timeconv

Package timeconv provides some simple function to convert go time.Time values.

The function AddDate in package time adds dates passed in format of years, months and days. In the biginning, I thought it did handle different date of month. However, it is NOT.

For example, in many case in real life, if a month is added to 2019-01-31, the result should be 2019-01-28, identifying last day of the month. But the result with AddDate in package time will be 2019-03-03 (Playground)

This simple package timeconv provides a simple alternate of AddDate function, it focus on month operation and corrects result day for return. Please refer to the demo below for usage:

package main

import (
	"fmt"
	"time"
	"github.com/Andrew-M-C/go.timeconv"
)

func main() {
	t := time.Date(2019, 1, 31, 0, 0, 0, 0, time.UTC)
	nt := t.AddDate(0, 1, 0)	// Add one month
	fmt.Printf("%v\n", nt)		// 2019-03-03 00:00:00 +0000 UTC, not expected

	nt = timeconv.AddDate(t, 0, 1, 0)
	fmt.Printf("%v\n", nt)		// 2019-02-28 00:00:00 +0000 UTC
}

Playground

Additionally, there is a pointer version: func AddDateP(t *time.Time, years, months, days int)