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Os.date "isdst" issue.

 
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ByTransient
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PostPosted: Tue Dec 15, 2020 10:38 am    Post subject: Os.date "isdst" issue. Reply with quote
Os.date "isdst" issue.
The code below adds the country time difference automatically. Or I think so.
I have to subtract 3 hours each time.
I have to disassemble the current time zone, reassemble it and format it.
But when I collect it again, I see an extra 3 hours added.


Code:
local dh,dm,ds=os.date("%H"), os.date("%M"), os.date("%S")
print("Available: "..dh..":"..dm..":"..ds)

local xxx5,xxx6,xxx7=3600*dh, 60*dm, ds*1
local xxx8=xxx5+xxx6+xxx7 --3*3600
print(os.date("Formatted: %X", xxx8))



Is there a solution about this?
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ParkourPenguin
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PostPosted: Tue Dec 15, 2020 12:22 pm    Post subject: Reply with quote
You're completely ignoring other information pertinent to specifying a point in time. In Lua's case, you also need the year, month, and day.

This is how you add 3 hours to a time correctly in Lua:
Code:
local d = os.date'*t'
d.hour = d.hour + 3
local t = os.time(d)
print(os.date("Formatted: %X", t))
For more information, RTFM.
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ByTransient
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PostPosted: Tue Dec 15, 2020 2:10 pm    Post subject: Reply with quote
This answer partially answers my question.
I didn't try to add 3 hours, my code in the question itself adds 3 hours.
But your answer partially enlightened me. Thank you.

If you have an idea; How can I print the difference between the manually inserted time and the current time?

Example;
Expected time: 19:50:00
Current time: 19:40:39
Time left: 0:09:21

The above output is the result I reached with a lot of unnecessary code.
But is there a shorter way to find it?
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ParkourPenguin
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PostPosted: Tue Dec 15, 2020 4:55 pm    Post subject: This post has 1 review(s) Reply with quote
os.date only formats time points. AFAIK there's nothing in the standard library to format time intervals, so you'll have to do that yourself:
Code:
function format_seconds(sec)
  if sec < 0 then return '00:00:00' end
  return ('%02d:%02d:%02d'):format(sec // (60*60), (sec // 60) % 60, sec % 60)
end

Use os.difftime to get the number of seconds left.
Code:
local start = os.date'*t'
local finish = {}

for k,v in pairs(start) do finish[k] = v end
finish.min = finish.min + 10

local starttime = os.time(start)
local finishtime = os.time(finish)

function status()
  print(os.date('Start time:  %X', starttime))
  print(os.date('Finish time: %X', finishtime))
  print('Remaining:   ' .. format_seconds(os.difftime(finishtime, os.time())))
end

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ByTransient
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PostPosted: Tue Dec 15, 2020 6:02 pm    Post subject: Reply with quote
Thank you.
You always have a different and effective style.
+1 for your help and patience, thank you again.
Here is the result of the code I have made inexperienced;
"format_seconds" was the code I was looking for.

Code:
if f then f.destroy() end

f=createForm(true)
f.Position=poDesktopCenter
f.Width=220 f.Height=105

local l1=createLabel(f) l1.AutoSize=false
l1.Height=25 l1.Width=200 l1.Left=10 l1.Top=10
l1.Font.Size=12 l1.Font.Style="fsBold" l1.Alignment="taCenter"

local l2=createLabel(f) l2.AutoSize=false
l2.Height=25 l2.Width=200 l2.Left=10 l2.Top=40
l2.Font.Size=12 l2.Font.Style="fsBold" l2.Alignment="taCenter"

local l3=createLabel(f) l3.AutoSize=false
l3.Height=25 l3.Width=200 l3.Left=10 l3.Top=70
l3.Font.Size=12 l3.Font.Style="fsBold" l3.Alignment="taCenter"

---------------------- function -------------------
function format_seconds(sec)
  if sec < 0 then return '00:00:00' end
  return ('%02d:%02d:%02d'):format(sec // (60*60), (sec // 60) % 60, sec % 60)
end

local d1 = os.date'*t'
local xx=1
local x = ({"h02m52s00", "h02m54s00", "h02m56s00"})
local prt3=""
if secTimer then secTimer.destroy() end
secTimer=createTimer() secTimer.Interval=1000 secTimer.Enabled=true

secTimer.OnTimer=function()
if prt3==("Remaining:     00:00:00") then
xx=xx + 1 end
if xx==4 then secTimer.Enabled=false l3.caption="Execute time: Finish!"
else
local xh,xm,xs=string.match(x[xx], "h(.*)m(.*)s(.*)")
--print("\nxx: "..xx)
local xxx1,xxx2,xxx3=3600*xh, 60*xm, xs*1
local xxx4=xxx1+xxx2+xxx3

l1.caption=("Execute time:   "..xh..":"..xm..":"..xs)

local dh,dm,ds=os.date("%H"), os.date("%M"), os.date("%S")

local xxx5,xxx6,xxx7=3600*dh, 60*dm, ds*1
local xxx8=xxx5+xxx6+xxx7
xxx9=xxx4-xxx8--3*3600
xxx8 = os.time(d1)
l2.caption=(os.date("Current time:   %H:%M:%S"))

prt3=('Remaining:     '..format_seconds(xxx9))
l3.caption=(prt3)
end
end
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