#!/bin/bash

OLD="2006-12-10 12:00"
NEW="2006-12-10 13:00"

TIME="$(((`date +%s -d "${NEW}"` - `date +%s -d "${OLD}"`)))" #SHOW SEC
echo "$TIME secs"
# if over 48 houers show as days
if [[ "$(($TIME / 60 / 60 ))" -ge "48" ]]
	then 
		#show Days
		SPLIT=$(bc << EOF
		scale=1
		($TIME / 60 / 60 / 24) 
		EOF
		)
		echo "$SPLIT Day(s) between old and new dato"

# if under 2 days.. show as houers
elif [[ "$(($TIME /60))" -ge "60" ]] && [[ "$(($TIME / 60/ 60))" -le "48" ]]
	then 
		#show Houers
		SPLIT=$(bc << EOF
		scale = 2
		($TIME / 60 / 60)
		EOF
		)	
		echo "$SPLIT Houer(s) between old and new dato"

# if less than 1 houer show as minutes
elif [[ "$(($TIME /60))" -lt "60" ]]
	then 
		#show minutes
		SPLIT=$(bc << EOF
		scale=1
		($TIME / 60)
		EOF
		)
		echo "$SPLIT Minute(s) between old and new Dato"
fi


####################################

OUTPUT WITH SET-X

###################################

+ OLD='2006-12-10 12:00'
+ NEW='2006-12-10 13:00'
++ date +%s -d '2006-12-10 13:00'
++ date +%s -d '2006-12-10 12:00'
+ TIME=3600
+ echo '3600 secs'
3600 secs
+ [[ 1 -ge 48 ]]
+ [[ 60 -ge 60 ]]
+ [[ 1 -le 48 ]]
++ bc
(standard_in) 3: illegal character: O              
(standard_in) 3: parse error
+ SPLIT=1.00
+ echo '1.00 Houer(s) between old and new dato'
1.00 Houer(s) between old and new dato



###########################################
without set-x
############################################
3600 secs
(standard_in) 3: illegal character: O
(standard_in) 3: parse error
1.00 Houer(s) between old and new dato