When was Barack Obama president of the us?

For what periods of time was Barack Hussein Obama II (born August 4, 1961), the 44th and current President of the United States the president (head of a nation state) of The United States of America (also called the United States, the States, the U.S., the USA, and America), the federal constitutional republic, a union of fifty states, which also has territories and a federal district among its lands?

Facts Show facts

Show reasoning Reasoning

I followed this chain of reasoning:

I know from locally stored knowledge that:
Fact 1: Barack Obama is the president of the United States ([fact: ["148101818@trueknowledge.com"]])

Fact 1 is true for January 20th 2009, 17:01 onwards ([fact: ["163567798@trueknowledge.com"]])

By calculation (generator: ["first_parameter@trueknowledge.com"]) I know that:
January 20th 2009, 17:01 is the first parameter of January 20th 2009, 17:01 onwards

By calculation (generator: ["second_parameter@trueknowledge.com"]) I know that:
indefinitely after is the second parameter of January 20th 2009, 17:01 onwards

By calculation (generator: ["in_group@trueknowledge.com"]) I know that:
indefinitely after is in the group indefinitely after and the end of time

I know from locally stored knowledge that:
Fact 3: Barack Obama is not the president of the United States ([fact: ["148101826@trueknowledge.com"]])

Fact 3 is true for the beginning of time - January 20th 2009, 17:01 ([fact: ["163567802@trueknowledge.com"]])

By calculation (generator: ["first_parameter@trueknowledge.com"]) I know that:
the beginning of time is the first parameter of the beginning of time - January 20th 2009, 17:01

By calculation (generator: ["second_parameter@trueknowledge.com"]) I know that:
January 20th 2009, 17:01 is the second parameter of the beginning of time - January 20th 2009, 17:01

By calculation (generator: ["strictequal1@trueknowledge.com"]) I know that:
January 20th 2009, 17:01 is strictly equal to January 20th 2009, 17:01

January 20th 2009, 17:01 onwards is strictly equal to January 20th 2009, 17:01 onwards

By calculation (generator: ["completetimeperiod3@trueknowledge.com"]) I know that:
the fact 148101818@trueknowledge.com is true for the complete timeperiod January 20th 2009, 17:01 onwards

I used the following facts to provide this answer:

Barack Obama has been the president of the United States since January 20th 2009, 17:01

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Barack Obama has not been the president of the United States until January 20th 2009, 17:01

agree disagree edit