JS 时间转换

function formatDate(date, format) {
format = format + "";
var result = "";
var i_format = 0;
var c = "";
var token = "";
var y = date.getYear() + "";
var M = date.getMonth() + 1;
var d = date.getDate();
var E = date.getDay();
var H = date.getHours();
var m = date.getMinutes();
var s = date.getSeconds();
var yyyy, yy, MMM, MM, dd, hh, h, mm, ss, ampm, HH, H, KK, K, kk, k;
var value = {};

if (y.length < 4) {
y = "" + (y - 0 + 1900);
}
value["y"] = "" + y;
value["yyyy"] = y;
value["yy"] = y.substring(2, 4);
value["M"] = M;
value["MM"] = LZ(M);
value["MMM"] = MONTH_NAMES[M - 1];
value["NNN"] = MONTH_NAMES[M + 11];
value["d"] = d;
value["dd"] = LZ(d);
value["E"] = DAY_NAMES[E + 7];
value["EE"] = DAY_NAMES[E];
value["H"] = H;
value["HH"] = LZ(H);

if (H == 0) {
value["h"] = 12;
} else if (H > 12) {
value["h"] = H - 12;
} else {
value["h"] = H;
}

value["hh"] = LZ(value["h"]);
if (H > 11) {
value["K"] = H - 12;
} else {
value["K"] = H;
}

value["k"] = H + 1;
value["KK"] = LZ(value["K"]);
value["kk"] = LZ(value["k"]);
if (H > 11) {
value["a"] = "PM";
} else {
value["a"] = "AM";
}

value["m"] = m;
value["mm"] = LZ(m);
value["s"] = s;
value["ss"] = LZ(s);

while (i_format < format.length) {
c = format.charAt(i_format);
token = "";
while ((format.charAt(i_format) == c) && (i_format < format.length)) {
token += format.charAt(i_format++);
}
if (value[token] != null) {
result = result + value[token];
} else {
result = result + token;
}
}
return result;
}