"Sat, 31 Jan 1970 00:19:40"

Convert date and time to unixtime.

2593180

Another datetime format string at UTC

YYYYMMDD
19700131

Only TIME
00:19:40

General datetime
1970-01-31 00:19:40Z

For Database
1970-01-31 00:19:40

For HTTP1.1
Sat, 31 Jan 1970 00:19:40 GMT

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