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Date and time functions
Posted 12-09-2013 at 11:34 AM by druuna
Updated 01-31-2014 at 03:25 AM by druuna (Small changes to layout)
Updated 01-31-2014 at 03:25 AM by druuna (Small changes to layout)
A handful of date and time related functions that might come in handy.
- Convert a date or time string to seconds from epoch
PHP Code:
# ------------------------------------------------------------------ #
# Function : dateToSecs
# Syntax : dateToSecs "[date]"
# Convert a date or time string to seconds from epoch.
# ------------------------------------------------------------------ #
function dateToSecs() {
[[ $# -eq 0 ]] && date --utc '+%s'
[[ $# -ne 0 ]] && date --utc --date "$1" '+%s'
}
Code:
$ dateToSecs "2013-12-09 20:00" 1386619200 $ dateToSecs 2013-12-09 1386547200 $ dateToSecs 20:00 1386619200 $ dateToSecs 1386610113
- Convert seconds from epoch to a date string
PHP Code:
# ------------------------------------------------------------------ #
# Function : secsToDate
# Syntax : secsToDate <seconds>
# Convert seconds from epoch to a date string.
# ------------------------------------------------------------------ #
function secsToDate() {
date --utc --date @$1 +'%Y-%m-%d %T'
}
Code:
$ secsToDate 1386619200 2013-12-09 20:00:00
- Calculate difference in seconds between 2 dates/times
PHP Code:
# ------------------------------------------------------------------ #
# Function : secsBetweenDates
# Syntax : secsBetweenDates "<date1>" "<date2>"
# Calculate difference in seconds between 2 dates/times
# ------------------------------------------------------------------ #
function secsBetweenDates() {
dateOne=$( date --utc --date "$1" '+%s' )
dateTwo=$( date --utc --date "$2" '+%s' )
dateDiff=$(( dateOne - dateTwo ))
echo "${dateDiff/-/}"
}
Code:
$ secsBetweenDates "2013-12-09 19:00" "2013-12-09 20:00" 3600 $ secsBetweenDates 2013-12-08 2013-12-09 86400 $ secsBetweenDates 20:00 20:10 600
- Convert seconds to MM:SS or HH:MM:SS or DD HH:MM:SS
PHP Code:
# ------------------------------------------------------------------ #
# Function : secsToTime
# Syntax : secsToTime [d|h|m] [seconds]
# Convert seconds to MM:SS or HH:MM:SS or DD HH:MM:SS
# ------------------------------------------------------------------ #
function secsToTime() {
# d -> DD HH:MM:SS
[[ "$1" == "d" ]] && { (( d=${2}/86400 )) ; \
(( h=(${2}%86400)/3600 )) ; \
(( m=(${2}%3600)/60 )) ; \
(( s=${2}%60 )) ; \
printf "%02d %02d:%02d:%02d\n" $d $h $m $s ; }
# h -> HH:MM:SS
[[ "$1" == "h" ]] && { ((h=${2}/3600)) ; \
((m=(${2}%3600)/60)) ; \
((s=${2}%60)) ; \
printf "%02d:%02d:%02d\n" $h $m $s ; }
# m -> MM:SS
[[ "$1" == "m" ]] && { ((m=${2}/60)) ; \
((s=${2}%60)) ; \
printf "%02d:%02d\n" $m $s ; }
}
Code:
$ secsToTime m 678 11:18 $ secsToTime h 4278 01:11:18 $ secsToTime d 90678 01 01:11:18
- Legal date formats for all the above
PHP Code:
legal date formats # date command equivalent
HH # '+%H'
HH:MM # '+%R'
HH:MM:SS # '+%T'
YYYY-MM-DD # '+%F'
YYYY-MM-DD HH # '+%F %H'
YYYY-MM-DD HH:MM # '+%F %R'
YYYY-MM-DD HH:MM:SS # '+%F %T'
YYYY/MM/DD # '+%Y/%m/%d'
YYYY/MM/DD HH # '+%Y/%m/%d %H'
YYYY/MM/DD HH:MM # '+%Y/%m/%d %R'
YYYY/MM/DD HH:MM:SS # '+%Y/%m/%d %T'
