英文:
Golang deduct a specific time for a date
问题
我有一个类似于2014-10-22 00:00的日期，我想要减去330分钟，以下是我使用的代码，但是它不起作用，我尝试使用负的持续时间来减少时间，然而时间并没有减少。原本的"开始日期"是2014-12-29 00:00，在减去之后，仍然是2014-12-29 00:00，这意味着减法没有起作用。
layoutStart := "2006-01-02 15:04"
layoutEnd := "2006-01-02 15:04"
var st time.Time
var et time.Time
var err error
var err2 error
var neg_india_offset = time.Duration(-330) * time.Minute
if st, err = time.Parse(layoutStart, startDate); err == nil {
log.Printf("开始时间解析成功: %v", st)
st = st.Add(neg_india_offset)
log.Printf("开始时间减去330分钟: %v", st)
} else {
log.Printf("解析开始时间失败: %v", err)
}
if et, err2 = time.Parse(layoutEnd, endDate); err2 == nil {
log.Printf("结束时间解析成功: %v", et)
et = et.Add(neg_india_offset)
log.Printf("结束时间减去330分钟: %v", et)
} else {
log.Printf("解析结束时间失败: %v", err2)
}
希望这可以帮助你解决问题。
英文:
I have a date in golang like 2014-10-22 00:00 , and I want to deduct in 330 minutes , the following is the code I used, however, it does not works, I tried to reduce the time with negative duration, however , the time is not reduced. Originally, "Start date" is 2014-12-29 00::00, after deduction, it is still 2014-12-29 00:00, that means the deduction is not work.
layoutStart := "2006-01-02 15:04"
layoutEnd := "2006-01-02 15:04"
var st time.Time
var et time.Time
var err error
var err2 error
var neg_india_offset = time.Duration(-330) * time.Minute
//var day_offset time.Duration = 1439 * time.Minute
if st, err = time.Parse(layoutStart, startDate); err == nil {
log.Printf("Start Time decoded: %v", st)
st.Add(neg_india_offset)
log.Printf("Start Time deduct: %v", st)
} else {
log.Printf("Failed to decode start time: %v", err)
}
if et, err2 = time.Parse(layoutEnd, endDate); err2 == nil {
log.Printf("End Time decoded: %v", et)
st.Add(neg_india_offset)
log.Printf("End Time added day: %v", et)
} else {
log.Printf("Failed to decode end time: %v", err2)
}
答案1
得分: 1
函数time.Time.Add()不会覆盖其参数，而是返回新的时间。将以下行代码进行修改：
st.Add(neg_india_offset)
修改为：
st = st.Add(neg_india_offset)
如果你想要获取一个特定时区的日期，请查看time.ParseInLocation()函数。它可以解析指定时区的日期，使用方法如下：
loc, err := time.LoadLocation("India/Delhi")
// ...
st, err = time.ParseInLocation(layoutStart, startDate, loc)
英文:
The function time.Time.Add() does not overwrite its argument. It returns the new time. Change the line
st.Add(neg_india_offset)
to
st = st.Add(neg_india_offset)
If you want to get a date with a specific time-zone, have a look at the time.ParseInLocation() function. It can parse a date for a specified time zone; use it like this:
loc, err := time.LoadLocation("India/Delhi")
// ...
st, err = time.ParseInLocation(layoutStart, startDate, loc)
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