schedule parameter is very flexible, but must take one of the following
forms to be interpreted correctly:
YYYY-MM-DD HH:MM:SSin 24-hour UTC time)
"in 5 minutes"where intervals supported are
"5 days from now"or
crontab-compatible specification like
0 * * * *(every hour at 0 on the hour) or
0 0 * * *(every day at midnight). This also includes directives like
"every 3 hours"or
"every day at 1am"
In all cases times are UTC.