"Thu, 01 Jan 1970 21:47:20"

Convert date and time to unixtime.

78440

Another datetime format string at UTC

YYYYMMDD
19700101

Only TIME
21:47:20

General datetime
1970-01-01 21:47:20Z

For Database
1970-01-01 21:47:20

For HTTP1.1
Thu, 01 Jan 1970 21:47:20 GMT


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