feat(common): UTC 상대 시간 포매터를 추가한다

app/src/main/java/kr/co/vividnext/sodalive/common/RelativeTimeFormatter.kt

@@ -0,0 +1,98 @@
+package kr.co.vividnext.sodalive.common
+
+import android.content.Context
+import kr.co.vividnext.sodalive.R
+import java.text.ParseException
+import java.text.SimpleDateFormat
+import java.util.Calendar
+import java.util.Date
+import java.util.Locale
+import java.util.TimeZone
+
+fun formatUtcRelativeTimeText(context: Context, utcText: String?): String {
+    val pastMillis = parseServerUtcToMillis(utcText)
+        ?: return context.getString(R.string.character_comment_time_just_now)
+
+    val nowMillis = System.currentTimeMillis()
+    var diff = nowMillis - pastMillis
+    if (diff < 0) diff = 0
+
+    val minute = 60_000L
+    val hour = 60 * minute
+    val day = 24 * hour
+
+    if (diff < minute) {
+        return context.getString(R.string.character_comment_time_just_now)
+    }
+
+    if (diff < hour) {
+        val minutes = (diff / minute).toInt()
+        return context.getString(R.string.character_comment_time_minutes, minutes)
+    }
+
+    if (diff < day) {
+        val hours = (diff / hour).toInt()
+        return context.getString(R.string.character_comment_time_hours, hours)
+    }
+
+    if (diff < 30 * day) {
+        val days = (diff / day).toInt()
+        return context.getString(R.string.character_comment_time_days, days)
+    }
+
+    val timeZone = TimeZone.getDefault()
+    val nowCalendar = Calendar.getInstance(timeZone, Locale.getDefault())
+    val pastCalendar = Calendar.getInstance(timeZone, Locale.getDefault())
+    pastCalendar.timeInMillis = pastMillis
+
+    var years = nowCalendar.get(Calendar.YEAR) - pastCalendar.get(Calendar.YEAR)
+    val nowMonth = nowCalendar.get(Calendar.MONTH)
+    val pastMonth = pastCalendar.get(Calendar.MONTH)
+    val nowDay = nowCalendar.get(Calendar.DAY_OF_MONTH)
+    val pastDay = pastCalendar.get(Calendar.DAY_OF_MONTH)
+    if (nowMonth < pastMonth || (nowMonth == pastMonth && nowDay < pastDay)) {
+        years -= 1
+    }
+
+    if (years < 1) {
+        var months = (nowCalendar.get(Calendar.YEAR) - pastCalendar.get(Calendar.YEAR)) * 12 + (nowMonth - pastMonth)
+        if (nowDay < pastDay) months -= 1
+        if (months < 1) months = 1
+        return context.getString(R.string.character_comment_time_months, months)
+    }
+
+    return context.getString(R.string.character_comment_time_years, years)
+}
+
+private fun parseServerUtcToMillis(utcText: String?): Long? {
+    if (utcText.isNullOrBlank()) return null
+
+    val value = utcText.trim()
+    if (value.all { it.isDigit() }) {
+        return try {
+            value.toLong()
+        } catch (_: NumberFormatException) {
+            null
+        }
+    }
+
+    val patterns = listOf(
+        "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'",
+        "yyyy-MM-dd'T'HH:mm:ss'Z'",
+        "yyyy-MM-dd'T'HH:mm:ss",
+        "yyyy-MM-dd HH:mm:ss",
+        "yyyy/MM/dd HH:mm:ss"
+    )
+
+    for (pattern in patterns) {
+        try {
+            val dateFormat = SimpleDateFormat(pattern, Locale.US)
+            dateFormat.timeZone = TimeZone.getTimeZone("UTC")
+            val parsed: Date? = dateFormat.parse(value)
+            if (parsed != null) return parsed.time
+        } catch (_: ParseException) {
+        }
+    }
+
+    return null
+}