"Wed, 21 Jan 1970 15:20:35"

Convert date and time to unixtime.

1783235

Another datetime format string at UTC

YYYYMMDD
19700121

Only TIME
15:20:35

General datetime
1970-01-21 15:20:35Z

For Database
1970-01-21 15:20:35

For HTTP1.1
Wed, 21 Jan 1970 15:20:35 GMT

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