bashdates.sh

#!/bin/bash
# Getting floating date, calendar start and end date for day, week, month and year
# main goal is to get dates in epoch format
# the output in human readable format are mainly for debugging purpose

# NOW
function now_epoch () {
  date +%s
}
function now () {
 date
}
echo "Now : $(now)"
echo ""

# DAY
function day_epoch () {
  # $1 : day [integer], 0 = today(default), -1 = yesterday, 1 = tomorrow, etc...
  DAY=$1
  [ -z "$DAY" ] && DAY=0
  date +%s -d "$DAY day"
}
function day_start_epoch () {
  # $1 : day [integer], 0 = today(default), -1 = yesterday, 1 = tomorrow, etc...
  DAY=$1
  [ -z "$DAY" ] && DAY=0
  date +%s -d "$DAY day 0:00"
}
function day_end_epoch () {
  # $1 : day [integer], 0 = today(default), -1 = yesterday, 1 = tomorrow, etc...
  DAY=$1
  [ -z "$DAY" ] && DAY=0
  date +%s -d "$DAY day 23:59:59"
}
function day () {
  # $1 : day [integer], 0 = today(default), -1 = yesterday, 1 = tomorrow, etc...
  date -d "@$(day_epoch $1)"
}
function day_start () {
  # $1 : day [integer], 0 = today(default), -1 = yesterday, 1 = tomorrow, etc...
  date -d "@$(day_start_epoch $1)"
}
function day_end () {
  # $1 : day [integer], 0 = today(default), -1 = yesterday, 1 = tomorrow, etc...
  date -d "@$(day_end_epoch $1)"
}
echo "Yesterday : $(day -1)"
echo "Yesterday start : $(day_start -1)"
echo "Yesterday end : $(day_end -1)"
echo "Today : $(day 0)"
echo "Today start : $(day_start)"
echo "Today end : $(day_end)"
echo "Tomorrow : $(day 1)"
echo "Tomorrow start : $(day_start 1)"
echo "Tomorrow end : $(day_end 1)"
echo ""

# WEEK
function week_epoch () {
  # $1 : week [integer], 0 = this_week(default), -1 = last_week, 1 = next_week, etc...
  WEEK=$1
  [ -z "$WEEK" ] && WEEK=0
  date +%s -d "$WEEK week"
}
function week_start_epoch () {
  # $1 : week [integer], 0 = this_week(default), -1 = last_week, 1 = next_week, etc...
  # $2 : week start day, 0 = sunday, 1 = monday(default)
  WEEK=$1
  WEEK_START_DAY=$2
  [ -z "$WEEK" ] && WEEK=0
  [ -z "$WEEK_START_DAY" ] && WEEK_START_DAY=1
  date +%s -d "$WEEK week -$(($(date +%u)-WEEK_START_DAY)) days 0:00"
}
function week_end_epoch () {
  # $1 : week [integer], 0 = this_week(default), -1 = last_week, 1 = next_week, etc...
  # $2 : week start day, 0 = sunday, 1 = monday(default)
  WEEK=$1
  WEEK_START_DAY=$2
  [ -z "$WEEK" ] && WEEK=0
  [ -z "$WEEK_START_DAY" ] && WEEK_START_DAY=1
  WEEK=$((WEEK+1))
  date +%s -d "$WEEK week -$((7-WEEK_START_DAY-$(date +%u))) days 23:59:59"
}
function week () {
  # $1 : week [integer], 0 = this_week(default), -1 = last_week, 1 = next_week, etc...
  date -d "@$(week_epoch $1)"
}
function week_start () {
  # $1 : week [integer], 0 = this_week(default), -1 = last_week, 1 = next_week, etc...
  # $2 : week start day, 0 = sunday, 1 = monday(default)
  date -d "@$(week_start_epoch $1 $2)"
}
function week_end () {
  # $1 : week [integer], 0 = this_week(default), -1 = last_week, 1 = next_week, etc...
  # $2 : week start day, 0 = sunday, 1 = monday(default)
  date -d "@$(week_end_epoch $1 $2)"
}
echo "Week is starting on Monday"
echo "Last week : $(week -1)"
echo "Last week start : $(week_start -1)"
echo "Last week end : $(week_end -1)"
echo "This week : $(week 0)"
echo "This week start : $(week_start 0)"
echo "This week end : $(week_end 0)"
echo "Next week : $(week 1)"
echo "Next week start : $(week_start 1)"
echo "Next week end : $(week_end 1)"
echo "Week is starting on Sunday"
echo "Last week : $(week -1)"
echo "Last week start : $(week_start -1 0)"
echo "Last week end : $(week_end -1 0)"
echo "This week : $(week 0)"
echo "This week start : $(week_start 0 0)"
echo "This week end : $(week_end 0 0)"
echo "Next week : $(week 1)"
echo "Next week start : $(week_start 1 0)"
echo "Next week end : $(week_end 1 0)"
echo ""

# MONTH
function month_epoch (){
  # $1 : month [integer], 0 = this_month(default), -1 = last_month, 1 = next_month, etc...
  MONTH=$1
  [ -z "$MONTH" ] && MONTH=0
  date +%s -d "$MONTH month"
}
function month_start_epoch (){
  # $1 : month [integer], 0 = this_month(default), -1 = last_month, 1 = next_month, etc...
  MONTH=$1
  [ -z "$MONTH" ] && MONTH=0
  date +%s -d "$MONTH month -$(($(date +%d)-1)) days 0:00"
}
function month_end_epoch (){
  # $1 : month [integer], 0 = this_month(default), -1 = last_month, 1 = next_month, etc...
  MONTH=$1
  [ -z "$MONTH" ] && MONTH=0
  MONTH=$((MONTH+1))
  date +%s -d "$MONTH month -$(date +%d) days 23:59:59"
}
function month () {
  # $1 : month [integer], 0 = this_month(default), -1 = last_month, 1 = next_month, etc...
  date -d "@$(month_epoch $1)"
}
function month_start () {
  # $1 : month [integer], 0 = this_month(default), -1 = last_month, 1 = next_month, etc...
  date -d "@$(month_start_epoch $1)"
}
function month_end () {
  # $1 : month [integer], 0 = this_month(default), -1 = last_month, 1 = next_month, etc...
  date -d "@$(month_end_epoch $1)"
}
echo "Last month : $(month -1)"
echo "Last month start : $(month_start -1)"
echo "Last month end : $(month_end -1)"
echo "This month : $(month)"
echo "This month start : $(month_start)"
echo "This month end : $(month_end)"
echo "Next month : $(month 1)"
echo "Next month start : $(month_start 1)"
echo "Next month end : $(month_end 1)"
echo ""

# YEAR
function year_epoch () {
  # $1 : year [integer], 0 = this_year(default), -1 = last_year, 1 = next_year, etc...
  YEAR=$1
  [ -z "$YEAR" ] && YEAR=0
  date +%s -d "$YEAR year"
}
function year_start_epoch () {
  # $1 : year [integer], 0 = this_year(default), -1 = last_year, 1 = next_year, etc...
  YEAR=$1
  [ -z "$YEAR" ] && YEAR=0
  date +%s -d "$YEAR year Jan 1 00:00:00"
}
function year_end_epoch () {
  # $1 : year [integer], 0 = this_year(default), -1 = last_year, 1 = next_year, etc...
  YEAR=$1
  [ -z "$YEAR" ] && YEAR=0
  date +%s -d "$YEAR year Dec 31 23:59:59"
}
function year () {
  # $1 : year [integer], 0 = this_year(default), -1 = last_year, 1 = next_year, etc...
  date -d "@$(year_epoch $1)"
}
function year_start () {
  # $1 : year [integer], 0 = this_year(default), -1 = last_year, 1 = next_year, etc...
  date -d "@$(year_start_epoch $1)"
}
function year_end () {
  # $1 : year [integer], 0 = this_year(default), -1 = last_year, 1 = next_year, etc...
  date -d "@$(year_end_epoch $1)"
}
echo "Last year : $(year -1)"
echo "Last year start : $(year_start -1)"
echo "Last year end : $(year_end -1)"
echo "This year : $(year)"
echo "This year start : $(year_start)"
echo "This year end : $(year_end)"
echo "Next year : $(year 1)"
echo "Next year start : $(year_start 1)"
echo "Next year end : $(year_end 1)"