Date utility methods

Dates.groovy

import java.text.*

class Dates {
   static final DATE_TIME = "yyyy-MM-dd HH:mm:ss"
   static final EUROPEAN = "dd/MM/yyyy"
   static final HSQLDB = "yyyy-MM-dd HH:mm:ss.SSS"
   static final ISO = "yyyy-MM-dd'T'HH:mm:ss.SSS"
   static final YEAR_MONTH_DAY = "yyyy-MM-dd"
   static final YEAR_MONTH_DAY_HOUR_MINUTE = "yyyy-MM-dd (HH:mm)"
   static final MONTH_DAY_YEAR = "MM/dd/yyyy"
   static final WEEKDAY_SHORT = "EEE"
   static final WEEK = "w"
   static final WEEK_YEAR = "ww-YY"

   static def getLastMonday(final date){
      def day = new Date().parse(YEAR_MONTH_DAY, date)
      day.clearTime()
      format(day - day.calendarDate.dayOfWeek + 2, YEAR_MONTH_DAY)
   }

   static def format(date, pattern = ISO) {
      date ? date.format(pattern) : ""
   }

   static def parse(text, pattern = ISO) {
      text ? Date.parse(pattern, text) : null
   }

   static def timestamp(date = null) {
      date ? new java.sql.Timestamp(date.time) : new java.sql.Timestamp(System.currentTimeMillis())
   }

   static def isDay(date, day) {
      format(WEEKDAY_SHORT, date) == day
   }

   static def isWeekday(String day) {
      (day != "Sat") && (day != "Sun")
   }

   static def isWeekday(Date date) {
      isWeekday(format(date, WEEKDAY_SHORT))
   }

   static def isMonday(String day) {
      (day == "Mon")
   }

   static def isMonday(Date date) {
      isMonday(format(date, WEEKDAY_SHORT))
   }

   static def getMondays(startDate, endDate, pattern = null) {
      def mondays = (startDate .. endDate).findAll { isMonday(it) }
      pattern ? mondays.collect { format(it, pattern) } : mondays
   }

   static def getWeekdays(startDate, endDate, pattern = null) {
      def weekdays = (startDate .. endDate).findAll { isWeekday(it) }
      pattern ? weekdays.collect { format(it, pattern) } : weekdays
   }

   static def getMinSec(startTime) {
      def duration = (System.currentTimeMillis() - startTime) / 1000
      def min = (int) (duration / 60)
      def sec = duration - (min * 60)

      "$min min, $sec sec"
   }
}