Shows how ms-since-epoch TS that are truncated to fit in int32_t space will look.

moment_to_datetime.py

from subprocess import check_output
from datetime import datetime
ms_since_epoch = check_output([
  "node",
  "-e",
  "console.log(require('moment')().valueOf())"
])
dt = datetime.fromtimestamp(float(ms_since_epoch) / 1000.0)
print(ms_since_epoch)
print(dt)
ts = ms_since_epoch[:10]
dt = datetime.fromtimestamp(int(ts))
print(ts)
print(dt)                                                                                                                                       
ts = ms_since_epoch[-11:]
dt = datetime.fromtimestamp(int(ts))
print(ts)
print(dt)

# python main.py
1567213448944

2019-08-30 21:04:08.944000
1567213448
2019-08-30 21:04:08
7213448944

2198-08-01 18:49:04