Added relative date formatting to risk card via DateUtils (#276)

* Added relative date formatting to risk card via DateUtils

* lint fixes

Co-authored-by: harambasicluka <64483219+harambasicluka@users.noreply.github.com>

Corona-Warn-App/src/main/java/de/rki/coronawarnapp/util/formatter/FormatterRiskHelper.kt

@@ -2,12 +2,13 @@
 
 package de.rki.coronawarnapp.util.formatter
 
+import android.content.Context
 import android.content.res.ColorStateList
 import android.graphics.drawable.Drawable
+import android.text.format.DateUtils
 import de.rki.coronawarnapp.CoronaWarnApplication
 import de.rki.coronawarnapp.R
 import de.rki.coronawarnapp.risk.RiskLevelConstants
-import java.text.DateFormat
 import java.util.Date
 
 /*Texter*/
@@ -190,6 +191,15 @@ fun formatRiskActiveTracingDaysInRetentionPeriod(
     }
 }
 
+fun formatRelativeDateTimeString(appContext: Context, date: Date): CharSequence? =
+    DateUtils.getRelativeDateTimeString(
+        appContext,
+        date.time,
+        DateUtils.DAY_IN_MILLIS,
+        DateUtils.DAY_IN_MILLIS * 2,
+        0
+    )
+
 /**
  * Formats the risk card text display of the last time diagnosis keys were
  * successfully fetched from the server
@@ -211,9 +221,7 @@ fun formatTimeFetched(
             if (lastTimeDiagnosisKeysFetched != null) {
                 appContext.getString(
                     R.string.risk_card_body_time_fetched,
-                    DateFormat.getDateTimeInstance(DateFormat.SHORT, DateFormat.MEDIUM).format(
-                        lastTimeDiagnosisKeysFetched
-                    )
+                    formatRelativeDateTimeString(appContext, lastTimeDiagnosisKeysFetched)
                 )
             } else {
                 appContext.getString(R.string.risk_card_body_not_yet_fetched)
@@ -228,10 +236,7 @@ fun formatTimeFetched(
                     if (lastTimeDiagnosisKeysFetched != null) {
                         appContext.getString(
                             R.string.risk_card_body_time_fetched,
-                            DateFormat.getDateTimeInstance(DateFormat.SHORT, DateFormat.MEDIUM)
-                                .format(
-                                    lastTimeDiagnosisKeysFetched
-                                )
+                            formatRelativeDateTimeString(appContext, lastTimeDiagnosisKeysFetched)
                         )
                     } else {
                         appContext.getString(R.string.risk_card_body_not_yet_fetched)