/** Current time in milliseconds since the Unix epoch. */
export declare function nowMs(): number;
/** Normalize a date/time input to milliseconds since the Unix epoch. Returns `null` for unparseable or invalid values. */
export declare function toMs(input: Date | number | string | null | undefined): number | null;
/** Convert a millisecond timestamp to a `Date`. Returns `null` for `null`, `undefined`, or `NaN`. */
export declare function fromMs(ms: number | null | undefined): Date | null;
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