[移动开发]【java】【kotlin】判断当前日期是星期几、是否为月底；获取当前季度起始时间

用kotlin写的
java代码用intellij可互转，此处不再贴出

• 判断当前日期是星期几

 /**
     * 判断当前日期是星期几
     */
    fun getWeekOfDate(dt: Date): Int {
        val weekDays = arrayOf(7, 1, 2, 3, 4, 5, 6)
        val cal = Calendar.getInstance()
        cal.time = dt
        var w = cal[Calendar.DAY_OF_WEEK] - 1
        if (w < 0) {
            w = 0
        }
        return weekDays[w]
    }

• 判断当前日期是否为月底

/**
     * 判断当前日期是否为月底
     */
    fun isLastDayOfMonth(dt: Date): Boolean {
        val calendar = Calendar.getInstance()
        calendar.time = dt
        calendar.set(Calendar.DATE, (calendar.get(Calendar.DATE) + 1))
        return calendar.get(Calendar.DAY_OF_MONTH) == 1
    }

• 获取当前季度起始时间

/**
     * 获取当前季度起始时间
     */
    fun getCurrentQuarterRangeDay(dt: Date): Pair<String, String> {
        val startDate = getCurrentQuarterStartDate(dt)
        val endDate = getCurrentQuarterEndDate(dt)
        return Pair(getDateStr(startDate), getDateStr(endDate))
    }

    // 获取当前季度开始时间
    private fun getCurrentQuarterStartDate(dt: Date): Date {
        val c = Calendar.getInstance()
        c.time = dt
        val currentMonth = c[Calendar.MONTH] + 1
        var date = dt
        try {
            if (currentMonth in 1..3) {
                c[Calendar.MONTH] = 0
            } else if (currentMonth in 4..6) {
                c[Calendar.MONTH] = 3
            } else if (currentMonth in 7..9) {
                c[Calendar.MONTH] = 6
            } else if (currentMonth in 10..12) {
                c[Calendar.MONTH] = 9
            }
            c[Calendar.DATE] = 1
            date = parseDate(getDateStr(c.time) + " 00:00:00")
        } catch (e: Exception) {
            logger.error(e.message, e)
        }
        return date
    }

    // 获取当前季度结束时间
    private fun getCurrentQuarterEndDate(dt: Date): Date {
        val c = Calendar.getInstance()
        c.time = dt
        val currentMonth = c[Calendar.MONTH] + 1
        var date = dt
        try {
            if (currentMonth in 1..3) {
                c[Calendar.MONTH] = 3
                c[Calendar.DATE] = 31
            } else if (currentMonth in 4..6) {
                c[Calendar.MONTH] = 6
                c[Calendar.DATE] = 30
            } else if (currentMonth in 7..9) {
                c[Calendar.MONTH] = 9
                c[Calendar.DATE] = 30
            } else if (currentMonth in 10..12) {
                c[Calendar.MONTH] = 12
                c[Calendar.DATE] = 31
            }
            c[Calendar.DATE] = 1
            date = parseDate(getDateStr(c.time) + " 23:59:59")
        } catch (e: Exception) {
            logger.error(e.message, e)
        }
        return getDateInterval(date, -1)
    }