"Sun, 22 Feb 1970 18:15:59"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700222
Only TIME
18:15:59
General datetime
1970-02-22 18:15:59Z
For Database
1970-02-22 18:15:59
For HTTP1.1
Sun, 22 Feb 1970 18:15:59 GMT