Golang 日期/时间包的使用详解

编辑时间/求两个日期的时间差

time.ParseDuration(durationString string)可以方便我们使用语义构建时间跨度值，数值单位为纳秒，比如：
timeDuration, _ := time.ParseDuration("24h")
timeDuration, _ := time.ParseDuration("12m")
timeDuration, _ := time.ParseDuration("6s")
timeDuration, _ := time.ParseDuration("1ms")
timeDuration, _ := time.ParseDuration("1us")
timeDuration, _ := time.ParseDuration("1ns")

// 已当前时间为基增长年/月/日后的时间对象
timerAdded := timer.AddDate(1, 2, 3)
curYear, curMonth, curDay = timerAdded.Date()
fmt.Printf("current date: %d-%02d-%02dn", curYear, curMonth, curDay)

// 以当前时间为基增长N纳秒后的时间对象 比如增长了一天
timeDuration, _ := time.ParseDuration("24h")
timerAdded = timer.Add(timeDuration)
// 计算两个时间的差值 返回的是纳秒 按需求自行计算其他单位
// Duration is type of int64 and nanoseconds
timeDuration = timerAdded.Sub(timer)
fmt.Printf("days duration between %s~%s: %dn",
  timerAdded.Format(timeLayout),
  timer.Format(timeLayout),
  timeDuration/1000/1000/1000/24/60/60)

// 使用时间串获取时间对象
timer, _ = time.Parse(timeLayout, "2018-08-08 08:08:08")
// 使用时间串获取时间对象 并设定时区
timer, _ = time.ParseInLocation(timeLayout, "2018-08-08 08:08:08", timeLocation)
// 使用Unix时间戳构建时间对象
timer = time.Unix(1552368806, 0) //2019-03-12 13:33:26的Unix时间戳
fmt.Println(timer.Format(timeLayout))

// 获取当前时间是本年第几天 本周第几天
fmt.Printf("year day: %d, week day: %dn", timer.YearDay(), timer.Weekday())

// 使用表征字符串转换时间跨度
timeDuration, _ = time.ParseDuration("300s")
fmt.Printf("nanosecond: %dn", timeDuration)
timeDuration, _ = time.ParseDuration("300us")
fmt.Printf("nanosecond: %dn", timeDuration)