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from datetime import datetime
string_date = "2022-01-01 12:34:56"
format_string = "%Y-%m-%d %H:%M:%S"
timestamp = datetime.strptime(string_date, format_string)
print(timestamp)
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String sdatetime = "2021-12-04";
DateTime sdate = DateTime.parse(sdatetime);
int stimestamp = sdate.microsecondsSinceEpoch;
print(stimestamp); //output: 1638555300000000