Population Projection Description This publication presents the results and the methodological aspects used in the preparation of the Population Prospejection of Brazil and of the Federation Units by IBGE. The population estimates now released incorporate the demographic parameters based on the 2010 Population Census and the latest information from administrative records of births and deaths. These estimates are of fundamental importance for the calculation of socio-demographic indicators, as well as for feeding the information bases of Ministries and State Departments from a number of different areas for the implementation of public policies and the subsequent evaluation of their respective programs. Furthermore, municipal population estimates derive from population projections, which together constitute the main parameter for the distribution of the shares relative to the State and Municipal Revenue Sharing Fund, carried out by the Brazilian Court of Audit. The following innovations stood out: correction of the age structure of the base population; population projections of the Federation Units through the method of demographic components, and population projections by five-year age groups up to 90 years or more of age. Source: https://www.ibge.gov.br/en/np-statistics/social/population/18176-population-... If the "normally" parameter used to define which city will serve as a reference for the time zone within the operating system is that of the most populous city, I ask: Why are there only seven locations randomly registered between cities and states, that exists even more than one city of the same state (state of Pará for example) among the seven currently registered, since Brazil has 27 states and 5570 municipalities and what, at least should be registered is the federal capital, whose name is Brasilia, reference for more than two hundred million Brazilians as official time? The attached images serve to illustrate the above subject. ________________________________ De: Paul Eggert <eggert@cs.ucla.edu> Enviado: sexta-feira, 1 de março de 2019 15:48 Para: ricardotiellet Cc: Time Zone Mailing List Assunto: Re: [tz] [IANA #1136519] America / Sao_Paulo in the Time Zone Database

On 2019-03-05 02:49, rhiccarddo rcd wrote:

If the "normally" parameter used to define which city will serve as a reference for the time zone within the operating system is that of the most populous city, I ask: Why are there only seven locations randomly registered between cities and states, that exists even more than one city of the same state (state of Pará for example) among the seven currently registered, since Brazil has 27 states and 5570 municipalities and what, at least should be registered is the federal capital, whose name is Brasilia, reference for more than two hundred million Brazilians as official time?

The most populous city in a time zone whose clocks have agreed since 1970 may now also be in a different country, and once a city has been designated, is unlikely to be changed, unless there are changes in the history of the clocks; see: https://data.iana.org/time-zones/theory.html

The attached images serve to illustrate the above subject.

Those images are of user interfaces provided by some software suppliers. Please refer any issues with those interface displays to those software suppliers: that is their interface decision. Time zones provide a technical means of supporting time zones and maintaining the underlying information. Some suppliers use their own time zone sources and data, notably MS Windows OS, not that available at IANA, and some suppliers modify the IANA information for greater compatibility with their app and user bases. -- Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada This email may be disturbing to some readers as it contains too much technical detail. Reader discretion is advised.