Argthtjtr

I know about http://www.timeanddate.com/worldclock/converter.html

I can't figure out how to query http://www.google.com in a sane natural format like "5pm BST in PST".

Or do I have to write such an app?

It's 6pm in Taipei, what time is it here?

date --date='TZ="Asia/Taipei" 18:00'

Fri Jul 16 11:00:00 BST 2010

At 11am here in London, what time is it in Taipei?

TZ=Asia/Taipei date -d "11:00 BST"

Fri Jul 16 18:00:00 CST 2010

This example is from http://www.pixelbeat.org/cmdline.html#dates

It gives the local time corresponding to 9AM on the west coast of the US,
accounting for differing day light savings transitions.

date --date='TZ="America/Los_Angeles" 09:00 next Fri'

Use tzselect to get the TZ. The PST format is ambiguous.
IST = Indian Standard Time and Irish Summer Time for example.

I think this is closer to what the OP asked (Since he doesn't necessarily know that BST is Taipei? and the answer doesn't explain how to get to "Asia/Taipei" from 'BST').

First my current date:

$ date

Mon Apr 21 13:07:21 MDT 2014

Then the date I want to know:

$ date -d '5pm BST'

Mon Apr 21 15:00:00 MDT 2014

So I know that 5pm BST is 2 hours away.

I usually forget if I have to add or remove two hours from EDT times so I have a little script with the common timezones I have to work with:

$ cat tz

#!/bin/bash

TZ='America/Edmonton' date

TZ='America/Chicago' date

TZ='America/New_York' date

And the output:

$ tz

Mon Apr 21 13:12:32 MDT 2014

Mon Apr 21 14:12:32 CDT 2014

Mon Apr 21 15:12:32 EDT 2014

Valid locations for your tz script can be found here /usr/share/zoneinfo.

But again, for times in the future I just use date -d '<time> <timezone>'.

Use Wolfram Alpha. To the basic URL…

http://www.wolframalpha.com/input/?i=

append the conversion, with spaces replaced by +. For example:

http://www.wolframalpha.com/input/?i=5+PM+CET+to+PST

Note that Wolfram Alpha does not seem to recognize BST as a time zone.

I know it is an old thread, but I needed a code for the same use case and, based on the ideas here, developed this little bash script:

#!/bin/bash

# ig20180122 - displays meeting options in other time zones

# set the following variable to the start and end of your working day

myday="8 20" # start and end time, with one space

# set the local TZ

myplace='America/Sao_Paulo'

# set the most common places

place[1]='America/Toronto'

place[2]='America/Chicago' # Houston as well

place[3]='Europe/Amsterdam'

place[4]='Europe/Dublin'

# add cities using place[5], etc.

# set the date format for search

dfmt="%m-%d" # date format for meeting date

hfmt="+%B %e, %Y" # date format for the header

# no need to change onwards

format1="%-10s " # Increase if your cities are large

format2="%02d "

mdate=$1

if [[ "$1" == "" ]]; then mdate=`date "+$dfmt"`; fi

date -j -f "$dfmt" "$hfmt" "$mdate"

here=`TZ=$myplace date -j -f "$dfmt" +%z  "$mdate"`

here=$((`printf "%g" $here` / 100))

printf "$format1" "Here" 

printf "$format2" `seq $myday` 

printf "n"

for i in `seq 1 "${#place[*]}"`

do

    there=`TZ=${place[$i]} date -j -f "$dfmt" +%z  "$mdate"`

    there=$((`printf "%g" $there` / 100))

    city[$i]=${place[$i]/*//}

    tdiff[$i]=$(($there - $here))

    printf "$format1" ${city[$i]}

    for j in `seq $myday`

    do

        printf "$format2" $(($j+${tdiff[$i]}))

    done

    printf "(%+d)n" ${tdiff[$i]}

done

You can either use to check the time differences today or in a future date:

16:08 $ meet

January 22, 2019

Here       08 09 10 11 12 13 14 15 16 17 18 19 20 

Toronto    05 06 07 08 09 10 11 12 13 14 15 16 17 (-3)

Chicago    04 05 06 07 08 09 10 11 12 13 14 15 16 (-4)

Amsterdam  11 12 13 14 15 16 17 18 19 20 21 22 23 (+3)

Dublin     10 11 12 13 14 15 16 17 18 19 20 21 22 (+2)

16:13 $ meet 05-24

May 24, 2019

Here       08 09 10 11 12 13 14 15 16 17 18 19 20 

Toronto    07 08 09 10 11 12 13 14 15 16 17 18 19 (-1)

Chicago    06 07 08 09 10 11 12 13 14 15 16 17 18 (-2)

Amsterdam  13 14 15 16 17 18 19 20 21 22 23 24 25 (+5)

Dublin     12 13 14 15 16 17 18 19 20 21 22 23 24 (+4)

16:13 $ 

HTH