"Wed, 18 Mar 1970 00:53:20"

Convert date and time to unixtime.

6569600

Another datetime format string at UTC

YYYYMMDD
19700318

Only TIME
00:53:20

General datetime
1970-03-18 00:53:20Z

For Database
1970-03-18 00:53:20

For HTTP1.1
Wed, 18 Mar 1970 00:53:20 GMT

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