CODEWITHSUNDEEP
bashdatetime
Suxsem
Suxsem

Reputation: 292

date and time from epoch in seconds WITH timezone and daylight saving

I'm trying to get the current date/time seconds from epoch in bash. I did it with

date +%s

But this doesn't handle my timezone and daylight saving.

Something like 1) get epoch 2) add 3600 (i'm in rome, so GMT+1) 3) add 3600 only if we are on daylight saving time

It's possible in bash?

Upvotes: 1

Views: 1536

Answers (2)

Suxsem
Suxsem

Reputation: 292

I found a way:

#!/bin/sh
OFFSET=$(date +%z)
SIGN=${OFFSET:0:1}
HOURS=${OFFSET:1:2}
MINUTES=${OFFSET:3:2}
EPOCH=$(date +%s)
echo $(( ${EPOCH} ${SIGN} ( ${HOURS} * 3600 + ${MINUTES} * 60 ) ))

Upvotes: 1

flederwiesel
flederwiesel

Reputation: 461

date [-u|--utc|--universal] returns the UTC representation whereas date returns the system's local time with regard to DST (Daylight Saving Time).

Example (assuming 2016-06-01 is within DST):

Get Local time from your timezone (GMT+1 +1 for DST)

$ date -d '2016-06-01 02:00:00+0200' +'%s = %Y-%m-%d %H:%M:%S'
1464739200 = 2016-06-01 02:00:00

Get UTC (epoch) from your timezone (GMT+1 +1 for DST)

$ date -u -d '2016-06-01 02:00:00+0200' +'%s = %Y-%m-%d %H:%M:%S'
1464739200 = 2016-06-01 00:00:00

Upvotes: 0

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