I have two string time. How can I get a duration of period between theese two time? I try to use DateTimeFormatter, but it doesn't work.
val startTime = LocalDate.parse("19:30", DateTimeFormatter.ofPattern("HH:mm"))
val endTime = LocalDate.parse("20:30", DateTimeFormatter.ofPattern("HH:mm"))
val newDate = Period.between(startTime, endTime)
I think it needs to convert both date to millis and then to do a substraction. But I can't understand how to do it! Your advice, please?!
ErrorInfo:
Process: com.example.leetcodedraft, PID: 23723
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.leetcodedraft/com.example.leetcodedraft.MainActivity}: java.time.format.DateTimeParseException: Text '19:30' could not be parsed: Unable to obtain LocalDate from TemporalAccessor: {},ISO resolved to 19:30 of type java.time.format.Parsed
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2913)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3048)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1808)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6669)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
Caused by: java.time.format.DateTimeParseException: Text '19:30' could not be parsed: Unable to obtain LocalDate from TemporalAccessor: {},ISO resolved to 19:30 of type java.time.format.Parsed
at java.time.format.DateTimeFormatter.createError(DateTimeFormatter.java:1920)
at java.time.format.DateTimeFormatter.parse(DateTimeFormatter.java:1855)
at java.time.LocalDate.parse(LocalDate.java:394)
at com.example.leetcodedraft.Test.startTest(Test.kt:16)
at com.example.leetcodedraft.MainActivity.onCreate(MainActivity.kt:36)
at android.app.Activity.performCreate(Activity.java:7136)
at android.app.Activity.performCreate(Activity.java:7127)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1271)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2893)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3048)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1808)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6669)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
Caused by: java.time.DateTimeException: Unable to obtain LocalDate from TemporalAccessor: {},ISO resolved to 19:30 of type java.time.format.Parsed
at java.time.LocalDate.from(LocalDate.java:362)
at java.time.-$$Lambda$Bq8PKq1YWr8nyVk9SSfRYKrOu4A.queryFrom(Unknown Source:0)
at java.time.format.Parsed.query(Parsed.java:226)
at java.time.format.DateTimeFormatter.parse(DateTimeFormatter.java:1851)
at java.time.LocalDate.parse(LocalDate.java:394)
at com.example.leetcodedraft.Test.startTest(Test.kt:16)
at com.example.leetcodedraft.MainActivity.onCreate(MainActivity.kt:36)
at android.app.Activity.performCreate(Activity.java:7136)
at android.app.Activity.performCreate(Activity.java:7127)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1271)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2893)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3048)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1808)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6669)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
After some time, I solved this issue next:
@RequiresApi(Build.VERSION_CODES.O)
private fun setLessonDuration(startTime: String, endTime: String): String {
val start = LocalTime.parse(startTime)
val finish = LocalTime.parse(endTime)
val newDate = Duration.between(start, finish).toKotlinDuration()
var time = if (newDate.inWholeMinutes.toInt() > 60) {
"${newDate.inWholeMinutes.toInt() / 60}ч.${newDate.inWholeMinutes.toInt() - 60}мин."
} else if (newDate.inWholeMinutes.toInt()%60 == 0) {
"${newDate.inWholeHours}ч."
} else "${newDate.inWholeMinutes}мин."
return time
}
Examples of received data: "1ч.45мин., "2ч.", "15мин."
Changes compared to the original code in the question include:
LocalTime instead of LocalDate. Because a LocalDate is a date without time while LocalTime is a time of day without date.Duration instead of Java Period. Period is for years, months and days while Duration is for hours, minutes, seconds and fraction of second, and Kotlin’s Duration has a little more functionality than the one from java.time and better naming of inWholeMinutes.