datetime - Converting date/time and generating offsets in bash script -


i need script date/time conversion. should take input particular time. should generates series of offsets, in both hour:minute form , number of milliseconds elapsed.

for 03:00, example, should give 04:02:07 (3727000ms*) 05:04:14 (7454000ms), 06:06:21 etc...

how go doing bash script? ideally work on both mac os x , linux (ubuntu or debian).

  • (1hr * 60 minutes/hr *60 seconds/minute *1000ms/sec )+(2min*60 sec/min * 1000ms/sec)+(7sec*1000ms/sec) = (60*60*1000)+(2*60*1000)+(7*1000) = 3727000

time2ms () {     local time=$1 hour minute second     hour=${time%%:*}     minute=${time#$hour:}     minute=${minute%:*}     second=${time#$hour:$minute}     second=${second/:}     echo "$(( ( (10#${hour} * 60 * 60) + (10#${minute} * 60) + 10#${second} ) * 1000 ))" }  ms2time () {     local ms=$1 hour minute second     ((second = ms / 1000 % 60))     ((minute = ms / 1000 / 60 % 60))     ((hour = ms / 1000 / 60 / 60))     printf '%02d:%02d:%02d\n' "$hour" "${minute}" "${second}" }  show_offsets () {     local time=$1 interval=$2 time_ms interval_ms new_time     time_ms=$(time2ms "$time")     interval_ms=$(time2ms "$interval")     new_time=$(ms2time $((time_ms + interval_ms)) )     echo "$new_time (${interval_ms}ms)" }

demos:

$ show_offsets 03:00 1:02:07 04:02:07 (3727000ms) $ show_offsets 03:00 2:04:14 05:04:14 (7454000ms) $ show_offsets 03:00 3:06:21 06:06:21 (11181000ms)

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