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There is a newer version: 0.10.11

package invirt.utils

import java.time.Instant
import java.time.LocalDate
import java.time.format.DateTimeFormatter
import java.time.temporal.ChronoUnit

fun Instant.plusDays(days: Int): Instant {
    return this.plus(days.toLong(), ChronoUnit.DAYS)
}

fun Instant.minusDays(days: Int): Instant {
    return this.minus(days.toLong(), ChronoUnit.DAYS)
}

fun LocalDate.dayOfMonthSuffix(): String {
    if (dayOfMonth in 11..13) {
        return "th";
    }
    return when (dayOfMonth % 10) {
        1 -> "st";
        2 -> "nd";
        3 -> "rd";
        else -> "th"
    }
}

private val REGEX_DAY_PATTERN = "d(\\s|$)".toRegex()
fun LocalDate.patternWithDaySuffix(pattern: String): String {
    return pattern.replace(REGEX_DAY_PATTERN, "d'" + dayOfMonthSuffix() + "'$1")
}

fun LocalDate.formatWithDaySuffix(pattern: String): String {
    return format(DateTimeFormatter.ofPattern(patternWithDaySuffix(pattern)))
}