Store every date in the database as an Instant

core/common/src/main/kotlin/mihon/core/common/extensions/Instant.kt

@@ -0,0 +1,14 @@
+package mihon.core.common.extensions
+
+import kotlin.time.Instant
+
+/**
+ * Reads epoch milliseconds from a format that writes 0 for a time it doesn't know, such as the source API, a tracker
+ * or a backup.
+ */
+fun Long.toInstantOrNull(): Instant? = takeIf { it != 0L }?.let(Instant::fromEpochMilliseconds)
+
+/**
+ * Writes epoch milliseconds to a format that takes 0 for a time it doesn't know.
+ */
+fun Instant?.toEpochMillisOrZero(): Long = this?.toEpochMilliseconds() ?: 0L