Convert ESRI datetime (ms since 1970-01-01) to POSIXct
| 1 | to_POSIXct(x, origin = "1970-01-01 00:00.00 UTC", fact = 1000)
 | 
| x | the input numeric ESRI timestamp | 
| origin | character - epoch origin as string | 
| fact | numeric scaling factor to convert from ms to s | 
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