parse datetime number in html field This is a sample of datetime field:
1615717137369

It means 2 days ago (from 16 march, 13:24)
How can I parse the number?
P.S:
These are some examples:
16 15 89 8678037    16 March 16:15 ( 5 min ago)

16 15 89 8259356    16 March 16:08 (12 min ago)

16 15 89 791 8713   16 March 16:03 (17 min ago)
16 15 89 791 4439   16 March 16:03 (17 min ago)
16 15 89 791 0813   16 March 16:03 (17 min ago)


16 15 89 210 4036   16 March 14:20 ( 2  hr ago)


16 15 64 022 8942   13 March       (3 days ago)


16 10 43 350 1644   13 Jan         (2 month ago)
```
As Emil said, That is the number of milliseconds since the Unix epoch (1 Jan 1970 midnight UTC).