Date utils

Date.kt

import java.util.*

fun Date.isSameDay(other: Date, timeZone: TimeZone = TimeZone.getDefault()): Boolean {
    val cal1 = Calendar.getInstance(timeZone).also { it.time = this }
    val cal2 = Calendar.getInstance(timeZone).also { it.time = other }

    return cal1.get(Calendar.DAY_OF_YEAR) == cal2.get(Calendar.DAY_OF_YEAR) &&
            cal1.get(Calendar.YEAR) == cal2.get(Calendar.YEAR)
}

fun Date.isYesterday(timeZone: TimeZone = TimeZone.getDefault()): Boolean {
    val yesterday = Calendar.getInstance(timeZone).apply { add(Calendar.DAY_OF_YEAR, -1) }
    return this.isSameDay(yesterday.time, timeZone)
}