Convert time from 12-hours and 24-hours formats

[Mag]

I'm working in a project where I need both 12-hours and 24-hours time. Is there a quick way to convert the time from and between this two time formats or I have to manually convert them?

[Klaus]

Hi Mag,

no need to do this manually, do it by script!
...
convert "10:00 PM" from time to system time
answer it
## 22:00
...



Best

Klaus

[bn]

Hi Mag,

also have a look at "twelveHourTime" in the dictionary, also mentioned in the dictionary entry "time"

Code: Select all

on mouseUp
   set the twelveHourTime to not the twelveHourTime
   put the time into field 1
end mouseUp

this will toggle the displayed time from 12 to 24 hours and back each time you click the button

Kind regards
Bernd

[Mag]

convert "10:00 PM" from time to system time
answer it
## 22:00

Thank you Klaus, and if the system time is already in 12-hours format? (I don't know this value)

[Klaus]

Can you check if your time contains AM or PM and take appropriate action in that case?

[Mag]

Thank you, very interesting. Anyway I have to use both, 12 and 24 time in the same stack. The user enter the time, and with a checkbox it has to see the value in 12 or 24 at any time. This is because I'm searching a way to convert it.

Code: Select all

function convertFrom12to24 myTime

    return my24Time
end convertFrom12to24


function convertFrom24to12 myTime

    return my12Time
end convertFrom24to12

[Mag]

Can you check if your time contains AM or PM and take appropriate action in that case?

I Klaus, I do know if the time I need to convert is in 12 or 24 format.

[Klaus]

Quick and dirty:

Code: Select all

function convertFrom12to24 myTime
   put (myTime contains "PM") into isPM
   replace " AM" with empty in myTIme
   replace " PM" with empty in myTime  
   
   set itemdel to ":"
   if isPM then
      add 12 to item 1 of myTime
   end if
   return myTime
end convertFrom12to24

Might need some more details, but is a start.
I'll leave the other function up to you!

[Mag]

OK, here is the resulting functions.

Thank you to all helped me!

Some aspects to keep in mind when make this kind of time conversion:
1. In the 24-hours time, there is not the hour 24, maximum time is 23:59.
2. In the 24-hours time, there is the 00 hour which corresponds to 12 AM.
3. The 12 PM, in 12-hours times, corresponds to 12:00 in 24-hours time.

The functions are not localizes, so they expects to find "AM" and "PM" strings. Also they convert only the hour and AM/PM notation, not the whole time. Anyway, it's easy to implement minutes and seconds if needed (they don't change in conversion).

Code: Select all

function from24to12 tHour -- tHour is the passed hour, for example 14
   if tHour = "0" then
      put "12" into tHour
      put "AM" into tAMorPM
   else if tHour = "12" then
      put "PM" into tAMorPM
   else if tHour > "12" then
      subtract 12 from tHour
      put "PM" into tAMorPM
   else if tHour < "12" then
      put "AM" into tAMorPM -- the hour remains the same
   end if
   end if
   
   return tHour && tAMorPM -- e.g. "2 PM"
end from24to12

Code: Select all

function from12to24 tHour tAMorPM -- e.g 2 PM
   if tAMorPM = "AM" then
      if tHour = "12" then
         put "00" into tHour
      end if
   else if tAMorPM = "PM" then
      if tHour <> "12" then
         add "12" to tHour
      else if tHour = "12" then
         put "12" into tHour
      end if
   end if
   
   return tHour -- e.g 14
end from12to24