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Public Time API vs TimeZones iCal Library

Same instrument, two spec sheets — measured, not claimed.

APIPublic Time APINEW—TimeZones iCal LibraryNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Public Time API vs TimeZones iCal Library: common questions

Which is more reliable, Public Time API or TimeZones iCal Library?

On our scheduled checks, TimeZones iCal Library leads on measured uptime — Public Time API at —% versus TimeZones iCal Library at —% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Do Public Time API and TimeZones iCal Library need an API key?

Neither needs a paid key — Public Time API is callable with no signup, and TimeZones iCal Library is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call Public Time API and TimeZones iCal Library from the browser?

Only TimeZones iCal Library is browser-friendly — it returns CORS headers over HTTPS. Public Time API needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are Public Time API and TimeZones iCal Library free for commercial use?

Public Time API has unclear commercial terms, and TimeZones iCal Library has unclear commercial terms. We track service terms and the data license as separate fields — see the Commercial use and Data license rows above, and confirm both before shipping either in a paid product.