How to Construct a time.Time Instance with a Specific Timezone Offset in Go?

Constructing time.Time with Timezone Offset

In the realm of time-keeping, it's crucial to handle time zones accurately for sophisticated applications. This involves constructing time.Time instances that incorporate specific timezone offsets.

Let's take the example of an Apache log entry:

[07/Mar/2004:16:47:46 -0800]

After successfully parsing the individual components (year, month, day, hour, minute, second, and timezone), the next step is to construct a time.Time instance that incorporates the "-0800" timezone offset.

Using time.FixedZone()

For this purpose, you can utilize time.FixedZone(). This function allows you to construct a time.Location with a fixed offset. Here's an example:

loc := time.FixedZone("myzone", -8*3600)
nativeDate := time.Date(2019, 2, 6, 0, 0, 0, 0, loc)
fmt.Println(nativeDate)

Output:

2019-02-06 00:00:00 -0800 myzone

Using time.Parse()

If the timezone offset is available as a string, you can use time.Parse() to interpret it. Employ a layout string that solely contains the reference zone offset:

t, err := time.Parse("-0700", "-0800")
fmt.Println(t, err)

Output:

0000-01-01 00:00:00 -0800 -0800 <nil></nil>

As evident from the output, the resulting time.Time has a zone offset of -0800 hours.

Complete Example

Incorporating the above techniques, the original example can be rewritten as follows:

t, err := time.Parse("-0700", "-0800")
if err != nil {
    panic(err)
}

nativeDate := time.Date(2019, 2, 6, 0, 0, 0, 0, t.Location())
fmt.Println(nativeDate)

Output:

2019-02-06 00:00:00 -0800 -0800

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