First of all, a warning: Deep dive into Belobog's timeline will hit several self-contradictions, as many fans had found out when they were trying to figure out Serval's and Pela's age. Just warning you ahead of time.
But, let's try calculating it anyways. There's actually a couple of dates given for more recent events, listed when you search for Natasha's, Serval's, and Pela's Resumes. For example, from Natasha's Resume:
In 6█3 AF, graduated from Belobog College of Medicine and entered the Belobog Charice Hospital as a resident. In 6█4 AF, joined Belobog Scientific Expeditionary Team as a team physician. In 6█5 AF, entered the Silvermane Guard Field Hospital as a member of the emergency medical team in the Logistics Department. In 6█6 AF, after completing the required residency, returned to Belobog Underworld and opened an orphanage in Rivet Town. In 6█4 AF, opened a clinic in Boulder Town in the Belobog Underworld and assisted Wildfire in maintaining stability and providing medical care.
Another confirmed date is the second item in the list: 684, the year Pela was born and her mother passed away during that expedition. Assuming then that Pela is 16 years old as some sources state, that means the "current" year the Astral Express arrived on Belobog is exactly 700 by local calendar.
Now, the question is, what is year 0 on their local calendar system? It couldn't be the day the antimatter legion attacked, as that wouldn't sync up with The Battle of Shuhu 721 years ago. My guess is that is probably the year when the Stellaron was invoked, which is 30 years after the invasion from the Antimatter Legion started. This would make the invasion start 730 years ago, which is 7370 SC by Xianzhou calendar.
So there is a 9 year window in there for Igor to go off doing his fighting tournament rounds. Since Xianzhou was his last stop and there were others before him, then the earliest he could've been attending the wardance was probably 7371 SC.
Hm, going by this then, Jing Yuan would've been not yet fully grown around a few years before the Battle of Shuhu. But how old is that by Xianzhou standards / growth rate we don't know either. I mean, Qingque claims she still has room to grow and she's ~200. So... he could just have had a late growth spurt. *handwaves*
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But, let's try calculating it anyways. There's actually a couple of dates given for more recent events, listed when you search for Natasha's, Serval's, and Pela's Resumes. For example, from Natasha's Resume:
In 6█3 AF, graduated from Belobog College of Medicine and entered the Belobog Charice Hospital as a resident.
In 6█4 AF, joined Belobog Scientific Expeditionary Team as a team physician.
In 6█5 AF, entered the Silvermane Guard Field Hospital as a member of the emergency medical team in the Logistics Department.
In 6█6 AF, after completing the required residency, returned to Belobog Underworld and opened an orphanage in Rivet Town.
In 6█4 AF, opened a clinic in Boulder Town in the Belobog Underworld and assisted Wildfire in maintaining stability and providing medical care.
Of these years, the last item is confirmed to be 694, see Notice: Additional Barricades on the Main Road of the Plaza and Notice Under Bridge.
Another confirmed date is the second item in the list: 684, the year Pela was born and her mother passed away during that expedition. Assuming then that Pela is 16 years old as some sources state, that means the "current" year the Astral Express arrived on Belobog is exactly 700 by local calendar.
Now, the question is, what is year 0 on their local calendar system? It couldn't be the day the antimatter legion attacked, as that wouldn't sync up with The Battle of Shuhu 721 years ago. My guess is that is probably the year when the Stellaron was invoked, which is 30 years after the invasion from the Antimatter Legion started. This would make the invasion start 730 years ago, which is 7370 SC by Xianzhou calendar.
So there is a 9 year window in there for Igor to go off doing his fighting tournament rounds. Since Xianzhou was his last stop and there were others before him, then the earliest he could've been attending the wardance was probably 7371 SC.
Hm, going by this then, Jing Yuan would've been not yet fully grown around a few years before the Battle of Shuhu. But how old is that by Xianzhou standards / growth rate we don't know either. I mean, Qingque claims she still has room to grow and she's ~200. So... he could just have had a late growth spurt. *handwaves*