pdd - Man Page

Tiny date, time difference calculator with timers.

pdd (python3 date diff) is a small utility to calculate date and time difference. It can also be used as a timer. If no program arguments are specified it shows the current date, time and timezone.

Features

- easy to use, minimal dependencies
- calculate date and time difference
- add, subtract duration (timeslice) to/from date (time)
- calculate diff from today and now
- countdown timer with command piggybacking
- custom resolution stopwatch
- non-verbose mode for background timers
- show current date, time and timezone
- follows ISO 8601

Operational notes

- ISO 8601 format. Month can be specified as month number (e.g. Jan - 1, Dec - 12).
- Time is in 24-hr format.
- The absolute difference is shown. Argument order is ignored.
- The end date is excluded in date difference calculations.
- Hour, minute or second can be omitted. Partial inputs are recognized as mm:ss or ss.
- The keybind to stop timers is Ctrl-C.

Options

-h, --help: Show help text and exit.
-d, --date yyyy mmm dd [yyyy mmm dd | y m d]: Calculate date difference.
-t, --time hh:mm:ss [hh:mm:ss | h:m:s]: Calculate time difference.
--add: Add a duration or timeslice to date (/today) or time (/now).
--sub: Subtract a duration or timeslice from date (/today) or time (/now).
--day yyyy mmm dd: Show the day of the week on a date.
-c, --timer hh:mm:ss: Set a countdown timer with duration in hours, minutes and seconds.
-r, --run command: Run command when countdown timer reaches 0.
-s, --stopwatch [resolution]: Start a custom resolution stopwatch. resolution can range from 1 to 9. Default 3 for millisecond.
-q, --quiet: Quiet mode for a countdown timer or stopwatch to be run in the background. The counter is shown only when Ctrl-C is pressed.

Examples

Calculate diff from today:
```
$ pdd 2014 Jan 15
```
Calculate diff from now:
```
$ pdd 24:00:00
$ pdd 0
```
Calculate date diff:
```
$ pdd -d 1983 jul 3 2014 1 15
```
Calculate time diff:
```
$ pdd -t 45:50 6:17:33
```
Show current date, time and timezone:
```
$ pdd
```
Specify time with roll-over:
```
$ pdd -t 5:80:75 6:17:33
```
Add a duration (3 years, 2 months, 1 day) to 28 Feb, 2000:
```
$ pdd -d 2000 FEB 28 3 2 1 --add
```
Add a timeslice (1 hour 2 mins 3 secs) to 23:45:37:
```
$ pdd -t 23:45:37 1:2:3 --add
```
Add a duration (3 years, 2 months, 1 day) to today:
```
$ pdd 3 2 1 --add
```
Add a timeslice (1 hour 2 minutes 3 seconds) to now:
```
$ pdd 1:2:3 --add
```
Subtract a duration (1 day) from 1 Mar, 2000:
```
$ pdd -d 2000 Mar 01 0 0 1 --sub
```
Subtract a timeslice (1 sec) from midnight:
```
$ pdd -t 00:00:00 0:0:1 --sub
```
Subtract a duration (3 years, 2 months, 1 day) from today:
```
$ pdd 3 2 1 --sub
```
Subtract a timeslice (1 hour 2 minutes 3 seconds) from now:
```
$ pdd 1:2:3 --sub
```
Show the day of the week on 15 Jan 2014:
```
$ pdd --day 2014 Jan 15
```
Start a countdown timer or stopwatch in quiet mode in the background:
```
$ pdd -qs &
$ pdd -qc 3:0:0 &
```
To see the final counter run fg and press Ctrl-C.

Run a command when countdown timer reaches 0:

$ pdd -c 00:00:5 -r 'ps -aux'
$ pdd -c 00:00:5 -r 'notify-send pdd expired'

pdd - Man Page

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