Cron-expressies ontcijferen
* * * * *
*/5 * * * *
*/15 * * * *
0 * * * *
0 */2 * * *
0 0 * * *
0 9 * * *
0 9 * * 1-5
0 0 * * 0
0 0 1 * *
0 0 1 1 *