There are at least six different week numbering systems currently in use around the world.
The most common is the International Standard ISO 8601, where Monday is the first day of the week followed by Tuesday, Wednesday, Thursday, Friday, Saturday and with Sunday as the seventh and final day. Using ISO 8601 can help any confusion when communicating internationally.
When using Odd or Even week watering, the normal watering is permitted to start at this time only on these weeks. We use the ISO 8601 definition of a week starting on a Monday.
