Questions tagged [time-date]

is for time of day, handling date and time formats, interfacing with the operating system for date and time values, converting time zones, and calculating date and time arithmetic.

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22
votes
2answers
1k views

Is there a mode to automatically update copyright years in files?

Usually around this time of year people start to realize that their copyright year is out of date in their files. This is particularly annoying if you like to put the copyright in every source file. I ...
14
votes
2answers
2k views

Specify timezone in Org date format

When I write something like this: <2015-07-05 Sun 20:00 GMT+0>, and then try to edit it by pressing C-c ., Org removes the GMT+0 part. So, I think it's in a wrong format. Note: I don't want to ...
12
votes
2answers
2k views

Parsing formatted time string (inverse of format-time-string)

The format-time-string function takes a time argument like '(21761 64499 350937 0) and a format string like "%y-%m-%d %a %H:%M" and returns something like "15-03-12 Thu 16:49". What is the inverse ...
9
votes
2answers
1k views

Counting the number of days that have passed since a certain date

I have an org-mode document in which I wish to keep track of the number of days that have passed since a certain date. Is there a built in function for this, or will I be forced to write a custom ...
9
votes
3answers
5k views

in org-mode, how to insert timestamp with today's date?

In a Lisp function, how do I instruct org to automatically insert a timestamp with today's date? I found the function org-insert-time-stamp, but I don't know how to provide an argument for it that ...
8
votes
2answers
1k views

How can I change Org-mode time format for one buffer?

In general all timestamps in Org-mode appears as [YYYY-MM-DD Day]. I have one file (buffer) where I would like the format to be different. Either just [YYYY-MM-DD] or [YYYY-MM]. How do I tell Org-mode ...
8
votes
2answers
458 views

Increment days / months / dates, etc. within buffer

In a text document, while editing, I often need to increment/ decrement calendar data. So, Friday will need to become Monday, December will need to become March, etc. Or 28 Apr after adding 5 will ...
7
votes
2answers
1k views

Elisp function to see a date for next Wednesday

Admitting up front that I am not capable of much Lisp, I have found ways to produce the current date or a number of seconds from a date, but I am looking for a simple equivalent to shell command like ...
7
votes
2answers
2k views

Multiple Scheduled Timestamps for One Task

Suppose I want to be reminded to water my plants on Monday, Wednesday, and Friday, AND on any of the following days, if for some reason I miss the scheduled days. I originally tried the following: **...
6
votes
2answers
1k views

How to insert inactive [timestamp] via function?

C-u C-c ! generates a time stamp like [2015-05-04 Mon 17:13] I would like to assign a shortcut (e.g F1) to this action. So far I have: (defun my/timenow (&optional arg) (interactive) (let (...
6
votes
4answers
519 views

Insert an arbitrary timestamp

C-c . could insert the timestamp of the current date and C-u C-c . insert the current datetime. I find it very difficult to insert an arbitrary datetime. Operations over Calendar are invalid since ...
6
votes
2answers
1k views

Show time in different time zones

I take a lot of different MOOC and each class declare own deadline relative to some time zone. Are there any Emacs mode that show date/time in buffer for several selected time zones in same time? I ...
5
votes
1answer
801 views

Change date from active to inactive

I want to change an active date <2017-12-10 17:04> to inactive date [2017-12-10 17:04] and vice versa. How do I do that?
5
votes
1answer
116 views

Display relative dates in org-mode property drawers

In org-mode documents, I very often add drawer properties to hyperlinks. To illustrate, here is an example with various data attached to a GitHub repository link: * https://github.com/caddyserver/...
4
votes
2answers
1k views

Converting plain text to dates

Is it possible to convert plain text dates to Org dates automatically? I have entries in the format: 16 February 2015 which I would like to convert to Org dates: <2015-02-16 Mon>
4
votes
2answers
1k views

Convert Unix time to Org-mode timestamp

How can I convert a Unix time to an Org-mode local timestamp? For example (convert 1523473110) should return <2018-04-11 Wed 15:58:30>. I found org-timestamp--to-internal-time, but that uses "...
4
votes
2answers
4k views

How to display time in seconds in the mode line?

By default display-time-mode shows the time only in minutes. How I can display time in seconds? Something like 18:34:45".
4
votes
1answer
249 views

How to subtract time values formatted as "HH:mm"?

I want to subtract time values like 12:04 from 11:30 and get 34 minutes or 0:34. I tried to achieve this using calculations like (time-subtract (parse-time-string "12:04") (parse-time-...
4
votes
1answer
214 views

How do I interconvert Calc's HMS forms and seconds?

Is there a built-in way to convert/toggle between GNU Emacs Calc's HMS forms and seconds? I'd also like to easily be able to add numbers as seconds and/or minutes to an existing HMS form.
4
votes
3answers
697 views

Get time in AM/PM format

(format-time-string "%p") is empty in my Emacs. How I can format date in AM/PM format? That answer second part of Show time in different time zones UPDATE (length (format-time-string "%p")) ; is 0 ...
4
votes
2answers
424 views

How to set schedule and deadline for entires being inserted via org-capture template file?

I'm trying to leverage the power of org capture templates. There are a few tasks I know I will be scheduling on particular dates of the month. Setting their schedule and deadline in the capture ...
4
votes
1answer
537 views

Display months/days or timestamps in another language than English

Setup: GUI version GNU Emacs 25.0.50.1 (x86_64-w64-mingw32) of 2015-07-25 on KAEL compiled from EmacsW64. Windows 7 x64 Dutch version. Situation: When I'm evaluating the following snippet: (...
4
votes
2answers
163 views

Easily update dates for a recurrent set of TODOs in org mode

Every semester I teach the same course and for every semester there are several TODOs that should, at least initially, have the same dates relative to the starting date (i.e. the first day of class). ...
3
votes
2answers
459 views

The time of the last change of the current buffer

Can Emacs determine the time of the last change (or the last edit) done to the current buffer? The buffer may has been saved or not.
3
votes
2answers
201 views

Apply different function to each element in list?

I have a time-stamp of a video formatted as "00:00:00,000" such that "%H:%M:%s,%3N". I am want to eventually use this timestamp as part of an in-interval-p function where I take two timestamps and a ...
3
votes
1answer
604 views

org column view with date calculations

* TODO fix this bug asap :PROPERTIES: :UPDATE: writing test cases almost there! :LASTUPDATED: 2019-11-25 :DEADLINE: 2019-11-30 :END: * TODO update that documentation :PROPERTIES: :UPDATE: updating my ...
3
votes
2answers
165 views

Check whether a string is a date in a specific format, e.g. "%Y-%m-%d"

I have a string and would like to check whether it contains a date in a given date format, e.g. "%Y-%m-%d", with format as for format-time-string. This is for a package and users can configure the ...
3
votes
2answers
430 views

Convert between ISO week and a normal date

How can you convert between ISO year-week-day and an elisp date that can be sent to, e.g., format-time-string? I do not want to go via a string representation. I found the following old question on ...
3
votes
2answers
2k views

Show sum of efforts for a day in Org-Agenda day title

I would like to show sum of efforts for all tasks for a day in Org-Agenda day title. E.g. for a week agenda there would be 7 sums for each of the day, in their respective titles. I think this could ...
3
votes
1answer
81 views

Column of programmatically updated dates in org-mode

I'm trying to make a table in org-mode, the first column of which should be the Monday of each week starting with a date I specify. So, for example, if I specify Dec 14th, I would get a column with ...
3
votes
1answer
849 views

Compare file modification time stamps

Background I am using Emacsclient to open files in a Emacs server. The server configuration depends on the content of a JSON configuration file. A Perl script can read the config file and write a ...
3
votes
1answer
164 views

Can Ibuffer show buffers last viewing time?

I was wondering if it is possible to have a column in Ibuffer that shows the last viewing time. In the default view I can see these columns: MR Name Size Mode Filename/...
3
votes
0answers
281 views

How to get the (localized) day of the week lowercased in time-stamp-format?

The %:a allows to get the full weekday in the Time-stamp. My system-time-locale is fr_FR.UTF-8. I am using the Time-stamp in a Markdown file, inside a pandoc title block, which I export to html, so I ...
2
votes
2answers
739 views

Table formula for dates delta

Here my org table: | | Start date | End date | State | Duration | |---+------------------------+------------------------+-------+----------| | # | <2019-01-02 Wed 10:...
2
votes
2answers
231 views

Inserting timestamp in mini buffer in Emacs

I keep on saving various org files in their respective folders using Filename as YYYY-MM-DD.org files . So I ended up typing C-x C-w 2020-10-06.org at least thirty times today. Can this process be ...
2
votes
1answer
179 views

Is it possible to change and freeze the current date-time in Emacs?

I'm a heavy Emacs Org-mode user and VERY dependent on the date functionality. I frequently enter events, receipts, etc. using capture templates after they've already occurred. My current solution is ...
2
votes
2answers
855 views

Yasnippet invoked org-time-stamp function inserts double timestamp

I created a yasnippet template to quickly timestamp a note I'd like to make in org-mode. The body of the yasnippet file reads $0 :PROPERTIES: :CREATED: `(org-insert-time-stamp nil t t)` :END: ...
2
votes
1answer
933 views

in yasnippet, how to insert variable date with fixed time of day?

I want a yasnippet to insert an org-mode date and time. The date should be today's date, but the time should be fixed. So far my snippet correctly inserts today's date, but not the time: # -*- ...
2
votes
1answer
227 views

How to add a time and a time interval in calc-mode?

How do I use calc to add a time interval to a moment in time (i.e., a date, or a time)? For instance, say I want to know what the time and day will be 8,000 minutes into the future? I know that t N ...
2
votes
1answer
91 views

Automatically update a date in tangled files of an .org file?

I'm in the process of writing a LaTeX class using org-babel for the literate programming. In several places of the file .org file, I have to insert the release date of this class, at least in the ...
2
votes
1answer
232 views

Customising the increments in an org-mode timestamp

When I create an appointment in org-agenda I make use of timestamps. The item is created with today's date and time and I then place my cursor on the date and time respectively and use S-up or S-down ...
2
votes
1answer
161 views

How to retrieve the date under the cursor in emacs calendar as the format day.month.year like 15.07.2018

Is there a way to retrieve the date under the cursor in emacs calendar as the format day.month.year like 05.07.2018 as a clipboard content?
2
votes
1answer
494 views

org-mode timestamp repeater interval manipulation

What are (if any) the lisp functions to read and write the repeater interval part of the org-mode timestamps? (The ones at the end of the timestamp string, which are optional, e.g. +1w or +6d in <...
2
votes
1answer
26 views

date to time for french

I want to convert a lot of french dates in date to time (date-to-time "june 7 2021 12:00:00" ) => (24765 60960) (date-to-time "7 juin 2021 12:00:00" ) => Debugger entered--...
2
votes
1answer
118 views

Hide org-table rows outside certain date ranges?

Excel tables lets us show just the rows that have "July 2018" in a specific column, and hide the rest. Or to show "21st August 2017-30th August 2017, and also July 2018, and also all of 2019", and ...
2
votes
1answer
360 views

Is there a view that can show time entered per day?

Basically I am after a method to find missing times. Currently I use this code to view times per task. #+BEGIN: clocktable :link t :maxlevel 10 :block week :scope file But I can not view if i am ...
2
votes
1answer
2k views

Current time timestamp in org-capture-templates

In org-mode org-capture templates, what is the way to insert current time timestamp? I've tried %U like so: (setq org-capture-templates (quote ( ("k" "Capture an item and schedule it for ...
2
votes
1answer
345 views

Determining the string formats for datetime-timezone

When loading a .log file I get the message Warning (emacs): Failed to determine system timezone; consider customizing ‘datetime-timezone’ variable Going to the customization menu, the options are ...
2
votes
1answer
209 views

What is the reason for this erratic behavior in `time-subtract`?

I am attempting to calculate some time differences in org time strings using time-subtract. (time-subtract (org-parse-time-string "2018-04-16 Mon 14:00") (org-parse-time-string "2018-...
2
votes
1answer
77 views

Query org agenda build time?

Q: how can I get the last time I built the org agenda buffer? I've set an idle timer to rebuild my org agenda buffer every x minutes. It works fine, but it's inefficient to rebuild if the agenda ...