diff --git a/src/opts.js b/src/opts.js
index 84349e5e..dedadbf3 100644
--- a/src/opts.js
+++ b/src/opts.js
@@ -58,23 +58,24 @@ export const wholeIncrs = oneIncrs.filter(onlyWhole);
 
 export const numIncrs = decIncrs.concat(oneIncrs);
 
-const NL = "\n";
+export const NL = "\n";
 
-const yyyy    = "{YYYY}";
-const NLyyyy  = NL + yyyy;
-const md      = "{M}/{D}";
-const NLmd    = NL + md;
-const NLmdyy  = NLmd + "/{YY}";
+const _ = null;
 
-const aa      = "{aa}";
-const hmm     = "{h}:{mm}";
-const hmmaa   = hmm + aa;
-const NLhmmaa = NL + hmmaa;
-const ss      = ":{ss}";
+export function genTimeStuffs(ms, opts) {
+	opts = opts || {};
+	const yyyy    = opts.YYYY || "{YYYY}";
+	const NLyyyy  = opts.NLyyyy || NL + yyyy;
+	const md      = opts.md || "{M}/{D}";
+	const NLmd    = opts.NLmd || NL + md;
+	const NLmdyy  = opts.NLmdyy || NLmd + "/{YY}";
 
-const _ = null;
+	const aa      = opts.aa || "{aa}";
+	const hmm     = opts.hmm || "{h}:{mm}";
+	const hmmaa   = opts.hmmaa || hmm + aa;
+	const NLhmmaa = opts.NLhmmaa || NL + hmmaa;
+	const ss      = opts.ss || ":{ss}";
 
-function genTimeStuffs(ms) {
 	let	s  = ms * 1e3,
 		m  = s  * 60,
 		h  = m  * 60,
@@ -243,9 +244,6 @@ function genTimeStuffs(ms) {
 	];
 }
 
-export const [ timeIncrsMs, _timeAxisStampsMs, timeAxisSplitsMs ] = FEAT_TIME && genTimeStuffs(1);
-export const [ timeIncrsS,  _timeAxisStampsS,  timeAxisSplitsS  ] = FEAT_TIME && genTimeStuffs(1e-3);
-
 // base 2
 const binIncrs = genIncrs(2, -53, 53, [1]);
 
@@ -700,4 +698,4 @@ export const xScaleOpts = {
 export const yScaleOpts = assign({}, xScaleOpts, {
 	time: false,
 	ori: 1,
-});
\ No newline at end of file
+});
diff --git a/src/uPlot.js b/src/uPlot.js
index 75c74e8d..b2e4aa1d 100644
--- a/src/uPlot.js
+++ b/src/uPlot.js
@@ -135,9 +135,6 @@ import {
 
 	clampScale,
 
-	timeIncrsMs,
-	timeIncrsS,
-
 	wholeIncrs,
 	numIncrs,
 	timeAxisVal,
@@ -152,21 +149,17 @@ import {
 	timeSeriesLabel,
 	numSeriesLabel,
 
-	timeAxisSplitsMs,
-	timeAxisSplitsS,
-
 	numAxisSplits,
 	logAxisSplits,
 	asinhAxisSplits,
 
 	timeAxisStamps,
 
-	_timeAxisStampsMs,
-	_timeAxisStampsS,
-
 	timeSeriesStamp,
 	_timeSeriesStamp,
 
+	genTimeStuffs,
+
 	legendOpts,
 } from './opts';
 
@@ -460,6 +453,9 @@ export default function uPlot(opts, data, then) {
 	const _tzDate  = FEAT_TIME && (opts.tzDate || (ts => new Date(round(ts / ms))));
 	const _fmtDate = FEAT_TIME && (opts.fmtDate || fmtDate);
 
+	const [ timeIncrsMs, _timeAxisStampsMs, timeAxisSplitsMs ] = FEAT_TIME && genTimeStuffs(1, opts.timeFormats);
+	const [ timeIncrsS,  _timeAxisStampsS,  timeAxisSplitsS  ] = FEAT_TIME && genTimeStuffs(1e-3, opts.timeFormats);
+
 	const _timeAxisSplits = FEAT_TIME && (ms == 1 ? timeAxisSplitsMs(_tzDate) : timeAxisSplitsS(_tzDate));
 	const _timeAxisVals   = FEAT_TIME && timeAxisVals(_tzDate, timeAxisStamps((ms == 1 ? _timeAxisStampsMs : _timeAxisStampsS), _fmtDate));
 	const _timeSeriesVal  = FEAT_TIME && timeSeriesVal(_tzDate, timeSeriesStamp(_timeSeriesStamp, _fmtDate));