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Golang 時間パッケージの例とユーティリティ

Go Timestamp Examples

Complete guide to working with timestamps in Go. Learn time package, formatting, and best practices.

Get Current Timestamp

Get current Unix timestamp in Go

package main

import (
    "fmt"
    "time"
)

func main() {
    // Get current Unix timestamp in seconds
    now := time.Now()
    unixSeconds := now.Unix()
    fmt.Println("Unix seconds:", unixSeconds) // 1729584000
    
    // Get Unix timestamp in milliseconds
    unixMilli := now.UnixMilli()
    fmt.Println("Unix milliseconds:", unixMilli) // 1729584000000
    
    // Get Unix timestamp in nanoseconds
    unixNano := now.UnixNano()
    fmt.Println("Unix nanoseconds:", unixNano)
    
    // Get Unix timestamp in microseconds
    unixMicro := now.UnixMicro()
    fmt.Println("Unix microseconds:", unixMicro)
}

Convert Timestamp to Time

Convert Unix timestamp to time.Time object

package main

import (
    "fmt"
    "time"
)

func main() {
    // From Unix seconds
    timestamp := int64(1729584000)
    t := time.Unix(timestamp, 0)
    fmt.Println(t) // 2024-10-22 01:20:00 +0000 UTC
    
    // From Unix milliseconds
    timestampMilli := int64(1729584000000)
    t2 := time.UnixMilli(timestampMilli)
    fmt.Println(t2)
    
    // From Unix microseconds
    timestampMicro := int64(1729584000000000)
    t3 := time.UnixMicro(timestampMicro)
    fmt.Println(t3)
    
    // Format the time
    formatted := t.Format("2006-01-02 15:04:05")
    fmt.Println(formatted) // "2024-10-22 01:20:00"
}

Parse String to Timestamp

Parse date strings and convert to timestamps

package main

import (
    "fmt"
    "time"
)

func main() {
    // Parse RFC3339 (ISO 8601)
    str := "2024-10-22T01:20:00Z"
    t, err := time.Parse(time.RFC3339, str)
    if err != nil {
        panic(err)
    }
    fmt.Println(t.Unix()) // 1729584000
    
    // Parse custom format
    customStr := "2024-10-22 01:20:00"
    layout := "2006-01-02 15:04:05"
    t2, err := time.Parse(layout, customStr)
    if err != nil {
        panic(err)
    }
    fmt.Println(t2.Unix())
    
    // Parse with timezone
    loc, _ := time.LoadLocation("America/New_York")
    t3, _ := time.ParseInLocation(layout, customStr, loc)
    fmt.Println(t3.Unix())
}

Quick Reference

Get Current Timestamp

time.Now().Unix()time.Now().UnixMilli()time.Now().UnixNano()

Parse Timestamp

time.Unix(sec, 0)time.UnixMilli(ms)time.UnixMicro(micro)

Format Time

t.Format("2006-01-02")t.Format(time.RFC3339)t.Format("01/02/2006")

Parse String

time.Parse(layout, str)time.ParseInLocation(...)time.ParseDuration(str)