Reference : Hisn al-Muslim 89

أَصْبَـحْـنا وَأَصْبَـحْ المُـلكُ للهِ رَبِّ العـالَمـين ، اللّهُـمَّ إِنِّـي أسْـأَلُـكَ خَـيْرَ هـذا الـيَوْم ،
فَـتْحَهُ ، وَنَصْـرَهُ ، وَنـورَهُ وَبَـرَكَتَـهُ ، وَهُـداهُ ،
وَأَعـوذُ بِـكَ مِـنْ شَـرِّ ما فـيهِ وَشَـرِّ ما بَعْـدَه 
وإذا أمسى قال: 
أَمْسَيْـنا وَأَمْسـى المُـلكُ للهِ رَبِّ العـالَمـين ،
اللّهُـمَّ إِنِّـي أسْـأَلُـكَ خَـيْرَ هـذهِ اللَّـيْلَة ،
فَتْحَهـا ، وَنَصْـرَهـا ، وَنـورَهـا وَبَـرَكَتَـهـا ، وَهُـداهـا ،
وَأَعـوذُ بِـكَ مِـنْ شَـرِّ ما فـيهـاِ وَشَـرِّ ما بَعْـدَهـا
Aṣbaḥnā wa aṣbaḥal-mulku lillāhi Rabbi ‘l-a`lāmīn, 
Allāhumma innī as'aluka khayra hādha ‘l-yawm: 
Fat’ḥahu wa naṣrahu wa nūrahu, 
wa barakatahu, wa hudāh, 
wa a`ūdhu bika min sharri mā fīhi 
wa sharri mā ba`dah.


We have entered a new day and with it all the dominion which belongs to Allah, Lord of all that exists. 
O Allah, I ask You for the goodness of this day,2 
its victory, its help, its light, 
its blessings, and its guidance.
I seek refuge in You from the evil that is in it,
and from the evil that follows it.

Reference:
1 For evening recitation, say here: Allāhumma innī as'aluka khayra 
hāthihil-laylah: "My Lord, I ask You for the good things of this night."
2 Abu Dawud 4/322. Its transmission chain is good (Hasan). See also Ibn 
Al-Qayyim, Zadul- Ma'ad 2/273.

Chapter: In the morning and evening