Twelve months of exactly thirty days each received new names derived from nature.

It is a simplification to a 360-day year, consisting of 12 months of 30 days each.

Assume one begins at a particular new month of 29 days.

Similar situations can be contrived with other months of fewer than 31 days.

Twelve months of 30 days were named for festivals or activities of the pastoral year.

Also, every six years the Sumerian calendar included an extra month of 62 days.

However, the traditional Zoroastrian calendar had 12 months of 30 days each.

For example, in a climate model the statistics may be simplified by having 12 months of 30 days.

For about a month of twenty days, he rains.

It is the law that the president may delay this entire process by as long as one month of twenty-eight days.