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`time` is Go’s standard library package for working with:

• current time
• durations
• sleeping/timers
• parsing and formatting dates/times
• time zones and locations

• Create timestamps for logs/events.
• Measure elapsed time and performance.
• Set timeouts and deadlines (often with `context`).
• Schedule work with timers/tickers.
• Parse/format time strings (RFC3339, custom layouts).

• `time.Time`: a point in time (date + time + location)
• `time.Duration`: a length of time (e.g., 200ms, 5s)
• `time.Location`: time zone info (e.g., UTC, Asia/Ho_Chi_Minh)

• `time.Now()`: current local time
• `time.Since(t)`: elapsed duration since `t`
• `time.Until(t)`: duration until `t`
• `time.Sleep(d)`: sleep for duration `d`
• `time.Parse(layout, value)`: parse string into `time.Time`
• `t.Format(layout)`: format `time.Time` into string
• `time.NewTimer(d)`: one-shot timer
• `time.NewTicker(d)`: periodic ticker

now := time.Now()
fmt.Println(now)

start := time.Now()
// do work...
elapsed := time.Since(start)
fmt.Println("elapsed:", elapsed)

time.Sleep(500 * time.Millisecond)

t, err := time.Parse(time.RFC3339, "2026-01-09T10:30:00+07:00")
if err != nil { return err }
 
s := t.Format(time.RFC3339)
fmt.Println(s)

Go uses a reference time to define layouts: `