The date of execution has been assigned between 1231 and 1250.

The date of an overall composition cannot be assigned to any one year.

A date of 1543 has been assigned to this.

But at the start we were all assigned dates and lessons to teach, with participation by other students.

No certain dates can be assigned to the emperor's life or reign.

Is there a date assigned for a first draft, revisions?

No absolute dates within a certainty better than a century can be assigned to this period.

It is not possible to assign definite dates or authors to most of these works.

Traditional Christian scholarship has generally preferred to assign earlier dates.

For the first time in history, dates could be assigned to Southwestern ruins with certainty.