Golang : How to check if a date is within certain range?
Problem:
You are processing a large number of raw data files with dates as timestamps. However, you are only interested in processing the files within a certain range of a given date. For example, you want to process files that are two months before and after a given date. How to check if the dates on the files are within the 4 months range?
Solution:
This solution assumes that you've managed to extract(such as using awk
) and isolate the dates from the filenames. It is a fairly simple process....get today's date, figure out the dates 2 months ago and 2 months later. (You can change the 2 months to any numbers you like)
The function below utilizes the time
package Before()
and After()
function to check if the dates are within the 4 months range.
Here you go!
package main
import (
"fmt"
"time"
)
func DateWithinRange(dateString string, dateFormat string) (bool, error) {
dateStamp, err := time.Parse(dateFormat, dateString)
if err != nil {
return false, err
}
today := time.Now()
twoMonthsAgo := today.AddDate(0, -2, 0) // minus 2 months
twoMonthsLater := today.AddDate(0, 2, 0) // plus 2 months
fmt.Println("Given : ", dateStamp.Format("02/01/2006"))
fmt.Println("2 months ago : ", twoMonthsAgo.Format("02/01/2006"))
fmt.Println("2 months later : ", twoMonthsLater.Format("02/01/2006"))
if dateStamp.Before(twoMonthsLater) && dateStamp.After(twoMonthsAgo) {
return true, nil
} else {
return false, nil
}
// default
return false, nil
}
func main() {
// dd/mm/yyyy
result, err := DateWithinRange("27/04/2017", "02/01/2006")
if err != nil {
fmt.Println("Error :", err)
}
// %t to print boolean value in fmt.Printf
fmt.Printf("Given date with range : [%t]\n", result)
// yyyy-dd-mm
result1, err := DateWithinRange("2017-27-04", "2006-02-01")
if err != nil {
fmt.Println("Error :", err)
}
fmt.Printf("Given date with range : [%t]\n", result1)
// out of range example
result2, err := DateWithinRange("2011-27-04", "2006-02-01")
if err != nil {
fmt.Println("Error :", err)
}
fmt.Printf("Given date with range : [%t]\n", result2)
// out of range example
result3, err := DateWithinRange("2018-17-09", "2006-02-01")
if err != nil {
fmt.Println("Error :", err)
}
fmt.Printf("Given date with range : [%t]\n", result3)
}
Output:
Given : 27/04/2017
2 months ago : 27/02/2017
2 months later : 27/06/2017
Given date with range : [true]
Given : 27/04/2017
2 months ago : 27/02/2017
2 months later : 27/06/2017
Given date with range : [true]
Given : 27/04/2011
2 months ago : 27/02/2017
2 months later : 27/06/2017
Given date with range : [false]
Given : 17/09/2018
2 months ago : 27/02/2017
2 months later : 27/06/2017
Given date with range : [false]
References:
https://www.socketloop.com/tutorials/golang-change-date-format-to-yyyy-mm-dd
https://golang.org/pkg/time/#Time.Before
https://golang.org/pkg/time/#Time.After
https://www.socketloop.com/tutorials/golang-integer-is-between-a-range
See also : Golang : Integer is between a range
By Adam Ng
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