pltimefmt: Set format for date / time labels

`pltimefmt`: Set format for date / time labels
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#### `pltimefmt`: Set format for date / time labels

`pltimefmt (` | fmt`)`;

Sets the format for date / time labels. To enable date / time format labels see the options to `plbox` and `plenv`.

`fmt` (`const char *`, fmt)

  This string is passed directly to the system strftime. See the system documentation for a full list of conversion specifications for your system. All conversion specifications take the form of a '%' character followed by further conversion specification character. All other text is printed as-is. Common options include:

  - `%c`: The preferred date and time representation for the current locale.

  - `%d`: The day of the month as a decimal number.

  - `%H`: The hour as a decimal number using a 24-hour clock.

  - `%j`: The day of the year as a decimal number.

  - `%m`: The month as a decimal number.

  - `%M`: The minute as a decimal number.

  - `%S`: The second as a decimal number.

  - `%y`: The year as a decimal number without a century.

  - `%Y`: The year as a decimal number including a century.

Redacted form: `pltimefmt(fmt)`

This function is used in example 29.

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