Less sugar

app/build.gradle.kts

@@ -79,6 +79,7 @@ android {
     compileOptions {
         sourceCompatibility = JavaVersion.VERSION_1_8
         targetCompatibility = JavaVersion.VERSION_1_8
+        isCoreLibraryDesugaringEnabled = true
     }
 
     packagingOptions {
@@ -101,6 +102,7 @@ android {
 
 dependencies {
     implementation(libs.androidx.core)
+    coreLibraryDesugaring(libs.android.desugarJdkLibs)
 
     implementation(libs.androidx.compose.material3)
     implementation(libs.androidx.lifecycle.runtime.compose)

build-logic/convention/src/main/java/com/sadellie/unitto/ConfigureKotlinAndroid.kt

@@ -21,7 +21,10 @@ package com.sadellie.unitto
 import com.android.build.api.dsl.CommonExtension
 import org.gradle.api.JavaVersion
 import org.gradle.api.Project
+import org.gradle.api.artifacts.VersionCatalogsExtension
 import org.gradle.api.plugins.ExtensionAware
+import org.gradle.kotlin.dsl.dependencies
+import org.gradle.kotlin.dsl.getByType
 import org.jetbrains.kotlin.gradle.dsl.KotlinJvmOptions
 
 internal fun Project.configureKotlinAndroid(
@@ -47,6 +50,7 @@ internal fun Project.configureKotlinAndroid(
         compileOptions {
             sourceCompatibility = JavaVersion.VERSION_1_8
             targetCompatibility = JavaVersion.VERSION_1_8
+            isCoreLibraryDesugaringEnabled = true
         }
 
         buildFeatures {
@@ -75,6 +79,12 @@ internal fun Project.configureKotlinAndroid(
             jvmTarget = JavaVersion.VERSION_1_8.toString()
         }
     }
+
+    val libs = extensions.getByType<VersionCatalogsExtension>().named("libs")
+
+    dependencies {
+        add("coreLibraryDesugaring", libs.findLibrary("android.desugarJdkLibs").get())
+    }
 }
 
 fun CommonExtension<*, *, *, *>.kotlinOptions(block: KotlinJvmOptions.() -> Unit) {

data/epoch/build.gradle.kts

@@ -24,3 +24,7 @@ plugins {
 android {
     namespace = "com.sadellie.unitto.data.epoch"
 }
+
+dependencies {
+    testImplementation(libs.junit)
+}

data/epoch/src/main/java/com/sadellie/unitto/data/epoch/EpochDateConverter.kt

@@ -18,60 +18,33 @@
 
 package com.sadellie.unitto.data.epoch
 
-import java.math.BigDecimal
+import java.time.LocalDateTime
-import java.util.*
+import java.time.ZoneOffset
+import java.time.format.DateTimeFormatter
+import java.time.format.DateTimeParseException
 
 object EpochDateConverter {
+    private val pattern by lazy {
+        DateTimeFormatter.ofPattern("HHmmssddMMyyyy")
+    }
+
     fun convertDateToUnix(date: String): String {
-        // Here we add some zeros, so that input is 14 symbols long
+        return try {
-        val inputWithPadding = date.padEnd(14, '0')
+            // Here we add some zeros, so that input is 14 symbols long
-
+            LocalDateTime
-        // Now we break input that is 14 symbols into pieces
+                .parse(date.padEnd(14, '0'), pattern)
-        val hour = inputWithPadding.substring(0, 2)
+                .toEpochSecond(ZoneOffset.UTC)
-        val minute = inputWithPadding.substring(2, 4)
+        } catch (e: DateTimeParseException) {
-        val second = inputWithPadding.substring(4, 6)
+            0
-        val day = inputWithPadding.substring(6, 8)
+        }.toString()
-        val month = inputWithPadding.substring(8, 10)
-        val year = inputWithPadding.substring(10, 14)
-
-        val cal = Calendar.getInstance()
-        cal.set(
-            year.toIntOrNull() ?: 1970,
-            (month.toIntOrNull() ?: 1) - 1,
-            day.toIntOrNull() ?: 0,
-            hour.toIntOrNull() ?: 0,
-            minute.toIntOrNull() ?: 0,
-            second.toIntOrNull() ?: 0,
-        )
-        return (cal.timeInMillis / 1000).toString()
     }
 
     fun convertUnixToDate(unix: String): String {
-        var date = ""
+        val unixLong = unix.toLong().takeIf { it <= 253402300559L }
-        val cal2 = Calendar.getInstance()
+            ?: throw IllegalArgumentException("Max unix is 253402300559")
-        cal2.clear()
-        cal2.isLenient = true
 
-        // This lets us bypass calendars limits (it uses Int, we want BigDecimal)
+        return LocalDateTime
-        try {
+            .ofEpochSecond(unixLong, 0, ZoneOffset.UTC)
-            val unixBg = BigDecimal(unix.ifEmpty { "0" })
+            .format(pattern)
-            val division = unixBg.divideAndRemainder(BigDecimal(Int.MAX_VALUE))
-            val intTimes = division.component1()
-            val rem = division.component2()
-            repeat(intTimes.intValueExact()) {
-                cal2.add(Calendar.SECOND, Int.MAX_VALUE)
-            }
-            cal2.add(Calendar.SECOND, rem.intValueExact())
-        } catch (e: NumberFormatException) {
-            return ""
-        }
-        date += cal2.get(Calendar.HOUR_OF_DAY).toString().padStart(2, '0')
-        date += cal2.get(Calendar.MINUTE).toString().padStart(2, '0')
-        date += cal2.get(Calendar.SECOND).toString().padStart(2, '0')
-        date += cal2.get(Calendar.DAY_OF_MONTH).toString().padStart(2, '0')
-        date += (cal2.get(Calendar.MONTH) + 1).toString().padStart(2, '0')
-        // Year is 4 symbols long
-        date += cal2.get(Calendar.YEAR).toString().padStart(4, '0')
-        return date
     }
 }

data/epoch/src/test/java/com/sadellie/unitto/data/epoch/DateToEpochTest.kt

@@ -0,0 +1,60 @@
+/*
+ * Unitto is a unit converter for Android
+ * Copyright (c) 2023 Elshan Agaev
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.sadellie.unitto.data.epoch
+
+import org.junit.Assert.assertEquals
+import org.junit.Test
+
+class DateToEpochTest {
+
+    @Test
+    fun `00h0m00s 00 00 0000`() {
+        convertDateToUnixTest("00:00:00 00.00.0000", "0")
+    }
+
+    @Test
+    fun `00h00m00s 01 01 0001`() {
+        convertDateToUnixTest("00:00:00 01.01.0001", "-62135596800")
+    }
+
+    @Test
+    fun `00h00m00s 01 01 1970`() {
+        convertDateToUnixTest("00:00:00 01.01.1970", "0")
+    }
+
+    @Test
+    fun `23h55m59s 31 12 9999`() {
+        convertDateToUnixTest("23:55:59 31.12.9999", "253402300559")
+    }
+
+    @Test
+    fun `99h99m99s 99 99 9999`() {
+        convertDateToUnixTest("99:99:99 99.99.9999", "0")
+    }
+
+    private fun convertDateToUnixTest(inputDate: String, expectedUnix: String) {
+        // Date input comes "fancy"
+        val cleanInputDate = inputDate.filter{ it.isDigit() }
+        assertEquals(
+            "Couldn't convert $inputDate ($cleanInputDate) into unix",
+            expectedUnix,
+            EpochDateConverter.convertDateToUnix(cleanInputDate)
+        )
+    }
+}

data/epoch/src/test/java/com/sadellie/unitto/data/epoch/EpochToDateTest.kt

@@ -0,0 +1,72 @@
+/*
+ * Unitto is a unit converter for Android
+ * Copyright (c) 2023 Elshan Agaev
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.sadellie.unitto.data.epoch
+
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertThrows
+import org.junit.Test
+
+class EpochToDateTest {
+
+    @Test
+    fun `0`() {
+        convertUnixToDate("0", "00:00:00 01.01.1970")
+    }
+
+    @Test
+    fun `00000000000000 max input length`() {
+        convertUnixToDate("00000000000000", "00:00:00 01.01.1970")
+    }
+
+    @Test
+    fun `253402300559 max possible date`() {
+        convertUnixToDate("253402300559", "23:55:59 31.12.9999")
+    }
+
+    @Test
+    fun `2534023005599999 input longe than allowed`() {
+        convertUnixToDate("2534023005599999", "23:55:59 31.12.9999", IllegalArgumentException())
+    }
+
+    @Test
+    fun `99999999999999 max possible unix with max length`() {
+        convertUnixToDate("99999999999999", "23:55:59 31.12.9999", IllegalArgumentException())
+    }
+
+    private fun convertUnixToDate(inputUnix: String, expectedDate: String, throwable: Throwable? = null) {
+        // Date input comes "fancy"
+        val cleanExpectedDate = expectedDate.filter{ it.isDigit() }
+
+        // Will throw
+        if (throwable != null) {
+            assertThrows(
+                "Failed to throw ${throwable.javaClass} when converting $inputUnix into $expectedDate ($cleanExpectedDate)",
+                throwable.javaClass
+            ) { EpochDateConverter.convertUnixToDate(inputUnix) }
+            return
+        }
+
+        // Should actually convert
+        assertEquals(
+            "Couldn't convert $inputUnix into $expectedDate ($cleanExpectedDate)",
+            cleanExpectedDate,
+            EpochDateConverter.convertUnixToDate(inputUnix)
+        )
+    }
+}

feature/epoch/src/main/java/com/sadellie/unitto/feature/epoch/EpochViewModel.kt

@@ -52,9 +52,15 @@ class EpochViewModel @Inject constructor() : ViewModel() {
                 dateToUnix = fromDateToUnix
             )
         } else {
+            val date = try {
+                EpochDateConverter.convertUnixToDate(input)
+            } catch (e: IllegalArgumentException) {
+                ""
+            }
+
             EpochUIState(
                 unixField = input,
-                dateField = EpochDateConverter.convertUnixToDate(input),
+                dateField = date,
                 dateToUnix = fromDateToUnix
             )
         }

gradle/libs.versions.toml

@@ -4,6 +4,7 @@ appName = "Glaucous"
 androidxCore = "1.9.0"
 androidxTest = "1.5.0"
 androidxTestExt = "1.1.4"
+androidDesugarJdkLibs = "2.0.0"
 junit = "4.13.2"
 androidxTestRunner = "1.5.1"
 androidxTestRules = "1.5.0"
@@ -61,6 +62,7 @@ com-squareup-retrofit2 = { group = "com.squareup.retrofit2", name = "converter-m
 com-github-sadellie-themmo = { group = "com.github.sadellie", name = "themmo", version.ref = "comGithubSadellieThemmo" }
 org-burnoutcrew-composereorderable = { group = "org.burnoutcrew.composereorderable", name = "reorderable", version.ref = "orgBurnoutcrewComposereorderable" }
 com-github-sadellie-exprk = { group = "com.github.sadellie", name = "ExprK", version.ref = "comGithubSadellieExprk" }
+android-desugarJdkLibs = { group = "com.android.tools", name = "desugar_jdk_libs", version.ref = "androidDesugarJdkLibs" }
 
 # classpath
 android-gradlePlugin = { group = "com.android.tools.build", name = "gradle", version.ref = "androidGradlePlugin" }