feat: Add time constants for Day, Week, Month, and Year

README.md

@@ -190,6 +190,7 @@ Supported helpers for time and duration:
 
 - [Duration](#duration)
 - [Duration0 -> Duration10](#duration0---duration10)
+- [Time Constants](#time-constants)
 
 Supported helpers for channels:
 
@@ -1889,6 +1890,30 @@ str, nbr, err, duration := lo.Duration3(func() (string, int, error) {
 // 3s
 ```
 
+### Time Constants
+
+Predefined time constants for easy, consistent access without repeating calculations like `24 * time.Hour`.
+
+```go
+const (
+    Day   = 24 * time.Hour
+    Week  = 7 * Day
+    Month = 30 * Day
+    Year  = 365 * Day
+)
+```
+
+Example usage:
+```go
+    fmt.Println(lo.Day)   // 24h0m0s
+    fmt.Println(lo.Week)  // 168h0m0s
+    fmt.Println(lo.Month) // 720h0m0s
+    fmt.Println(lo.Year)  // 8760h0m0s
+
+    deadline := time.Now().Add(lo.Week) // Adds 7 days
+```
+Using these constants helps avoid repetition and improves readability.
+
 ### ChannelDispatcher
 
 Distributes messages from input channels into N child channels. Close events are propagated to children.

time.go

@@ -2,6 +2,13 @@ package lo
 
 import "time"
 
+const (
+	Day   = 24 * time.Hour
+	Week  = 7 * Day
+	Month = 30 * Day
+	Year  = 365 * Day
+)
+
 // Duration returns the time taken to execute a function.
 func Duration(cb func()) time.Duration {
 	return Duration0(cb)

time_test.go

@@ -7,6 +7,16 @@ import (
 	"github.com/stretchr/testify/assert"
 )
 
+func TestTimeConstants(t *testing.T) {
+	t.Parallel()
+	is := assert.New(t)
+
+	is.Equal(24*time.Hour, Day, "Day constant should be 24 hours")
+	is.Equal(7*Day, Week, "Week constant should be 7 days")
+	is.Equal(30*Day, Month, "Month constant should be 30 days")
+	is.Equal(365*Day, Year, "Year constant should be 365 days")
+}
+
 func TestDuration(t *testing.T) {
 	t.Parallel()
 	is := assert.New(t)