libxlsxwriter/examples/dates_and_times02.c

/*
 * Example of writing dates and times in Excel using an lxw_datetime struct
 * and date formatting.
 *
 * Copyright 2014-2025, John McNamara, jmcnamara@cpan.org
 *
 */

#include "xlsxwriter.h"

int main() {

    /* A datetime to display. */
    lxw_datetime datetime = {2013, 2, 28, 12, 0, 0.0};

    /* Create a new workbook and add a worksheet. */
    lxw_workbook  *workbook  = workbook_new("date_and_times02.xlsx");
    lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);

    /* Add a format with date formatting. */
    lxw_format    *format    = workbook_add_format(workbook);
    format_set_num_format(format, "mmm d yyyy hh:mm AM/PM");

    /* Widen the first column to make the text clearer. */
    worksheet_set_column(worksheet, 0, 0, 20, NULL);

    /* Write the datetime without formatting. */
    worksheet_write_datetime(worksheet, 0, 0, &datetime, NULL  );  // 41333.5

    /* Write the datetime with formatting. */
    worksheet_write_datetime(worksheet, 1, 0, &datetime, format);  // Feb 28 2013 12:00 PM

    return workbook_close(workbook);
}