"Sun, 18 Jan 1970 19:40:40"

Convert date and time to unixtime.

1539640

Another datetime format string at UTC

YYYYMMDD
19700118

Only TIME
19:40:40

General datetime
1970-01-18 19:40:40Z

For Database
1970-01-18 19:40:40

For HTTP1.1
Sun, 18 Jan 1970 19:40:40 GMT

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