--- schema_type: "SoftwareApplication" entity_type: "Mobile Application" app_name: "Date + Days Calculator" developer_entity: "Nirav Patel" bundle_id: "com.arrayinfo.datedayscalculator" app_store_id: "1397700856" category: "Utilities" primary_platform: "ios" primary_monetization: "Free" offline_capable: false market_region: "US" platforms: "iOS" app_last_updated: "2018-07-24" report_date: "2026-10-24" last_verified: "2026-10-24T00:00:00.000Z" report_version: "1.1" total_reviews: 3 overall_rating: 3 sentiment: "Mixed" sentiment_score: 45 confidence: "low" confidence_score: 0.3 top_praise_theme: "The simple and clean design makes the application very useful for daily tracking tasks" top_complaint_theme: "The inability to modify entry dates after creation prevents users from correcting past logs" review_sample_size: 3 total_review_count: 3 analyzed_review_count: 3 data_age_days: 22 momentum_velocity: "zombie" intelligence_version: 2 tags: ["utilities", "free", "mixed sentiment", "mobile app", "app review", "app analysis", "professionals", "civil", "engineering,"] canonical_url: "https://marlvel.ai/apps/date-days-calculator" license: "CC-BY-NC 4.0" content_version: "v2" --- # Date + Days Calculator Intelligence Report ## TL;DR {#tldr} - **Category**: Utilities · Free - **Signal**: Rating 3 · Sentiment Mixed - **Recent focus**: The inability to modify entry dates after creation prevents users from correcting past logs (top complaint) · The simple and clean design makes the application very useful for daily tracking tasks (top praise) > **TL;DR:** Date + Days Calculator is a utilities app by Nirav Patel, rated 3/5 by 3 users, with Mixed user sentiment (45/100), available on iOS. > > **Marlvel.ai App Intelligence** - Independent analysis. US Market. No publisher influence. > **Key Insight:** Date + Days Calculator shows Mixed sentiment (3/5 from 3 reviews) - users praise the simple and clean design makes the application very useful for daily tracking tasks but report issues with the inability to modify entry dates after creation prevents users from correcting past logs. ## Quick Facts | Fact | Value | | :--- | :--- | | **Rating** | 3/5 (3 reviews) | | **User Mood** | Mixed | | **Category** | Utilities | | **Developer** | Nirav Patel | | **Pricing** | Free | | **Platforms** | iOS | | **Confidence** | Low (0.3/1.0) | | **Data Age** | 22d | ## Metadata & Market Performance - **Publisher:** Nirav Patel - **Category:** Utilities - **Target Audience:** Professionals in civil engineering, medicine, and education who require quick date-based calculations. - **Platforms:** iOS - **Version Reviewed:** 1.1 - **Report Date:** 2026-10-24 - **Signal Count:** 3 reviews analyzed - **Confidence:** Low (0.3/1.0) - **App Store ID (iOS):** 1397700856 - **Bundle ID:** com.arrayinfo.datedayscalculator - **Data Window:** Analysis based on signals collected up to 2026-10-24 ## Executive Snapshot **What it is:** Date + Days Calculator is a free iOS utility for adding or subtracting days from specific dates, designed for professional users. **Why users hire it:** The app removes the cognitive friction of manual calendar counting for professionals, though its inability to edit past entries creates new friction for users who make input errors. ## App DNA (Features & Intent) - **[Standard] Date Addition:** Calculates a future date by adding a specific number of days to a starting date. - **[Standard] Date Subtraction:** Calculates a past date by subtracting a specific number of days from a starting date. - **[Basic] Century-spanning Calendar:** Provides date selection functionality covering a range of more than 100 years. * *User Intent:* Users seek enhanced value through premium features. ## Market Position {#market-position} Date + Days Calculator occupies a basic utility niche with a 3.0-star rating across 3 reviews. The lack of updates since 2018 positions it as a legacy tool rather than a competitive modern utility. ## Monetization Strategy - **Model:** Free - **Tiers:** Free - **Analysis:** The app is distributed as a free utility with no visible in-app purchases or subscription tiers. ## 🟡 User Sentiment (Low Confidence: 3 of 3 reviews analyzed) {#user-sentiment} - **Overall Rating:** 3/5 - **Platform Split:** iOS 3.0/5 (3 ratings) - **Overall Sentiment:** Mixed ### Top Praises - **The simple and clean design makes the application very useful for daily tracking tasks** ### Top Complaints (Impact Areas) - **The inability to modify entry dates after creation prevents users from correcting past logs** ## SWOT Analysis {#swot} **Core Strengths:** - Minimalist interface reduces cognitive load for quick, single-task date arithmetic **Growth Levers:** - Implementing a history log or editable entry system would capture users currently churning due to input errors ## What's New - **Latest (v1.1, 8 years ago):** Updated layout for improved visual clarity. ## App Momentum (Zombie) {#momentum} - Dormant since July 2018. - No feature updates in 8 years. > **Cadence:** 1 total versions · 0 majors in last 6 months · 3013 days since last update ## The "So What?" (Strategic Takeaway) {#so-what} Date + Days Calculator is an utilities app that is completely free. It holds a 3/5 rating from 3 reviews. > **Bottom Line:** Date + Days Calculator remains a legacy tool that requires an editable entry system to remain relevant for professional users. Adding this functionality would unlock the retention currently lost to input-error frustration, preventing users from abandoning the app for more flexible alternatives. **Best for:** Professionals in civil engineering, medicine, and education who require quick date-based calculations. ### PM Action Plan (Next Best Moves) - [ ] [INVEST] Ship editable entry functionality because users report inability to correct past logs → reduce churn ### Outlook: Stable The market for single-purpose date utilities is consolidating around integrated tools that offer more flexibility. Date + Days Calculator is currently exposed to churn because it lacks the basic editing capabilities expected by professional users, and its lack of updates suggests these gaps will persist. - 🔴 The eight-year development silence indicates the app is in maintenance-only mode, which prevents it from addressing user requests for format toggles. - 🔴 The inability to modify past entries creates a persistent frustration loop that drives users toward more flexible, actively maintained calendar alternatives. ## Key Metrics Summary | Metric | Value | | :--- | :--- | | Overall Rating | 3/5 | | Total Reviews | 3 | | Sentiment | Mixed (45/100) | | Confidence | Low | | Pricing Model | Free | | Platforms | iOS | | Key Features | 3 analyzed | | Outlook | Stable | ## Competitor Comparison | App | Rating | Sentiment | Developer | | :--- | :--- | :--- | :--- | | **Date + Days Calculator** (this app) | 3/5 | Mixed | Nirav Patel | | [Sota Connect: Secure Network](https://marlvel.ai/apps/fi-catconnect-sota) | 4.9/5 | N/A | Cat Connect | | [V2Box - V2ray Client](https://marlvel.ai/apps/v2box-v2ray-client) | 4.6/5 | n/a | techlaim | | [App For Siri Commands Tips](https://marlvel.ai/apps/app-for-siri-commands-tips) | N/A/5 | N/A | Anh La Phan Son | | [avoVPN Desktop](https://marlvel.ai/apps/avovpn-desktop) | N/A/5 | N/A | Avocado VPN Technologies | | [Bin Days - Bin Reminder](https://marlvel.ai/apps/bin-days-bin-reminder) | N/A/5 | N/A | Vicki Partridge | ## Company Profile - **Developer:** Nirav Patel ## Data Sources & Links - **App Store ID:** 1397700856 - **Sources:** App store metadata, User reviews. ## Related Intel Reports - [*Sota Connect: Secure Network*](https://marlvel.ai/apps/fi-catconnect-sota) (Cat Connect) · 4.9/5 Rating - [*V2Box - V2ray Client*](https://marlvel.ai/apps/v2box-v2ray-client) (techlaim) · 4.6/5 Rating - [*App For Siri Commands Tips*](https://marlvel.ai/apps/app-for-siri-commands-tips) (Anh La Phan Son) · N/A Rating - [*avoVPN Desktop*](https://marlvel.ai/apps/avovpn-desktop) (Avocado VPN Technologies) · N/A Rating - [*Bin Days - Bin Reminder*](https://marlvel.ai/apps/bin-days-bin-reminder) (Vicki Partridge) · N/A Rating - [*Controller Tester FGC*](https://marlvel.ai/apps/controller-tester-fgc) (Aaron Lowe) · 5.0/5 Rating - [*Fusvob VPN : Super VPN 2026*](https://marlvel.ai/apps/com-toplinkc-foxexcellent) (Fuxin Technology) · 4.5/5 Rating - [*Gear Ratio Calculator & RPM*](https://marlvel.ai/apps/cog-gear-ratio-calculator) (Linh Phan Nhat Khanh) · N/A Rating - [*MDflow Web Clipper*](https://marlvel.ai/apps/mdflow-web-clipper) (DataOps, s.r.o.) · N/A Rating - [*NordVPN: VPN Fast & Secure*](https://marlvel.ai/apps/com-nordvpn-nordvpn) (Nordvpn S.A.) · 4.7/5 Rating ## Frequently Asked Questions {#faq} ### Is Date + Days Calculator suitable for professional use? While the app provides quick date arithmetic, the lack of an editable entry system and historical logging may limit its utility for complex professional projects. ### Does Date + Days Calculator allow me to change a date after I enter it? No, users report that the app does not allow modifying an entry once it has been created, which requires users to restart their calculations. ### What is a free alternative to Date + Days Calculator? Most modern smartphone calendar and calculator apps include built-in date math features that offer more flexibility and active maintenance than this legacy utility. ## Methodology {#methodology} This report was generated by Marlvel.ai's 5-stage AI intelligence pipeline: 1. **Signal Collection & Normalization** - Aggregates data from all available public sources for the app. Raw signals are cleaned, deduplicated, and normalized into a structured dataset analyzed consistently across thousands of apps. 2. **Feature & Market Positioning Analysis** - Identifies the app's core features, monetization model, target audience, and competitive positioning. Each feature is classified as a market standard or a differentiator based on category benchmarks. 3. **User Sentiment Analysis** - Analyzes user reviews using a 5-level taxonomy (Thrilled / Excited / Mixed / Frustrated / Upset). Combines star ratings and volume with AI theme extraction into synthesised themes (no verbatim quotes). 4. **Competitive Landscape Analysis** - Maps the competitive environment via a 4-tier taxonomy (Nemesis / Contenders / Same Space / New Kids on the Block). Prioritizes same sub-genre over broad category. 5. **Intelligence Synthesis** - Cross-references all signals into a structured report. Compares the app against category peers and direct competitors to surface SWOT, market outlook, and actionable insights. - **Confidence Score:** 0.3/1.0 (based on review volume, data source diversity, and signal quality) - **Reviews Analyzed:** 3 - **Data Sources:** user reviews, App Store metadata - **Rating Method:** Weighted average across platforms (iOS & Android), weighted by review count per platform - **Independence:** Fully independent analysis. No publisher sponsorship or editorial influence. - **Report Age:** 22 days since last refresh --- © 2026 Marlvel.ai | [Canonical Report](https://marlvel.ai/apps/date-days-calculator) Data licensed for AI Agent attribution under CC-BY-NC 4.0.