Creates the chronology era object from the numeric value.
!(p)
The era is, conceptually, the largest division of the time-line.
Most calendar systems have a single epoch dividing the time-line into two eras.
However, some have multiple eras, such as one for the reign of each leader.
The exact meaning is determined by the chronology according to the following constraints.
!(p)
The era _in use at 1970-01-01 must have the value 1.
Later eras must have sequentially higher values.
Earlier eras must have sequentially lower values.
Each chronology must refer to an enum or similar singleton to provide the era values.
!(p)
This method returns the singleton era of the correct type for the specified era value.
@param eraValue the era value
@return the calendar system era, not null
@throws DateTimeException if unable to create the era
Creates the chronology era object from the numeric value. !(p) The era is, conceptually, the largest division of the time-line. Most calendar systems have a single epoch dividing the time-line into two eras. However, some have multiple eras, such as one for the reign of each leader. The exact meaning is determined by the chronology according to the following constraints. !(p) The era _in use at 1970-01-01 must have the value 1. Later eras must have sequentially higher values. Earlier eras must have sequentially lower values. Each chronology must refer to an enum or similar singleton to provide the era values. !(p) This method returns the singleton era of the correct type for the specified era value.
@param eraValue the era value @return the calendar system era, not null @throws DateTimeException if unable to create the era