Astrodate vs Julian Clock
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Astrodate
This app provides the current date and time in multiple specialized formats, including Julian Date, Modified Julian Date, and Truncated Julian Date. It also offers standard Gregorian ISO 8601 formats, eliminating the need for manual calculations. Ideal for astronomers and those requiring precise timekeeping across various systems.
- Julian Date conversion
- Modified Julian Date
- Truncated Julian Date
- Dublin Julian Date
- Gregorian ISO 8601 format
- Astronomical date calculations
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Astrodate provides the current date and time in Julian Date, Modified Julian Date, Truncated Julian Date, and Dublin Julian Date as well as normal Gregorian ISO 8601 numeric date time formats. This is particularly useful for astronomers and others who need these various date formats, and don't want to do the calculations.
Julian Clock
This utility app displays the current Julian Date, time with seconds, military date format, day of the week, and Zulu time (GMT). It's designed for quick access to essential timekeeping information.
- Julian Date display
- Real-time clock with seconds
- Military date format
- Day of the week
- ZULU time (GMT)
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It's as simple as it gets, a Julian date and clock app built for people who need the numbers fast. Julian Clock shows everything you need at a glance: • Julian date (YJJJ or YYDDD, your choice in Settings) • Local time with running seconds • Date in military format (e.g. 19JUN26) • Day of the week • Zulu time (GMT) New in version 2 • Home Screen widgets — small and medium layouts with Julian date, Zulu, and military date • Lock Screen widgets — circular, rectangular, and inline at-a-glance views • Apple Watch app — Julian date and Zulu on your wrist, plus complications • iPad support — universal layout for desk and EFB use • Historical lookup — pick any date on the calendar to get its Julian day • Eight themes — Navy, Air Force, Army, Marines, Coast Guard, Space Force, Dark, and Light Widgets and the Watch app stay in sync with your format and theme choices. This app is for military and DOD personnel who constantly need a quick look at the Julian date and/or Zulu time, on the phone, on the lock screen, on the watch, or on an iPad beside the job.
Screenshots
Verdict
The clearest difference is rating: Julian Clock at 4.9 against Astrodate's 1.0. Julian Clock also leads on ratings volume (15 vs 1) and chart position (#173 vs unranked). Astrodate's advantage is update cadence (every 12 months vs every 69 months). On price, ads, in-app purchases and monetization model there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Astrodate costs $0.99 and Julian Clock $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Julian Clock holds the better App Store score, 4.9 against 1.0. That said, the two scores are not equally well evidenced: Julian Clock has 15 ratings behind it against 1, so its average is the more settled of the two.
Astrodate ships an update every 12 months, Julian Clock every 69 months. The most recent releases landed on September 10, 2026 and September 21, 2026 respectively.
| Parameter | Astrodate | Julian Clock |
|---|---|---|
| Price | $0.99 | $0.99 |
| Rating | 1.0 (1 ratings) | 4.9 (15 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | 1 | 15 — better |
| Update frequency | Every 12 months — better | Every 69 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Best chart rank | — | #173 — better |
| Devices | iPhone, iPad | iPhone, iPad, Apple Watch — better |
| Requires iOS | 18.0 | 17.0 — better |
| Further details — not scored | ||
| Size | 1 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | Flying Titans, Inc. | Adam Allard |
Customer experience
Astrodate
Julian Clock
In-app purchases
Astrodate
No in-app purchases
Julian Clock
No in-app purchases
