How to calculate date in kotlin with the given format?-CodePudding

How to see if a user can be unbanned or not between 2 dates?

Hi, I have a given variable which is the date the user was unbanned as end_banned in the format HH:mm:ss dd/MM/YYYY.

val end_banned: String= "15:05:00 12/01/2022"

I want to calculate if at the current time they can be unbanned or not. I have tried with SimpleDateFormat, Calendar, Date... but still haven't found a solution.

I've tried separating each element of seconds, minutes, days... and comparing them with if...else like this:

var cal = Calendar.getInstance()
cal.timeZone = TimeZone.getTimeZone("Asia/Ho_Chi_Minh")

var _hours = cal.get(Calendar.HOUR)
var _minutes = cal.get(Calendar.MINUTE)
var _seconds = cal.get(Calendar.SECOND)
var _day = cal.get(Calendar.DAY_OF_MONTH)
var _month = cal.get(Calendar.MONTH)   1
var _year = cal.get(Calendar.YEAR)

var hours = end_banned.toString().substring(0, 2).toInt()
var minutes = end_banned.toString().substring(3, 5).toInt()
var seconds = end_banned.toString().substring(6, 8).toInt()
var day = end_banned.toString().substring(9, 11).toInt()
var month = end_banned.toString().substring(12, 14).toInt()
var year = end_banned.toString().substring(15).toInt()

if (_year >= year && _month >= month && _day >= day && _hours >= hours && _minutes >= minutes && _seconds >= seconds
    || _year >= year && _month >= month && _day >= day && _hours >= hours && _minutes >= minutes
    || _year >= year && _month >= month && _day >= day && _hours >= hours

    || _year >= year && _month >= month && _day >= day
    || _year >= year && _month >= month
    || _year >= year) {
    println("True")
} else {
    println("False")
}

But it is only true for the first 3 conditions when there are hours, minutes and seconds.

I tried with SimpleDateFormat and Date like this:

var cal = Calendar.getInstance()
cal.timeZone = TimeZone.getTimeZone("Asia/Ho_Chi_Minh")

var hours = cal.get(Calendar.HOUR)
var minutes = cal.get(Calendar.MINUTE)
var seconds = cal.get(Calendar.SECOND)
var day = cal.get(Calendar.DAY_OF_MONTH)
var month = cal.get(Calendar.MONTH)   1
var year = cal.get(Calendar.YEAR)

var sdf = SimpleDateFormat("HH:mm:ss dd/MM/yyyy")
var sdf_unbanned = sdf.parse(end_banned)
var sdf_now = sdf.parse("${hours}:${minutes}:${seconds} ${day}/${month}/${year}")

if (sdf_now.time - sdf_unbanned.time <= 0) {
     println(true)
} else {
     println(false)
}

But this condition always gives an incorrect number if I adjust the now and unbanned variables a few minutes apart (This makes it easier to spot)

CodePudding user response：

I did not fully understand your question Sir, But I assume you want to compare unbanned_date to the current date (now time) if they are the same(we reached the unban date) then it should unban whatever you are unbanning, If so the implementation requires less code to achieve that ,Like this :

 val sdf = SimpleDateFormat("dd/MM/yyyy")
        val strDate: Date = sdf.parse(end_banned)
        if (System.currentTimeMillis() > strDate.getTime()) {
            urbanUser = true // or what ever your logic is 
        }

CodePudding user response：

Shame, I got confused between cal.get(Calendar.HOUR) and cal.get(Calendar.HOUR_OF_DAY)

Because cal.get(Calendar.HOUR) returns only 12h format
And cal.get(Calendar.HOUR_OF_DAY) will return 24h format

I found a workaround and here is the code that I fixed and tested:

var cal = Calendar.getInstance()
cal.timeZone = TimeZone.getTimeZone("Asia/Ho_Chi_Minh")
var sdf = SimpleDateFormat("HH:mm:ss dd/MM/yyyy")

var hour = cal.get(Calendar.HOUR_OF_DAY)
var minute = cal.get(Calendar.MINUTE)
var second = cal.get(Calendar.SECOND)
var day = cal.get(Calendar.DAY_OF_MONTH)
var month = cal.get(Calendar.MONTH)   1
var year = cal.get(Calendar.YEAR)
var now: Date? = sdf.parse("${hour}:${minute}:${second} ${day}/${month}/${year}")
var end: Date? = sdf.parse(end_banned)

return now?.time!! > end?.time!!

Thanks for the help.