Creation in 6 days
It is mentioned in Quran that this universe was created in six days or six periods. This is mentioned in 7 different verses and also explained in details in three other verses.
your guardian-lord is Allah, who created the heavens and the earth in six days, and is firmly established on the throne.
he who created the heavens and the earth and all that is between, in six days, and is firmly established on the throne (of authority): Allah most gracious: ask thou, then, about him of any acquainted (with such things).
He it is who created the heavens and the earth in six days, and is moreover firmly established on the throne (of authority). he knows what enters within the earth and what comes forth out of it, what comes down from heaven and what mounts up to it. and he is with you where so ever ye may be. and Allah sees well all that ye do.
he it is who created the heavens and the earth in six days - and his throne was over the waters - that he might try you, which of you is best in conduct. but if thou wert to say to them, "ye shall indeed be raised up after death", the unbelievers would be sure to say, "this is nothing but obvious sorcery!"
It is Allah who has created the heavens and the earth, and all between them, in six days, and is firmly established on the throne (of authority): ye have none, besides him, to protect or intercede (for you): will ye not then receive admonition?
verily your lord is Allah, who created the heavens and the earth in six days, and is firmly established on the throne (of authority), regulating and governing all things. no intercessor (can plead with him) except after his leave (hath been obtained). this is Allah your lord; him therefore serve ye: will ye not receive admonition?
created the heavens and the earth and all between them in six days,
nor did any sense of weariness touch us.
Following verse, explain these six periods:
say: is it that ye deny him who created the earth in two days? and do ye join equals with him? he is the lord of (all) the worlds.
he set on the (earth), mountains standing firm, high above it, and bestowed blessings on the earth, and measure therein all things to give them nourishment in due proportion, in four days, in accordance with (the needs of) those who seek (sustenance).
he completed them as seven firmaments in two days, and he assigned
to each heaven its duty and command. and we adorned the lower heaven
with lights, and (provided it) with guard. such is the decree of
(him) the exalted in might, full of knowledge.
Based on above three verses, some argues that the duration of creation was eight periods and therefore there is a contradiction in Quran. This is clearly not the case here because in the four days mentioned above, also is include the creation of earth in the first two days. Therefore in summary, based on Quranic verses, God created the earth and this world in the two days. In the next two days, the world was prepared for evolving the life. Afterward, skies and spiritual world were created in the last two days.