Light Novel Timeline

Volume 1 - The Undead King
Earliest Possible Date: Late 6th Month 2Xth Day based on Evileye's statement minus 8 days?

Starts: Moment of Transfer (Late 6th Month, Early 7th Month)

Nazarick is hidden by hills: 3rd Night After Transfer

Carne Village Saved: 73 hours after transfer

Ends: Before 8th Day after Transfer

Snooping on the Guardians Season 1 Anime Drama CD
Starts: After Volume 1

Ends: Before Volume 2

Volume 2 - The Dark Warrior
Earliest Possible Date: 7th Month 4th Day based on Evileye's statement?

Starts: 8th Day After Transfer

Momon becomes an Adventurer less than two months before 9th Month, 3rd day.

Darkness teams with Swords of Darkness: 9th Day After Transfer

Battle in the Graveyard: 11th Night After Transfer

Ends: 12th Day After Transfer

Volume 3 - The Bloody Valkyrie
Starts: 11th Night After Transfer

Ainz's PoV: 12th Day After Transfer

Ends: 12th Day After Transfer

Epilogue: During Volume 4

Evil Tree Drama CD
8th Month?

Starts: A month after Shalltear was saved

Ends: One day later and before Volume 4

Volume 4 - The Lizard Man Heroes
Season: Summer

Starts: At least two weeks after Evil Tree? 8 Days before Iguvua attacks.

Lizardmen Tribes Meet Together: Four days before Iguvua attacks.

Lizardmen Meet Ainz: One day after battle with Iguvua

VS Cocytous: Several Days After Iguvua's battle

Ends:

Search For Hamusuke S1 Drama CD
Start: After Volume 4

Ends: Before Volume 8

Volume 8 - The Two Leaders
8th Month?

Before Autumn: Starts: After Volume 4

Ends: Before Men in the Kingdom Part 2 (9th Month 3rd Night).

Harvest happens in Autumn AFTER Volume 8.

Volume 5 - The Men in the Kingdom Part 1
Summer

Starts: 8th Month 26th Day

Ends: 9th Month 3rd Night

Volume 6 - The Men in the Kingdom Part 2
Starts: 9th Month 3rd Night

Ends: 9th Month 10th Day

Volume 7 - The Invaders of the Large Tomb
10th Month

Season: Autumn Harvest Season

Starts: Prologue is right after Volume 6

Ainz goes to Empire: At least one month after Volume 6

Ainz goes to market during first two days:

Ainz leaves Empire 7 days later:

Takes 4 days to reach Nazarick from Empire:

Ends:

Volume 9 - The Magic Caster of Destroy
Starts: Right after Volume 7 Epilogue

Jircniv Visits Nazarick 5 days after Volume 7 Epilogue:

Season Winter:

Kingdom gets letter from Empire:

Kingdom gathers in E-Rantel: 2 months later

Ends: First day of Spring

Volume 10 - The Ruler of Conspiracy
Starts: One Month After Volume 9 Brand New Chapter

Ends:

Volume 12 - The Paladin of the Holy Kingdom Part 1
Season: Chapter 1 Autumn

Season:Chapter 2 onwards Winter

Volume 13 - The Paladin of the Holy Kingdom Part 2
Season: Chapter 4 Winter

End: Spring?