检查目录是否存在.

Format unix time int64 to string.

Parse Date use PHP time format.

Format unix time string to string.

Format time.Time struct to string MM - month - 01 M - month - 1, single bit DD - day - 02 D - day 2 YYYY - year - 2006 YY - year - 06 HH - 24 hours - 03 H - 24 hours - 3 hh - 12 hours - 03 h - 12 hours - 3 mm - minute - 04 m - minute - 4 ss - second - 05 s - second = 5.

FirstDayOfMonth The First day of this month .

FirstDayOfWeek The week First day is Monday.

FirstDayOfYear The First day of this year: YYYY.01.01 .

生成随机字符串.

Format TimeStamp int64 to time.