@dgt41
Let's try again. Why would it work fine when using the popup and not when entering manually?

This is not an issue with the persian calendar - it is an issue with the entire calendar - see #17171

It may be specific to Jalali as the issue concerns the correct persian date.
@farhadst
Please test.
#17183

My test with #17183 looks like it does not solve the jalali issue. Not using the popup but directly editing the field may add a number of days depending on the month.

@infograf768 ok I am doing something stupid there, I try to parse the date but the date is not an object but rather a simple array of numbers :(

This should fix the Jalali calendar (around line 1014

							// We need to transform the date for the data-alt-value
							var mdate = new Date(), ndate, date = Date.parseFieldDate(calObj.inputField.value, calObj.params.dateFormat, calObj.params.dateType);
							ndate = Date.localCalToGregorian(date.getFullYear(), date.getMonth(), date.getDate());
							mdate.setFullYear(ndate[0]);
							mdate.setDate(ndate[2]);
							mdate.setMonth(ndate[1]);
							calObj.inputField.setAttribute('data-alt-value', mdate.print(calObj.params.dateFormat, 'gregorian', false));

Let me know if this solves the problem

@dgt41
It does!.

Therefore combining #17183 and your proposal would solve the issue for me.

@infograf768 @dgt41
sorry but this change code in media/system/js/fields/calendar.js Has no effect on the problem (manually set persian date)

@farhadst strange, did you also applied #17183?

PS. I think there is a small bug in the above snippet, there shouldn't be a new mdate variable, as that will reset the time to now, this should be the correct one:

// We need to transform the date for the data-alt-value
							var ndate, date = Date.parseFieldDate(calObj.inputField.value, calObj.params.dateFormat, calObj.params.dateType);
							ndate = Date.localCalToGregorian(date.getFullYear(), date.getMonth(), date.getDate());
							date.setFullYear(ndate[0]);
							date.setDate(ndate[2]);
							date.setMonth(ndate[1]);
							calObj.inputField.setAttribute('data-alt-value', date.print(calObj.params.dateFormat, 'gregorian', false));

But again this also requires #17183

@farhadst
When patching calendar.js, please do not forget to set DEBUG on.

@infograf768 yes debug is on
@dgt41 in media/system/js/fields/calendar.js line 1013 to 1026 is:

if (calObj.params.dateType !== 'gregorian') {
							// We need to transform the date for the data-alt-value
							var ndate, date = Date.parseFieldDate(calObj.inputField.value, calObj.params.dateFormat, calObj.params.dateType);
							ndate = Date.localCalToGregorian(date.getFullYear(), date.getMonth(), date.getDate());
							date.setFullYear(ndate[0]);
							date.setDate(ndate[2]);
							date.setMonth(ndate[1]);
							calObj.inputField.setAttribute('data-alt-value', date.print(calObj.params.dateFormat, 'gregorian', false));
						} else {
									calObj.inputField.setAttribute('data-local-value', Date.parseFieldDate(calObj.inputField.value, calObj.params.dateFormat, calObj.params.dateType)
									.print(calObj.params.dateFormat, 'gregorian', false));
									calObj.inputField.setAttribute('data-alt-value', Date.parseFieldDate(calObj.inputField.value, calObj.params.dateFormat, calObj.params.dateType)
									.print(calObj.params.dateFormat, 'gregorian', false));
						}

but Has no effect on the problem

@farhadst can you please test this code:
(replace the 4th line in the above code)

ndate = Date.localCalToGregorian(date.getLocalFullYear('gregorian'), date.getLocalMonth('gregorian'), date.getLocalDate('gregorian'));

@dgt41 i replace code but no effect on the problem

@farhadst can you please provide some dates to test/debug this.
What I need is the

• typed date (jalali)
• saved date (jalali)
• saved date (gregorian, eg from the db)

first date is: ۱۳۹۶-۰۳-۰۸ ۰۰:۱۱:۰۰ = 1396-03-08 00:11:00 = 2017-05-29
date from 08 change to 09 and save but one day will be reduced and date is 08
no effect typ persian number or latin number

@farhadst excellent, thank you. That will make it way easier to debug. One more thing you mentioned that the date can also be reduced by one day, can you provide the same set of data as before for such a behaviour?

@dgt41 i check again and behaviour is the like befor:

If one of the January days is chosen according to Jalali, one day will be added to set date,
for example if set 1396-10-26 (16January) and save it, date change to 1396-10-27

any date In February, 1 day is added to the selected date

any date In March, 2 days from the chosen date will be reduced
for example if set 1396-12-24 (15March) and save it, date change to 1396-12-22

any date In April, no day can be chosen and if set any date, this change to the first of may
any date In may, 1 days from the chosen date will be reduced
There is no problem in June
any date In july, 1 days from the chosen date will be reduced
There is no problem in August and September
any date In October, 1 days from the chosen date will be reduced
any date In November, 1 day is added to the selected date
There is no problem in December

An interesting point
if click on date box and then click on popup calendar, date change but if no click on date box and just click on popup calendar date no change

@farhadst

Please, look at this and post your comments there (concerns the calendar itself, not the field)

#17389

@infograf768 I check this and Yes, this problem was to persian calendar (day name incorrect)
with file replacement problem fixed and now day name is correct

@farhadst this was fixed or there is something still pending here?

@dgt41 No this issue not fixed and is still pending

@farhadst so which part is still buggy?

@dgt41 yes this part is still buggy

What exactly is not working now?

@brianteeman I gave a full explanation on this post

any Opinion @brianteeman?

The error described by @farhadst sounds unrelated to the calendar localisation and more to do with a difference in the timezone settings between the site and the server

Set to "closed" on behalf of @franz-wohlkoenig by The JTracker Application at issues.joomla.org/joomla-cms/17150

closed as stated above. Issue can always reopened.