lines
939 B
Go
package archive
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import (
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"time"
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)
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type YearMonth struct {
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Year int
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// time.Month is a 1-based month counting system
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Month time.Month
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}
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func CurrentYearMonth() YearMonth {
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return YearMonth{time.Now().Year(), time.Now().Month()}
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}
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func (ym YearMonth) Equals(other YearMonth) bool {
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return ym.Year == other.Year && ym.Month == other.Month
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}
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func (ym YearMonth) Next() YearMonth {
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if ym.Month == time.December {
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return YearMonth{Year: ym.Year + 1, Month: time.January}
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} else {
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return YearMonth{Year: ym.Year, Month: ym.Month + 1}
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}
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}
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func (ym YearMonth) Prev() YearMonth {
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if ym.Month == time.January {
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return YearMonth{Year: ym.Year - 1, Month: time.December}
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} else {
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return YearMonth{Year: ym.Year, Month: ym.Month - 1}
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}
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}
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// Index returns a single int that can be used to compare this YearMonth with
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// other YearMonth objects.
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func (ym YearMonth) Index() int {
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return (ym.Year * 12) + (int(ym.Month) - 1)
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}
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