Working with calendars in the shell

Tutorial – Shell Calendars

Article from Issue 254/2022
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Command-line aficionados do not have to forgo calendars and appointment reminders. The shell offers many tools for user-friendly handling of date definitions in scripts.

Working with dates in the shell often causes problems. Aside from the usual typos, this is usually due to mismatched language and country settings. In practice, you will especially be confronted with this when working with databases.

Manual input can be relatively easily checked for formal correctness. The simplest aspect to change is the separators or the order of day, month, and year. An example of this is shown in Listing 1, and the corresponding output is shown in Figure 1. The short script supports both correct input with the dot as a separator and input with the comma in the numeric keypad for quick data entry.

Figure 1: Using a script to convert a date format. Date formats are defined by standards such as DIN 5008 (for Germany) [1] and ISO 8601 (international) [2].

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