"Sun, 25 Jan 1970 21:42:54"

Convert date and time to unixtime.

2151774

Another datetime format string at UTC

YYYYMMDD
19700125

Only TIME
21:42:54

General datetime
1970-01-25 21:42:54Z

For Database
1970-01-25 21:42:54

For HTTP1.1
Sun, 25 Jan 1970 21:42:54 GMT

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